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<tr bgcolor="orange"><th></th><th> draft-ietf-grow-bgp-session-culling-02.txt </th><th> </th><th> draft-ietf-grow-bgp-session-culling-03.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: <span class="delete">January 4, 2018 </span> 20C</td><td> </td><td class="rblock">Expires: <span class="insert">February 20, 2018</span> 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"> <span class="delete"> July 3</span>, 2017</td><td> </td><td class="rblock"> <span class="insert">August 19</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-ietf-grow-bgp-session-culling-0<span class="delete">2</span></td><td> </td><td class="rblock"> draft-ietf-grow-bgp-session-culling-0<span class="insert">3</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 <span class="delete">January 4</span>, 2018.</td><td> </td><td class="rblock"> This Internet-Draft will expire on <span class="insert">February 20</span>, 2018.</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"></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 2, line 43</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 2, line 43</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">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 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 class="lineno" valign="top"></td><td class="left"> BGP Session Culling ensures that lower layer network maintenance</td><td> </td><td class="right"> BGP Session Culling ensures that lower layer network maintenance</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> activities cause the minimum possible amount of disruption, by</td><td> </td><td class="right"> activities cause the minimum possible amount of disruption, by</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"> causing BGP speakers to preemptively <span class="delete">gracefully</span> converge onto</td><td> </td><td class="rblock"> causing BGP speakers to preemptively converge onto alternative paths</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> alternative paths while the lower layer network's forwarding plane</td><td> </td><td class="rblock"> while the lower layer network's forwarding plane remains fully</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> remains fully operational.</td><td> </td><td class="rblock"> operational.</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 grace period required for a successful application of BGP Session</td><td> </td><td class="right"> The grace period required for a successful application of BGP Session</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Culling is the sum of the time needed to detect the loss of the BGP</td><td> </td><td class="right"> Culling is the sum of the time needed to detect the loss of the BGP</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> session, plus the time required for the BGP speaker to converge onto</td><td> </td><td class="right"> session, plus the time required for the BGP speaker to converge onto</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"> alternative paths. The first value is governed by the BGP Hold Timer</td><td> </td><td class="rblock"> alternative paths. The first value is <span class="insert">often</span> governed by the BGP Hold</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> (section 6.5 of [RFC4271]), commonly between 90 and 180 <span class="delete">seconds,</span> The</td><td> </td><td class="rblock"> Timer (section 6.5 of [RFC4271]), commonly between 90 and 180</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> second value is implementation specific, but could be as much as 15</td><td> </td><td class="rblock"> <span class="insert">seconds.</span> The second value is implementation specific, but could be</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> minutes when a router with a slow control-plane is receiving a full</td><td> </td><td class="rblock"> as much as 15 minutes when a router with a slow control-plane is</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> set of Internet routes.</td><td> </td><td class="rblock"> receiving a full set of Internet routes.</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"> Throughout this document the "Caretaker" is defined to be the</td><td> </td><td class="right"> Throughout this document the "Caretaker" is defined to be the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> operator of the lower layer network, while "Operators" directly</td><td> </td><td class="right"> operator of the lower layer network, while "Operators" directly</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> administrate the BGP speakers. Operators and Caretakers implementing</td><td> </td><td class="right"> administrate the BGP speakers. Operators and Caretakers implementing</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> BGP Session Culling are encouraged to avoid using a fixed grace</td><td> </td><td class="right"> BGP Session Culling are encouraged to avoid using a fixed grace</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> period, but instead monitor forwarding plane activity while the</td><td> </td><td class="right"> period, but instead monitor forwarding plane activity while the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> culling is taking place and consider it complete once traffic levels</td><td> </td><td class="right"> culling is taking place and consider it complete once traffic levels</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> have dropped to a minimum (Section 3.3).</td><td> </td><td class="right"> have dropped to a minimum (Section 3.3).</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">2. Requirements Language</td><td> </td><td class="right">2. Requirements Language</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 key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td> </td><td class="right"> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td> </td><td class="right"> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> document are to be interpreted as described in RFC 2119 [RFC2119].</td><td> </td><td class="right"> document are to be interpreted as described in RFC 2119 [RFC2119].</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">3. BGP Session Culling</td><td> </td><td class="right">3. 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><a name="diff0007" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Voluntary BGP Session Teardown: The <span class="delete">o</span>perator initiates the tear down</td><td> </td><td class="rblock"> Voluntary BGP Session Teardown: The <span class="insert">O</span>perator 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><a name="diff0008" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Involuntary BGP Session Teardown: The <span class="delete">c</span>aretaker of the lower layer</td><td> </td><td class="rblock"> Involuntary BGP Session Teardown: The <span class="insert">C</span>aretaker 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 class="lineno" valign="top"></td><td class="left">3.1. Voluntary BGP Session Teardown Recommendations</td><td> </td><td class="right">3.1. 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><a name="diff0009" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Before an <span class="delete">o</span>perator commences activities which can cause disruption to</td><td> </td><td class="rblock"> Before an <span class="insert">O</span>perator commences activities which can cause disruption to</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the flow of data through the lower layer network, an operator can</td><td> </td><td class="right"> the flow of data through the lower layer network, an operator can</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"> reduce loss of traffic by issuing an <span class="delete">Administratively S</span>hutdown to all</td><td> </td><td class="rblock"> reduce loss of traffic by issuing an <span class="insert">administrative s</span>hutdown to all</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> BGP sessions running across the lower layer network and wait a few</td><td> </td><td class="right"> 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="left"> minutes for data-plane traffic to subside.</td><td> </td><td class="right"> 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 class="lineno" valign="top"></td><td class="left">3.1.1. Maintenance Considerations</td><td> </td><td class="right">3.1.1. Maintenance 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 <span class="delete">Administrative Shutdown could consider to use</span></td><td> </td><td class="rblock"> Initiators of the <span class="insert">administrative shutdown could consider using</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Graceful Shutdown [I-D.ietf-grow-bgp-gshut] to facilitate smooth</td><td> </td><td class="right"> Graceful Shutdown [I-D.ietf-grow-bgp-gshut] to facilitate smooth</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> drainage of traffic prior to session tear down, and the Shutdown</td><td> </td><td class="right"> drainage of traffic prior to session tear down, and the Shutdown</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Communication [I-D.ietf-idr-shutdown] to inform the remote side on</td><td> </td><td class="right"> Communication [I-D.ietf-idr-shutdown] to inform the remote side on</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> the nature and duration of the maintenance activities.</td><td> </td><td class="right"> the nature and 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 class="lineno" valign="top"></td><td class="left">3.2. Involuntary BGP Session Teardown Recommendations</td><td> </td><td class="right">3.2. 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" valign="top"></td><td class="left"> Internet performance.</td><td> </td><td class="right"> Internet performance.</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"> In the absence <span class="delete">of</span> notifications from the lower layer (e.g. ethernet</td><td> </td><td class="rblock"> In the absence notifications from the lower layer (e.g. ethernet link</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> link down) consistent with the planned maintenance activities in a</td><td> </td><td class="rblock"> down) consistent with the planned maintenance activities in a</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">densely meshed multi-node</span> layer-2 fabric, the <span class="delete">caretaker</span> of the fabric</td><td> </td><td class="rblock"> <span class="insert">switched</span> layer-2 fabric, the <span class="insert">Caretaker</span> of the fabric could <span class="insert">choose</span> to</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> could <span class="delete">opt</span> to cull BGP sessions on behalf of the <span class="delete">stakeholders</span></td><td> </td><td class="rblock"> cull BGP sessions on behalf of the <span class="insert">Operators</span> connected to the fabric.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> connected to the fabric.</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 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><a name="diff0013" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> the fabric's <span class="delete">c</span>aretaker.</td><td> </td><td class="rblock"> the fabric's <span class="insert">C</span>aretaker.</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 class="lineno" valign="top"></td><td class="left">3.2.1. Packet Filter Considerations</td><td> </td><td class="right">3.2.1. 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 class="lineno" valign="top"></td><td class="left"> The following considerations apply to the packet filter design:</td><td> </td><td class="right"> The following considerations apply to the packet filter design:</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 The packet filter MUST only affect BGP traffic specific to the</td><td> </td><td class="right"> o The packet filter MUST only affect BGP traffic specific to the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> layer-2 fabric, i.e. forming part of the control plane of the</td><td> </td><td class="right"> layer-2 fabric, 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="left"> system described, rather than multihop BGP traffic which merely</td><td> </td><td class="right"> system described, rather than multihop BGP traffic which merely</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> transits</td><td> </td><td class="right"> 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 class="lineno" valign="top"></td><td class="left"> o The packet filter MUST only affect BGP, i.e. TCP/179</td><td> </td><td class="right"> o The packet filter MUST 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 class="lineno" valign="top"></td><td class="left"> o The packet filter SHOULD make provision for the bidirectional</td><td> </td><td class="right"> o The packet filter SHOULD make provision for the bidirectional</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> nature of BGP, i.e. that sessions may be established in either</td><td> </td><td class="right"> 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="left"> direction</td><td> </td><td class="right"> 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="diff0014" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o The packet filter MUST affect all relevant <span class="delete">AFIs</span></td><td> </td><td class="rblock"> o The packet filter MUST affect all relevant <span class="insert">Address Family</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"> Identifiers.</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 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 class="lineno" valign="top"></td><td class="left">3.2.2. Hardware Considerations</td><td> </td><td class="right">3.2.2. 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><a name="diff0015" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Not all hardware is capable of deploying <span class="delete">layer</span> 3 / <span class="delete">layer</span> 4 filters on</td><td> </td><td class="rblock"> Not all hardware is capable of deploying <span class="insert">Layer</span> 3 / <span class="insert">Layer</span> 4 filters on</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">layer</span> 2 ports, and even on platforms which support <span class="delete">the</span> feature,</td><td> </td><td class="rblock"> <span class="insert">Layer</span> 2 ports, and even on platforms which <span class="insert">claim</span> support <span class="insert">for such a</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">documented</span> limitations may exist or hardware resource allocation</td><td> </td><td class="rblock"> feature, 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 class="lineno" valign="top"></td><td class="left"> unexpected results. These problems may include:</td><td> </td><td class="right"> unexpected results. 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 class="lineno" valign="top"></td><td class="left"> already have layer 2 filters applied</td><td> </td><td class="right"> 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 class="lineno" valign="top"></td><td class="left"> o Layer 3/4 filters supported for IPv4 but not for IPv6</td><td> </td><td class="right"> 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 class="lineno" valign="top"></td><td class="left"> Link Aggregate ports</td><td> </td><td class="right"> Link Aggregate ports</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-l4" /><small>skipping to change at</small><em> page 6, line 7</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 7</em></th><td></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 class="lineno" valign="top"></td><td class="left"> lossless ACL application</td><td> </td><td class="right"> 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 class="lineno" valign="top"></td><td class="left">3.3. Procedural Considerations</td><td> </td><td class="right">3.3. Procedural 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="diff0016" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">caretaker</span> of the lower layer can monitor data-plane traffic (e.g.</td><td> </td><td class="rblock"> The <span class="insert">Caretaker</span> of the lower layer <span class="insert">network</span> can monitor data-plane</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> interface counters) and carry out the maintenance without impact to</td><td> </td><td class="rblock"> traffic (e.g. interface counters) and carry out the maintenance</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> traffic once session culling is complete.</td><td> </td><td class="rblock"> without impact to 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 class="lineno" valign="top"></td><td class="left"> It is recommended that the packet filters are only deployed for the</td><td> </td><td class="right"> It is recommended that the packet filters are only deployed for the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> duration of the maintenance and immediately removed after the</td><td> </td><td class="right"> duration of the maintenance and immediately removed after the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> maintenance. To prevent unnecessarily troubleshooting, it is</td><td> </td><td class="right"> maintenance. To prevent unnecessarily troubleshooting, it is</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"> RECOMMENDED that <span class="delete">c</span>aretakers notify the affected operators before the</td><td> </td><td class="rblock"> RECOMMENDED that <span class="insert">C</span>aretakers notify the affected operators before the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> maintenance takes place, and make it explicit that the Involuntary</td><td> </td><td class="right"> maintenance takes place, and make it explicit that the Involuntary</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> BGP Session Culling methodology will be applied.</td><td> </td><td class="right"> BGP Session Culling methodology will be 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">4. Acknowledgments</td><td> </td><td class="right">4. 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 class="lineno" valign="top"></td><td class="left"> contributions to this document: Saku Ytti, Greg Hankins, James</td><td> </td><td class="right"> contributions to this document: Saku Ytti, Greg Hankins, James</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"> Bensley, Wolfgang Tremmel, Daniel Roesen, Bruno Decraene, <span class="delete">and</span> Tore</td><td> </td><td class="rblock"> Bensley, Wolfgang Tremmel, Daniel Roesen, Bruno Decraene, Tore</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Anderson.</span></td><td> </td><td class="rblock"> <span class="insert">Anderson and John Heasley.</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">5. Security Considerations</td><td> </td><td class="right">5. 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 class="lineno" valign="top"></td><td class="left">6. IANA Considerations</td><td> </td><td class="right">6. 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 class="lineno" valign="top"></td><td class="left">7. References</td><td> </td><td class="right">7. References</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-l5" /><small>skipping to change at</small><em> page 6, line 52</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 6, line 52</em></th><td></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 class="lineno" valign="top"></td><td class="left">7.2. Informative References</td><td> </td><td class="right">7.2. 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-grow-bgp-gshut]</td><td> </td><td class="right"> [I-D.ietf-grow-bgp-gshut]</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Francois, P., Decraene, B., Pelsser, C., Patel, K., and C.</td><td> </td><td class="right"> Francois, P., Decraene, B., Pelsser, C., Patel, K., and C.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Filsfils, "Graceful BGP session shutdown", draft-ietf-</td><td> </td><td class="right"> Filsfils, "Graceful BGP session shutdown", draft-ietf-</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"> grow-bgp-gshut-09 (work in progress), Ju<span class="delete">ne</span> 2017.</td><td> </td><td class="rblock"> grow-bgp-gshut-09 (work in progress), Ju<span class="insert">ly</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"> [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-10 (work in progress), June 2017.</td><td> </td><td class="right"> shutdown-10 (work in progress), June 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-05</td><td> </td><td class="right"> Independent Convergence", draft-ietf-rtgwg-bgp-pic-05</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> (work in progress), May 2017.</td><td> </td><td class="right"> (work in progress), May 2017.</td><td class="lineno" valign="top"></td></tr>
<tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
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