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<title>Diff: draft-iops-grow-bgp-session-culling-00.txt - draft-iops-grow-bgp-session-culling-01.txt</title>
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<tr bgcolor="orange"><th></th><th> draft-iops-grow-bgp-session-culling-00.txt </th><th> </th><th> draft-iops-grow-bgp-session-culling-01.txt </th><th></th></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Global Routing Operations W. Hargrave</td><td> </td><td class="right">Global Routing Operations W. Hargrave</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft LONAP</td><td> </td><td class="right">Internet-Draft LONAP</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Intended status: Best Current Practice M. Griswold</td><td> </td><td class="right">Intended status: Best Current Practice M. Griswold</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0001" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock">Expires: September <span class="delete">13</span>, 2017 20C</td><td> </td><td class="rblock">Expires: September <span class="insert">28</span>, 2017 20C</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> J. Snijders</td><td> </td><td class="right"> J. Snijders</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> NTT</td><td> </td><td class="right"> NTT</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> N. Hilliard</td><td> </td><td class="right"> N. Hilliard</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> INEX</td><td> </td><td class="right"> INEX</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0002" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> March <span class="delete">12</span>, 2017</td><td> </td><td class="rblock"> March <span class="insert">27</span>, 2017</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Mitigating Negative Impact of Maintenance through BGP Session Culling</td><td> </td><td class="right"> Mitigating Negative Impact of Maintenance through BGP Session Culling</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0003" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> draft-iops-grow-bgp-session-culling-0<span class="delete">0</span></td><td> </td><td class="rblock"> draft-iops-grow-bgp-session-culling-0<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> This document outlines an approach to mitigate negative impact on</td><td> </td><td class="right"> This document outlines an approach to mitigate negative impact on</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> networks resulting from maintenance activities. It includes guidance</td><td> </td><td class="right"> networks resulting from maintenance activities. It includes guidance</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> for both IP networks and Internet Exchange Points (IXPs). The</td><td> </td><td class="right"> for both IP networks and Internet Exchange Points (IXPs). The</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> approach is to ensure BGP-4 sessions affected by the maintenance are</td><td> </td><td class="right"> approach is to ensure BGP-4 sessions affected by the maintenance are</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> forcefully torn down before the actual maintenance activities</td><td> </td><td class="right"> forcefully torn down before the actual maintenance activities</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> commence.</td><td> </td><td class="right"> commence.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
<tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 40</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 1, line 40</em></th><td></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right"> Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Task Force (IETF). Note that other groups may also distribute</td><td> </td><td class="right"> Task Force (IETF). Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> working documents as Internet-Drafts. The list of current Internet-</td><td> </td><td class="right"> working documents as Internet-Drafts. The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right"> Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right"> Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right"> and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> time. It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right"> time. It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> material or to cite them other than as "work in progress."</td><td> </td><td class="right"> material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0004" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> This Internet-Draft will expire on September <span class="delete">13</span>, 2017.</td><td> </td><td class="rblock"> This Internet-Draft will expire on September <span class="insert">28</span>, 2017.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Copyright (c) 2017 IETF Trust and the persons identified as the</td><td> </td><td class="right"> Copyright (c) 2017 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> document authors. All rights reserved.</td><td> </td><td class="right"> document authors. All rights reserved.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> This document is subject to BCP 78 and the IETF Trust's Legal</td><td> </td><td class="right"> This document is subject to BCP 78 and the IETF Trust's Legal</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Provisions Relating to IETF Documents</td><td> </td><td class="right"> Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right"> (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> publication of this document. Please review these documents</td><td> </td><td class="right"> publication of this document. Please review these documents</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> carefully, as they describe your rights and restrictions with respect</td><td> </td><td class="right"> carefully, as they describe your rights and restrictions with respect</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> to this document. Code Components extracted from this document must</td><td> </td><td class="right"> to this document. Code Components extracted from this document must</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> include Simplified BSD License text as described in Section 4.e of</td><td> </td><td class="right"> include Simplified BSD License text as described in Section 4.e of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the Trust Legal Provisions and are provided without warranty as</td><td> </td><td class="right"> the Trust Legal Provisions and are provided without warranty as</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> described in the Simplified BSD License.</td><td> </td><td class="right"> described in the Simplified BSD License.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Table of Contents</td><td> </td><td class="right">Table of Contents</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2</td><td> </td><td class="right"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0005" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> 2. BGP Session Culling . . . . . . . . . . . . . . . . . . . . . 3</td><td> </td><td class="rblock"> 2. <span class="insert">Requirements Language . . . . . . . . . . . . . . . . . . . . 3</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">2.1.</span> Voluntary BGP Session Teardown Recommendations . . . . . 3</td><td> </td><td class="rblock"><span class="insert"> 3.</span> BGP Session Culling . . . . . . . . . . . . . . . . . . . . . 3</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">2.1.1.</span> Maintenance <span class="delete">Communication</span> Considerations . . . . . . <span class="delete">3</span></td><td> </td><td class="rblock"> <span class="insert">3.1.</span> Voluntary BGP Session Teardown Recommendations . . . . . 3</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2.2.</span> Involuntary BGP Session Teardown Recommendations . . . . <span class="delete">3</span></td><td> </td><td class="rblock"> <span class="insert">3.1.1.</span> Maintenance Considerations . . . . . . <span class="insert">. . . . . . . 4</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2.2.1.</span> Packet Filter Considerations . . . . . . . . . . . . 4</td><td> </td><td class="rblock"><span class="insert"> 3.2.</span> Involuntary BGP Session Teardown Recommendations . . . . <span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">2.2.2.</span> Hardware Considerations . . . . . . . . . . . . . . . <span class="delete">4</span></td><td> </td><td class="rblock"><span class="insert"> 3.2.1.</span> Packet Filter Considerations . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2.3. Monitoring</span> Considerations . . . . . . . . . . . . . . . . <span class="delete">5</span></td><td> </td><td class="rblock"> <span class="insert">3.2.2.</span> Hardware Considerations . . . . . . . . . . . . . . . <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 3.</span> Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">5</span></td><td> </td><td class="rblock"><span class="insert"> 3.3. Procedural</span> Considerations . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 4.</span> Security Considerations . . . . . . . . . . . . . . . . . . . <span class="delete">5</span></td><td> </td><td class="rblock"><span class="insert"> 4.</span> Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 5.</span> IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="delete">5</span></td><td> </td><td class="rblock"><span class="insert"> 5.</span> Security Considerations . . . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 6.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="rblock"><span class="insert"> 6.</span> IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">6.1.</span> Normative References . . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="rblock"><span class="insert"> 7.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">6.2.</span> Informative References . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="rblock"> <span class="insert">7.1.</span> Normative References . . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix A. Example packet filters . . . . . . . . . . . . . . . <span class="delete">6</span></td><td> </td><td class="rblock"> <span class="insert">7.2.</span> Informative References . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> A.1. <span class="delete">Juniper Junos Layer 2</span> Firewall Example Configuration . . <span class="delete">6</span></td><td> </td><td class="rblock"> Appendix A. Example packet filters . . . . . . . . . . . . . . . <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> A.2. <span class="delete">Arista EOS Firewall</span> Example Configuration . . . . . . . . <span class="delete">8</span></td><td> </td><td class="rblock"> A.1. <span class="insert">Cisco IOS, IOS XR & Arista EOS</span> Firewall Example</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Configuration . . <span class="insert">. . . . . . . . . . . . . . . . . . . . 7</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> A.2. <span class="insert">Nokia SR OS Filter</span> Example Configuration . . . . . . . . <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8</td><td> </td><td class="right"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">1. Introduction</td><td> </td><td class="right">1. Introduction</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0006" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">In network topologies where BGP speaking routers are directly</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> attached to each other, or use fault detection mechanisms such as BFD</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> [RFC5880], detecting and acting upon a link down event (for example</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> when someone yanks the physical connector) in a timely fashion is</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> straightforward.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> However, in topologies where upper layer fast fault detection</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> mechanisms are unavailable and the lower layer topology is hidden</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> from the BGP speakers, operators rely on BGP Hold Timer Expiration</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> (section 6.5 of [RFC4271]) to initiate traffic rerouting. Common BGP</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Hold Timer values are anywhere between 90 and 180 seconds, which</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> implies a window of 90 to 180 seconds during which traffic</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> blackholing will occur if the lower layer network is not able to</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> forward traffic.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> BGP Session Culling is the practice of ensuring BGP sessions are</td><td> </td><td class="right"> BGP Session Culling is the practice of ensuring BGP sessions are</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> forcefully torn down before maintenance activities on a lower layer</td><td> </td><td class="right"> forcefully torn down before maintenance activities on a lower layer</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> network commence, which otherwise would affect the flow of data</td><td> </td><td class="right"> network commence, which otherwise would affect the flow of data</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> between the BGP speakers.</td><td> </td><td class="right"> between the BGP speakers.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0007" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock">2. BGP Session Culling</td><td> </td><td class="rblock"> <span class="insert">BGP Session Culling ensures that lower layer network maintenance</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> activities cause the minimum possible amount of disruption, by</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> causing BGP speakers to preemptively gracefully converge onto</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> alternative paths while the lower layer network's forwarding plane</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> remains fully operational.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> The grace period required for a successful application of BGP Session</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Culling is the sum of the time needed to detect the loss of the BGP</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> session, plus the time required for the BGP speaker to converge onto</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> alternative paths. The first value is governed by the BGP Hold Timer</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> (section 6.5 of [RFC4271]), commonly between 90 and 180 seconds, The</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> second value is implementation specific, but could be as much as 15</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> minutes when a router with a slow control-plane is receiving a full</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> set of Internet routes.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Throughout this document the "Caretaker" is defined to be the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> operator of the lower layer network, while "Operators" directly</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> administrate the BGP speakers. Operators and Caretakers implementing</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> BGP Session Culling are encouraged to avoid using a fixed grace</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> period, but instead monitor forwarding plane activity while the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> culling is taking place and consider it complete once traffic levels</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> have dropped to a minimum (Section 3.3).</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">2. <span class="insert">Requirements Language</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> document are to be interpreted as described in RFC 2119 [RFC2119].</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">3.</span> BGP Session Culling</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> From the viewpoint of the IP network operator, there are two types of</td><td> </td><td class="right"> From the viewpoint of the IP network operator, there are two types of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> BGP Session Culling:</td><td> </td><td class="right"> BGP Session Culling:</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Voluntary BGP Session Teardown: The operator initiates the tear down</td><td> </td><td class="right"> Voluntary BGP Session Teardown: The operator initiates the tear down</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> of the potentially affected BGP session by issuing an</td><td> </td><td class="right"> of the potentially affected BGP session by issuing an</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Administrative Shutdown.</td><td> </td><td class="right"> Administrative Shutdown.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Involuntary BGP Session Teardown: The caretaker of the lower layer</td><td> </td><td class="right"> Involuntary BGP Session Teardown: The caretaker of the lower layer</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> network disrupts BGP control-plane traffic in the upper layer,</td><td> </td><td class="right"> network disrupts BGP control-plane traffic in the upper layer,</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> causing the BGP Hold Timers of the affected BGP session to expire,</td><td> </td><td class="right"> causing the BGP Hold Timers of the affected BGP session to expire,</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> subsequently triggering rerouting of end user traffic.</td><td> </td><td class="right"> subsequently triggering rerouting of end user traffic.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0008" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2</span>.1. Voluntary BGP Session Teardown Recommendations</td><td> </td><td class="rblock"><span class="insert">3</span>.1. Voluntary BGP Session Teardown Recommendations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Before an operator commences activities which can cause disruption to</td><td> </td><td class="right"> Before an operator commences activities which can cause disruption to</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0009" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> the flow of data through the lower layer network, an operator <span class="delete">would</span></td><td> </td><td class="rblock"> the flow of data through the lower layer network, an operator <span class="insert">can</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> do well to</span> Administratively Shutdown <span class="delete">the</span> BGP sessions running across</td><td> </td><td class="rblock"><span class="insert"> reduce loss of traffic by issuing an</span> Administratively Shutdown <span class="insert">to all</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> the lower layer network and wait a few minutes for data-plane traffic</td><td> </td><td class="rblock"> BGP sessions running across the lower layer network and wait a few</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> to subside.</td><td> </td><td class="rblock"> minutes for data-plane traffic to subside.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> While architectures exist to facilitate quick network reconvergence</td><td> </td><td class="right"> While architectures exist to facilitate quick network reconvergence</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> (such as BGP PIC [I-D.ietf-rtgwg-bgp-pic]), an operator cannot assume</td><td> </td><td class="right"> (such as BGP PIC [I-D.ietf-rtgwg-bgp-pic]), an operator cannot assume</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the remote side has such capabilities. As such, a grace period</td><td> </td><td class="right"> the remote side has such capabilities. As such, a grace period</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> between the Administrative Shutdown and the impacting maintenance</td><td> </td><td class="right"> between the Administrative Shutdown and the impacting maintenance</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> activities is warranted.</td><td> </td><td class="right"> activities is warranted.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> After the maintenance activities have concluded, the operator is</td><td> </td><td class="right"> After the maintenance activities have concluded, the operator is</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> expected to restore the BGP sessions to their original Administrative</td><td> </td><td class="right"> expected to restore the BGP sessions to their original Administrative</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> state.</td><td> </td><td class="right"> state.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0010" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2.1.1. Maintenance Communication</span> Considerations</td><td> </td><td class="rblock"><span class="insert">3.1.1. Maintenance</span> Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0011" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Initiators of the Administrative Shutdown <span class="delete">are encouraged</span> to use</td><td> </td><td class="rblock"> Initiators of the Administrative Shutdown <span class="insert">could consider</span> to use</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Shutdown Communication [I-D.ietf-idr-shutdown] to inform the remote</td><td> </td><td class="rblock"> <span class="insert">[Graceful Shutdown] to facilitate smooth drainage of traffic prior to</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> side on the nature and duration of the maintenance activities.</td><td> </td><td class="rblock"><span class="insert"> session tear down, and the</span> Shutdown Communication</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> [I-D.ietf-idr-shutdown] to inform the remote side on the nature and</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> duration of the maintenance activities.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0012" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2</span>.2. Involuntary BGP Session Teardown Recommendations</td><td> </td><td class="rblock"><span class="insert">3</span>.2. Involuntary BGP Session Teardown Recommendations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> In the case where multilateral interconnection between BGP speakers</td><td> </td><td class="right"> In the case where multilateral interconnection between BGP speakers</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> is facilitated through a switched layer-2 fabric, such as commonly</td><td> </td><td class="right"> is facilitated through a switched layer-2 fabric, such as commonly</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> seen at Internet Exchange Points (IXPs), different operational</td><td> </td><td class="right"> seen at Internet Exchange Points (IXPs), different operational</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> considerations can apply.</td><td> </td><td class="right"> considerations can apply.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Operational experience shows many network operators are unable to</td><td> </td><td class="right"> Operational experience shows many network operators are unable to</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> carry out the Voluntary BGP Session Teardown recommendations, because</td><td> </td><td class="right"> carry out the Voluntary BGP Session Teardown recommendations, because</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> of the operational cost and risk of co-ordinating the two</td><td> </td><td class="right"> of the operational cost and risk of co-ordinating the two</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> configuration changes required. This has an adverse affect on</td><td> </td><td class="right"> configuration changes required. This has an adverse affect on</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
<tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 4, line 26</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 4, line 45</em></th><td></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Such culling of control-plane traffic will pre-empt the loss of end-</td><td> </td><td class="right"> Such culling of control-plane traffic will pre-empt the loss of end-</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> user traffic, by causing the expiration of BGP Hold Timers ahead of</td><td> </td><td class="right"> user traffic, by causing the expiration of BGP Hold Timers ahead of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the moment where the expiration would occur without intervention from</td><td> </td><td class="right"> the moment where the expiration would occur without intervention from</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the fabric's caretaker.</td><td> </td><td class="right"> the fabric's caretaker.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> In this scenario, BGP Session Culling is accomplished through the</td><td> </td><td class="right"> In this scenario, BGP Session Culling is accomplished through the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> application of a combined layer-3 and layer-4 packet filter deployed</td><td> </td><td class="right"> application of a combined layer-3 and layer-4 packet filter deployed</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> in the switched fabric itself.</td><td> </td><td class="right"> in the switched fabric itself.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0013" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2</span>.2.1. Packet Filter Considerations</td><td> </td><td class="rblock"><span class="insert">3</span>.2.1. Packet Filter Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0014" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">packet filter should be designed and specified in a way that</span>:</td><td> </td><td class="rblock"> The <span class="insert">following considerations apply to the packet filter design</span>:</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0015" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o only affect <span class="delete">link-local</span> BGP traffic i.e. forming part of the</td><td> </td><td class="rblock"> o <span class="insert">The packet filter MUST</span> only affect BGP traffic <span class="insert">specific to the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> control plane of the system described, rather than multihop BGP</td><td> </td><td class="rblock"><span class="insert"> layer-2 fabric,</span> i.e. forming part of the control plane of the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> which merely transits</td><td> </td><td class="rblock"> system described, rather than multihop BGP <span class="insert">traffic</span> which merely</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> transits</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0016" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o only affect BGP, i.e. TCP/179</td><td> </td><td class="rblock"> o <span class="insert">The packet filter MUST </span>only affect BGP, i.e. TCP/179</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0017" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o make provision for the bidirectional nature of BGP, i.e. that</td><td> </td><td class="rblock"> o <span class="insert">The packet filter SHOULD</span> make provision for the bidirectional</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> sessions may be established in either direction</td><td> </td><td class="rblock"> nature of BGP, i.e. that sessions may be established in either</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> direction</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0018" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o affect all relevant AFIs</td><td> </td><td class="rblock"> o <span class="insert">The packet filter MUST </span>affect all relevant AFIs</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Appendix A contains examples of correct packet filters for various</td><td> </td><td class="right"> Appendix A contains examples of correct packet filters for various</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> platforms.</td><td> </td><td class="right"> platforms.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0019" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2</span>.2.2. Hardware Considerations</td><td> </td><td class="rblock"><span class="insert">3</span>.2.2. Hardware Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Not all hardware is capable of deploying layer 3 / layer 4 filters on</td><td> </td><td class="right"> Not all hardware is capable of deploying layer 3 / layer 4 filters on</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> layer 2 ports, and even on platforms which support the feature,</td><td> </td><td class="right"> layer 2 ports, and even on platforms which support the feature,</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> documented limitations may exist or hardware resource allocation</td><td> </td><td class="right"> documented limitations may exist or hardware resource allocation</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> failures may occur during filter deployment which may cause</td><td> </td><td class="right"> failures may occur during filter deployment which may cause</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0020" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> unexpected result. These problems may include:</td><td> </td><td class="rblock"> unexpected result<span class="insert">s</span>. These problems may include:</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Platform inability to apply layer 3/4 filters on ports which</td><td> </td><td class="right"> o Platform inability to apply layer 3/4 filters on ports which</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0021" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> already have layer 2 filters applied<span class="delete">.</span></td><td> </td><td class="rblock"> already have layer 2 filters applied</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0022" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o Layer 3/4 filters supported for IPv4 but not for IPv6<span class="delete">.</span></td><td> </td><td class="rblock"> o Layer 3/4 filters supported for IPv4 but not for IPv6</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Layer 3/4 filters supported on physical ports, but not on 802.3ad</td><td> </td><td class="right"> o Layer 3/4 filters supported on physical ports, but not on 802.3ad</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0023" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Link Aggregate ports<span class="delete">.</span></td><td> </td><td class="rblock"> Link Aggregate ports</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Failure of the operator to apply filters to all 802.3ad Link</td><td> </td><td class="right"> o Failure of the operator to apply filters to all 802.3ad Link</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Aggregate ports</td><td> </td><td class="right"> Aggregate ports</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Limitations in ACL hardware mechanisms causing filters not to be</td><td> </td><td class="right"> o Limitations in ACL hardware mechanisms causing filters not to be</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0024" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> applied<span class="delete">.</span></td><td> </td><td class="rblock"> applied</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Fragmentation of ACL lookup memory causing transient ACL</td><td> </td><td class="right"> o Fragmentation of ACL lookup memory causing transient ACL</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> application problems which are resolved after ACL removal /</td><td> </td><td class="right"> application problems which are resolved after ACL removal /</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0025" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> reapplication<span class="delete">.</span></td><td> </td><td class="rblock"> reapplication</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Temporary service loss during hardware programming</td><td> </td><td class="right"> o Temporary service loss during hardware programming</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Reduction in hardware ACL capacity if the platform enables</td><td> </td><td class="right"> o Reduction in hardware ACL capacity if the platform enables</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0026" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> lossless ACL application<span class="delete">.</span></td><td> </td><td class="rblock"> lossless ACL application</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> It is advisable for the operator to be aware of the limitations of</td><td> </td><td class="right"> It is advisable for the operator to be aware of the limitations of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> their hardware, and to thoroughly test all complicated configurations</td><td> </td><td class="right"> their hardware, and to thoroughly test all complicated configurations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> in advance to ensure that problems don't occur during production</td><td> </td><td class="right"> in advance to ensure that problems don't occur during production</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> deployments.</td><td> </td><td class="right"> deployments.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0027" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2.3. Monitoring</span> Considerations</td><td> </td><td class="rblock"><span class="insert">3.3. Procedural</span> Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> The caretaker of the lower layer can monitor data-plane traffic (e.g.</td><td> </td><td class="right"> The caretaker of the lower layer can monitor data-plane traffic (e.g.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> interface counters) and carry out the maintenance without impact to</td><td> </td><td class="right"> interface counters) and carry out the maintenance without impact to</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> traffic once session culling is complete.</td><td> </td><td class="right"> traffic once session culling is complete.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0028" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">3.</span> Acknowledgments</td><td> </td><td class="rblock"> <span class="insert">It is recommended that the packet filters are only deployed for the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> duration of the maintenance and immediately removed after the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> maintenance. To prevent unnecessarily troubleshooting, it is</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> RECOMMENDED that caretakers notify the affected operators before the</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> maintenance takes place, and make it explicit that the Involuntary</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> BGP Session Culling methodology will be applied.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">4.</span> Acknowledgments</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> The authors would like to thank the following people for their</td><td> </td><td class="right"> The authors would like to thank the following people for their</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0029" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> contributions to this document: Saku <span class="delete">Ytti.</span></td><td> </td><td class="rblock"> contributions to this document: Saku <span class="insert">Ytti, Greg Hankins, James</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Bensley, Wolfgang Tremmel, Daniel Roesen, Bruno Decraene, and Tore</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Anderson.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0030" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">4</span>. Security Considerations</td><td> </td><td class="rblock"><span class="insert">5</span>. Security Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> There are no security considerations.</td><td> </td><td class="right"> There are no security considerations.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0031" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">5</span>. IANA Considerations</td><td> </td><td class="rblock"><span class="insert">6</span>. IANA Considerations</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> This document has no actions for IANA.</td><td> </td><td class="right"> This document has no actions for IANA.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0032" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>. References</td><td> </td><td class="rblock"><span class="insert">7</span>. References</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0033" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6.1.</span> Normative References</td><td> </td><td class="rblock"><span class="insert">7.1.</span> Normative References</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> <span class="insert">[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Requirement Levels", BCP 14, RFC 2119,</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> DOI 10.17487/RFC2119, March 1997,</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> <http://www.rfc-editor.org/info/rfc2119>.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A</td><td> </td><td class="right"> [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Border Gateway Protocol 4 (BGP-4)", RFC 4271,</td><td> </td><td class="right"> Border Gateway Protocol 4 (BGP-4)", RFC 4271,</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> DOI 10.17487/RFC4271, January 2006,</td><td> </td><td class="right"> DOI 10.17487/RFC4271, January 2006,</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> <http://www.rfc-editor.org/info/rfc4271>.</td><td> </td><td class="right"> <http://www.rfc-editor.org/info/rfc4271>.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0034" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.2. Informative References</td><td> </td><td class="rblock"><span class="insert">7</span>.2. Informative References</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> [I-D.ietf-idr-shutdown]</td><td> </td><td class="right"> [I-D.ietf-idr-shutdown]</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Snijders, J., Heitz, J., and J. Scudder, "BGP</td><td> </td><td class="right"> Snijders, J., Heitz, J., and J. Scudder, "BGP</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Administrative Shutdown Communication", draft-ietf-idr-</td><td> </td><td class="right"> Administrative Shutdown Communication", draft-ietf-idr-</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> shutdown-07 (work in progress), March 2017.</td><td> </td><td class="right"> shutdown-07 (work in progress), March 2017.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> [I-D.ietf-rtgwg-bgp-pic]</td><td> </td><td class="right"> [I-D.ietf-rtgwg-bgp-pic]</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Bashandy, A., Filsfils, C., and P. Mohapatra, "BGP Prefix</td><td> </td><td class="right"> Bashandy, A., Filsfils, C., and P. Mohapatra, "BGP Prefix</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Independent Convergence", draft-ietf-rtgwg-bgp-pic-01</td><td> </td><td class="right"> Independent Convergence", draft-ietf-rtgwg-bgp-pic-01</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> (work in progress), June 2016.</td><td> </td><td class="right"> (work in progress), June 2016.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0035" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">[RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection</span></td><td> </td><td class="rblock"><span class="insert">7.3. URIs</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010,</span></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> <http://www.rfc-editor.org/info/rfc5880>.</span></td><td> </td><td class="rblock"><span class="insert"> [1] https://github.com/bgp/bgp-session-culling-config-examples</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Appendix A. Example packet filters</td><td> </td><td class="right">Appendix A. Example packet filters</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Example packet filters for "Involuntary BGP Session Teardown" at an</td><td> </td><td class="right"> Example packet filters for "Involuntary BGP Session Teardown" at an</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> IXP with LAN prefixes 192.0.2.0/24 and 2001:db8:2::/64.</td><td> </td><td class="right"> IXP with LAN prefixes 192.0.2.0/24 and 2001:db8:2::/64.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0036" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">A.1. Juniper Junos Layer 2 Firewall Example Configuration</span></td><td> </td><td class="rblock"> <span class="insert">A repository of</span> configuration <span class="insert">examples for a number of assorted</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"><span class="insert"> platforms can be found at github.com/bgp/bgp-session-culling-config-</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> > show</span> configuration <span class="delete">firewall family ethernet-switching filter cull</span></td><td> </td><td class="rblock"><span class="insert"> examples [1].</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> term towards_peeringlan-v4 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> from {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-version {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ipv4 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> destination-port bgp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-source-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 192.0.2.0/24;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-destination-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 192.0.2.0/24;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-protocol tcp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> then discard;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> term from_peeringlan-v4 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> from {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-version {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ipv4 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> source-port bgp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-source-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 192.0.2.0/24;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-destination-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 192.0.2.0/24;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-protocol tcp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> then discard;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> term towards_peeringlan-v6 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> from {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-version {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ipv6 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> next-header tcp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> destination-port bgp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip6-source-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2001:db8:2::/64;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip6-destination-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2001:db8:2::/64;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> then discard;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> term from_peeringlan-v6 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> from {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip-version {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ipv6 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> next-header tcp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> source-port bgp;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip6-source-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2001:db8:2::/64;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> ip6-destination-address {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2001:db8:2::/64;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> then discard;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> term rest {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> then accept;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> > show configuration interfaces xe-0/0/46</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> description "IXP participant affected by maintenance"</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> unit 0 {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> family ethernet-switching {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> filter {</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> input cull;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> }</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0037" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock">A.<span class="delete">2. </span> Arista EOS Firewall Example Configuration</td><td> </td><td class="rblock">A.<span class="insert">1. Cisco IOS, IOS XR &</span> Arista EOS Firewall Example Configuration</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> ipv6 access-list acl-ipv6-permit-all-except-bgp</td><td> </td><td class="right"> ipv6 access-list acl-ipv6-permit-all-except-bgp</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 10 deny tcp 2001:db8:2::/64 eq bgp 2001:db8:2::/64</td><td> </td><td class="right"> 10 deny tcp 2001:db8:2::/64 eq bgp 2001:db8:2::/64</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 20 deny tcp 2001:db8:2::/64 2001:db8:2::/64 eq bgp</td><td> </td><td class="right"> 20 deny tcp 2001:db8:2::/64 2001:db8:2::/64 eq bgp</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 30 permit ipv6 any any</td><td> </td><td class="right"> 30 permit ipv6 any any</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> !</td><td> </td><td class="right"> !</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> ip access-list acl-ipv4-permit-all-except-bgp</td><td> </td><td class="right"> ip access-list acl-ipv4-permit-all-except-bgp</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 10 deny tcp 192.0.2.0/24 eq bgp 192.0.2.0/24</td><td> </td><td class="right"> 10 deny tcp 192.0.2.0/24 eq bgp 192.0.2.0/24</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 20 deny tcp 192.0.2.0/24 192.0.2.0/24 eq bgp</td><td> </td><td class="right"> 20 deny tcp 192.0.2.0/24 192.0.2.0/24 eq bgp</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 30 permit ip any any</td><td> </td><td class="right"> 30 permit ip any any</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> !</td><td> </td><td class="right"> !</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> interface Ethernet33</td><td> </td><td class="right"> interface Ethernet33</td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0038" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> description IXP <span class="delete">participant affected by m</span>aintenance</td><td> </td><td class="rblock"> description IXP <span class="insert">Participant Affected by M</span>aintenance</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> ip access-group acl-ipv4-permit-all-except-bgp in</td><td> </td><td class="right"> ip access-group acl-ipv4-permit-all-except-bgp in</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> ipv6 access-group acl-ipv6-permit-all-except-bgp in</td><td> </td><td class="right"> ipv6 access-group acl-ipv6-permit-all-except-bgp in</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> !</td><td> </td><td class="right"> !</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td><a name="diff0039" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">A.2. Nokia SR OS Filter Example Configuration</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> ip-filter 10 create</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> filter-name "ACL IPv4 Permit All Except BGP"</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> default-action forward</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> entry 10 create</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> match protocol tcp</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> dst-ip 192.0.2.0/24</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> src-ip 192.0.2.0/24</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> port eq 179</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> action</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> drop</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> ipv6-filter 10 create</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> filter-name "ACL IPv6 Permit All Except BGP"</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> default-action forward</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> entry 10 create</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> match next-header tcp</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> dst-ip 2001:db8:2::/64</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> src-ip 2001:db8:2::/64</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> port eq 179</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> action</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> drop</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> interface "port-1/1/1"</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> description "IXP Participant Affected by Maintenance"</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> ingress</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> filter ip 10</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> filter ipv6 10</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> exit</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">Authors' Addresses</td><td> </td><td class="right">Authors' Addresses</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Will Hargrave</td><td> </td><td class="right"> Will Hargrave</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> LONAP Ltd</td><td> </td><td class="right"> LONAP Ltd</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 5 Fleet Place</td><td> </td><td class="right"> 5 Fleet Place</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> London EC4M 7RD</td><td> </td><td class="right"> London EC4M 7RD</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> United Kingdom</td><td> </td><td class="right"> United Kingdom</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Email: will@lonap.net</td><td> </td><td class="right"> Email: will@lonap.net</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Matt Griswold</td><td> </td><td class="right"> Matt Griswold</td><td class="lineno" valign="top"></td></tr>
<tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
<tr bgcolor="gray"><th colspan="5" align="center"><a name="end"> End of changes. 39 change blocks. </a></th></tr>
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