--- 1/draft-ietf-grow-bgp-gshut-05.txt 2014-08-14 06:14:38.325846743 -0700 +++ 2/draft-ietf-grow-bgp-gshut-06.txt 2014-08-14 06:14:38.353847425 -0700 @@ -1,24 +1,24 @@ Network Working Group Pierre Francois Internet-Draft Institute IMDEA Networks Intended status: Informational Bruno Decraene -Expires: August 1, 2014 Orange +Expires: February 15, 2015 Orange Cristel Pelsser Internet Initiative Japan Keyur Patel Clarence Filsfils Cisco Systems - January 28, 2014 + August 14, 2014 Graceful BGP session shutdown - draft-ietf-grow-bgp-gshut-05 + draft-ietf-grow-bgp-gshut-06 Abstract This draft describes operational procedures aimed at reducing the amount of traffic lost during planned maintenances of routers or links, involving the shutdown of BGP peering sessions. Status of this Memo This Internet-Draft is submitted in full conformance with the @@ -27,21 +27,21 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." - This Internet-Draft will expire on August 1, 2014. + This Internet-Draft will expire on February 15, 2015. Copyright Notice Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents @@ -76,24 +76,26 @@ 4.2.3. Router g-shut . . . . . . . . . . . . . . . . . . . . 7 5. Forwarding modes and transient forwarding loops during convergence . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. Link Up cases . . . . . . . . . . . . . . . . . . . . . . . . 8 6.1. Unreachability local to the ASBR . . . . . . . . . . . . . 8 6.2. iBGP convergence . . . . . . . . . . . . . . . . . . . . . 9 7. IANA assigned g-shut BGP community . . . . . . . . . . . . . . 9 8. Security Considerations . . . . . . . . . . . . . . . . . . . 10 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10 + 10.1. Normative References . . . . . . . . . . . . . . . . . . . 10 + 10.2. Informative References . . . . . . . . . . . . . . . . . . 11 Appendix A. Alternative techniques with limited applicability . . 11 A.1. Multi Exit Discriminator tweaking . . . . . . . . . . . . 11 A.2. IGP distance Poisoning . . . . . . . . . . . . . . . . . . 11 - Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11 + Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12 1. Introduction Routing changes in BGP can be caused by planned, maintenance operations. This document discusses operational procedures to be applied in order to reduce or eliminate losses of packets during the maintenance. These losses come from the transient lack of reachability during the BGP convergence following the shutdown of an eBGP peering session between two Autonomous System Border Routers (ASBR). @@ -394,47 +396,51 @@ transitive extended community do not need to do this as the community is non transitive and hence cannot be used by remote ASes. 9. Acknowledgments The authors wish to thank Olivier Bonaventure and Pradosh Mohapatra for their useful comments on this work. 10. References - [AddPath] D. Walton, E. Chen, A. Retana, and J. Scudder, - "Advertisement of Multiple Paths in BGP", - draft-ietf-idr-add-paths-09.txt (work in progress). - - [BestExternal] - Marques, P., Fernando, R., Chen, E., Mohapatra, P., and H. - Gredler, "Advertisement of the best-external route to - IBGP", draft-ietf-idr-best-external-05.txt. +10.1. Normative References [REQS] Decraene, B., Francois, P., Pelsser, C., Ahmad, Z., Armengol, A., and T. Takeda, "Requirements for the graceful shutdown of BGP sessions", RFC 6198. - [RFC4360] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended - Communities Attribute", RFC 4360, February 2006. - [EXT_POOL] Decraene, B. and P. Francois, "Assigned BGP extended communities", draft-ietf-idr-reserved-extended-communities-06. + [RFC4360] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended + Communities Attribute", RFC 4360, February 2006. + [BGPWKC] "http://www.iana.org/assignments/ bgp-well-known-communities". [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. +10.2. Informative References + + [AddPath] D. Walton, E. Chen, A. Retana, and J. Scudder, + "Advertisement of Multiple Paths in BGP", + draft-ietf-idr-add-paths-09.txt (work in progress). + + [BestExternal] + Marques, P., Fernando, R., Chen, E., Mohapatra, P., and H. + Gredler, "Advertisement of the best-external route to + IBGP", draft-ietf-idr-best-external-05.txt. + Appendix A. Alternative techniques with limited applicability A few alternative techniques have been considered to provide g-shut capabilities but have been rejected due to their limited applicability. This section describe them for possible reference. A.1. Multi Exit Discriminator tweaking The MED attribute of the paths to be avoided can be increased so as to force the routers in the neighboring AS to select other paths.