Protocol Independent Multicast Equal-Cost Multipath Redirect
RFC 6754, “Protocol Independent Multicast Equal-Cost Multipath Redirect”, is a Proposed Standard document published in October 2012 by Y. Cai, L. Wei, H. Ou, V. Arya, S. Jethwani. It has since been updated by RFC 8736, RFC 9436. The canonical text is published by the RFC Editor.
Abstract
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]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 6754 is hosted at rfc-editor.org. Available in TXT,HTML.
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