A new Request for Comments is now available in online RFC libraries.
RFC 7311
Title: The Accumulated IGP Metric Attribute
for BGP
Author: P. Mohapatra, R. Fernando,
E. Rosen, J. Uttaro
Status: Standards Track
Stream: IETF
Date: August 2014
Mailbox: mpradosh@yahoo.com,
rex@cisco.com,
erosen@cisco.com,
uttaro@att.com
Pages: 15
Characters: 32615
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-idr-aigp-18.txt
URL: https://www.rfc-editor.org/rfc/rfc7311.txt
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
through the use of a metric. It is generally recognized that any
attempt to do so would incur significant scalability problems as
well as inter-administration coordination problems. However, there
are deployments in which a single administration runs several
contiguous BGP networks. In such cases, it can be desirable, within
that single administrative domain, for BGP to select paths based on a
metric, just as an IGP would do. The purpose of this document is to
provide a specification for doing so.
This document is a product of the Inter-Domain Routing Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements. Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol. Distribution of this memo is unlimited.
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