The IESG has received a request from the Protocol Independent Multicast WG (pim) to consider the following document: - 'Protocol Independent Multicast ECMP Redirect' <draft-ietf-pim-ecmp-03.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2012-06-12. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract A Protocol Independent Multicast (PIM) [RFC4601] router uses the Reverse Path Forwarding (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 Redirect, 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. The file can be obtained via http://datatracker.ietf.org/doc/draft-ietf-pim-ecmp/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-ietf-pim-ecmp/ballot/ The following IPR Declarations may be related to this I-D: http://datatracker.ietf.org/ipr/1780/
