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RFC 6754
Title: Protocol Independent Multicast
Equal-Cost Multipath (ECMP) Redirect
Author: Y. Cai, L. Wei, H. Ou,
V. Arya, S. Jethwani
Status: Standards Track
Stream: IETF
Date: October 2012
Mailbox: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Pages: 12
Characters: 24599
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-pim-ecmp-05.txt
URL: http://www.rfc-editor.org/rfc/rfc6754.txt
A Protocol Independent Multicast (PIM) router uses the Reverse Path
Forwarding (RPF) procedure to select an upstream interface and router
in order to build forwarding state. When there are equal cost
multipaths (ECMPs), existing implementations often use hash
algorithms to select a path. Such algorithms do not allow the spread
of traffic among the ECMPs according to administrative metrics. This
usually leads to inefficient or ineffective use of network resources.
This document introduces the ECMP Redirect, a mechanism to improve
the RPF procedure over ECMPs. It allows ECMP selection to be based
on administratively selected metrics, such as data transmission
delays, path preferences, and routing metrics. [STANDARDS-TRACK]
This document is a product of the Protocol Independent Multicast Working Group
of the IETF.
This is now a Proposed Standard Protocol.
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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