Hi, This draft provides an overview of BGP prefix independent convergence and how it is possible to achieve sub-second and, for certain local failures, sub-50msec convergence using hierarchical and shared FIB chain design
The basic idea relies on constructing the forwarding chains such that the BGP pathlists are shared among the maximum possible number of BGP prefixes. At the same time, BGP pathlists act as dependents on IGP prefixes in a hierarchy that allows modifying IGP without impacting BGP. The draft will be presented in the RTGWG meeting next week All comments and suggestions are most welcomed Thanks Ahmed -------- Original Message -------- Subject: New Version Notification for draft-rtgwg-bgp-pic-00.txt Date: Mon, 1 Oct 2012 07:08:39 -0700 From: <[email protected]> To: <[email protected]> CC: <[email protected]>, <[email protected]> A new version of I-D, draft-rtgwg-bgp-pic-00.txt has been successfully submitted by Ahmed Bashandy and posted to the IETF repository. Filename: draft-rtgwg-bgp-pic Revision: 00 Title: Abstract Creation date: 2012-09-28 WG ID: Individual Submission Number of pages: 19 URL: http://www.ietf.org/internet-drafts/draft-rtgwg-bgp-pic-00.txt Status: http://datatracker.ietf.org/doc/draft-rtgwg-bgp-pic Htmlized: http://tools.ietf.org/html/draft-rtgwg-bgp-pic-00 Abstract: In the network comprising thousands of iBGP peers exchanging millions of routes, many routes are reachable via more than one path. Given the large scaling targets, it is desirable to restore traffic after failure in a time period that does not depend on the number of BGP prefixes. In this document we proposed a technique by which traffic can be re-routed to ECMP or pre-calculated backup paths in a timeframe that does not depend on the number of BGP prefixes. The objective is achieved through organizing the forwarding chains in a hierarchical manner and sharing forwarding elements among the maximum possible number of routes. The proposed technique achieves prefix independent convergence while ensuring incremental deployment, complete transparency and automation, and zero management and provisioning effort The IETF Secretariat
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