--- 1/draft-ietf-idr-aigp-16.txt 2014-04-08 07:14:40.725702007 -0700 +++ 2/draft-ietf-idr-aigp-17.txt 2014-04-08 07:14:40.757702790 -0700 @@ -1,26 +1,26 @@ Network Working Group Pradosh Mohapatra Internet Draft Cumulus Networks Intended Status: Proposed Standard -Expires: September 25, 2014 Rex Fernando +Expires: October 8, 2014 Rex Fernando Eric C. Rosen Cisco Systems, Inc. James Uttaro ATT - March 25, 2014 + April 8, 2014 The Accumulated IGP Metric Attribute for BGP - draft-ietf-idr-aigp-16.txt + draft-ietf-idr-aigp-17.txt Abstract Routing protocols that have been designed to run within a single administrative domain ("IGPs") generally do so by assigning a metric to each link, and then choosing as the installed path between two nodes the path for which the total distance (sum of the metric of each link along the path) is minimized. BGP, designed to provide routing over a large number of independent administrative domains ("autonomous systems"), does not make its path selection decisions @@ -263,21 +263,21 @@ 3.3. Restrictions on Sending/Receiving An implementation that supports the AIGP attribute MUST support a per-session configuration item, AIGP_SESSION, that indicates whether the attribute is enabled or disabled for use on that session. - The default value of AIGP_SESSION, for EBGP sessions, MUST be "disabled". - The default value of AIGP_SESSION, for IBGP and confederation- - EBGP sessions, SHOULD be "enabled." + EBGP [BGP-CONFED] sessions, SHOULD be "enabled." The AIGP attribute MUST NOT be sent on any BGP session for which AIGP_SESSION is disabled. If an AIGP attribute is received on a BGP session for which AIGP_SESSION is disabled, the attribute MUST be treated exactly as if it were an unrecognized non-transitive attribute. That is, "it MUST be quietly ignored and not passed along to other BGP peers" (see [BGP], section 5). However, the fact that the attribute was received SHOULD be logged (in a rate-limited manner). @@ -629,19 +629,22 @@ 11. Informative References [ADD-PATH] "Advertisement of Multiple Paths in BGP", D. Walton, A. Retana, E. Chen, J. Scudder, draft-ietf-idr-add-paths-09.txt, October 2013. [BESTEXT], "Advertisement of the Best External Route in BGP", P. Marques, R. Fernando, E. Chen, P. Mohapatra, H. Gredler, draft-ietf- idr-best-external-05.txt, January 2012. + [BGP-CONFED] "Autonomous System Confederations for BGP", P. Traina, + D. McPherson, J. Scudder, RFC 5065, August 2007 + [BGP-ERROR] "Revised Error Handling for BGP UPDATE Messages", J. Scudder, E. Chen, P. Mohapatra, K. Patel, draft-ietf-idr-error- handling-06.txt, February 2014. [LDP-IGP-SYNC] "LDP IGP Synchronization", M. Jork, A. Atlas, L. Fang, RFC 5443, March 2009. [RFC2119] "Key words for use in RFCs to Indicate Requirement Levels.", S. Bradner, March 1997.