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<tr bgcolor="orange"><th></th><th> draft-ietf-grow-bgp-session-culling-03.txt </th><th> </th><th> draft-ietf-grow-bgp-session-culling-04.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">February 20, 2018</span> 20C</td><td> </td><td class="rblock">Expires: <span class="insert">March 15, 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"> August 19</span>, 2017</td><td> </td><td class="rblock"> <span class="insert">September 11</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">3</span></td><td> </td><td class="rblock"> draft-ietf-grow-bgp-session-culling-0<span class="insert">4</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">February 20</span>, 2018.</td><td> </td><td class="rblock"> This Internet-Draft will expire on <span class="insert">March 15</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 3, line 32</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 3, line 32</em></th><td></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 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><a name="diff0005" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> network disrupts BGP control-plane <span class="delete">traffic in the upper layer,</span></td><td> </td><td class="rblock"> network disrupts <span class="insert">(higher layer)</span> BGP control-plane <span class="insert">traffic,</span> causing</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> causing the BGP Hold Timers of the affected BGP session to expire,</td><td> </td><td class="rblock"> 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 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 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 class="lineno" valign="top"></td><td class="left"> reduce loss of traffic by issuing an administrative shutdown to all</td><td> </td><td class="right"> reduce loss of traffic by issuing an administrative shutdown 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"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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<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 class="lineno" valign="top"></td><td class="left"> In the absence notifications from the lower layer (e.g. ethernet link</td><td> </td><td class="right"> 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="left"> down) consistent with the planned maintenance activities in a</td><td> </td><td class="right"> 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="left"> switched layer-2 fabric, the Caretaker of the fabric could choose to</td><td> </td><td class="right"> switched layer-2 fabric, the Caretaker of the fabric could choose to</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> cull BGP sessions on behalf of the Operators connected to the fabric.</td><td> </td><td class="right"> cull BGP sessions on behalf of the Operators connected to the fabric.</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"> Such culling of control-plane traffic will pre<span class="delete">-</span>empt the loss of end-</td><td> </td><td class="rblock"> Such culling of control-plane traffic will preempt 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 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"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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<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 class="lineno" valign="top"></td><td class="left"> RECOMMENDED that Caretakers notify the affected operators before the</td><td> </td><td class="right"> RECOMMENDED that Caretakers 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 class="lineno" valign="top"></td><td class="left"> Bensley, Wolfgang Tremmel, Daniel Roesen, Bruno Decraene, Tore</td><td> </td><td class="right"> Bensley, Wolfgang Tremmel, Daniel Roesen, Bruno Decraene, Tore</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"> Anderson<span class="delete"> and John Heasley</span>.</td><td> </td><td class="rblock"> Anderson<span class="insert">, John Heasley and Warren Kumari</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" 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">7.1. Normative References</td><td> </td><td class="right">7.1. Normative 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"> [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate</td><td> </td><td class="right"> [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Requirement Levels", BCP 14, RFC 2119,</td><td> </td><td class="right"> Requirement Levels", BCP 14, RFC 2119,</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"> DOI 10.17487/RFC2119, March 1997,</td><td> </td><td class="rblock"> DOI 10.17487/RFC2119, March 1997, <span class="insert"><https://www.rfc-</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/rfc2119>.</span></td><td> </td><td class="rblock"><span class="insert"> 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><a name="diff0009" /></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> DOI 10.17487/RFC4271, January 2006,</td><td> </td><td class="rblock"> DOI 10.17487/RFC4271, January 2006, <span class="insert"><https://www.rfc-</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/rfc4271>.</span></td><td> </td><td class="rblock"><span class="insert"> editor.org/info/rfc4271>.</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">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 class="lineno" valign="top"></td><td class="left"> grow-bgp-gshut-09 (work in progress), July 2017.</td><td> </td><td class="right"> grow-bgp-gshut-09 (work in progress), July 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>
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