Protocol Independent Multicast ECMP Assert

Document Type Replaced Internet-Draft (individual)
Authors Vishal Arya  , Yiqun Cai  , Liming Wei  , Sunil Jethwani  , Heidi Ou 
Last updated 2011-11-09 (latest revision 2011-07-08)
Replaced by RFC 6754
Stream (None)
Intended RFC status (None)
Expired & archived
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Stream Stream state (No stream defined)
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IESG IESG state Replaced by draft-ietf-pim-ecmp
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


A PIM router uses RPF procedure to select an upstream interface and router to build forwarding state. When there are equal cost multiple paths (ECMP), 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 Assert, a mechanism to improve the RPF procedure over ECMPs. It allows ECMP path selection to be based on administratively selected metrics, such as data transmission delays, path preferences and routing metrics.


Vishal Arya (
Yiqun Cai (
Liming Wei (
Sunil Jethwani (
Heidi Ou (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)