PIM Assert Message Packing

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Authors Yisong Liu  , Mike McBride  , Toerless Eckert 
Last updated 2019-12-21 (latest revision 2019-06-19)
Replaced by draft-ietf-pim-assert-packing
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In PIM-SM shared LAN networks, there is typically more than one upstream router. When duplicate data packets appear on the LAN from different routers, assert packets are sent from these routers to elect a single forwarder. The PIM assert packets are sent periodically to keep the assert state. The PIM assert packet carries information about a single multicast source and group, along with the metric-preference and metric of the route towards the source or RP. This document defines a standard to send and receive multiple multicast source and group information in a single PIM assert packet in a shared network. This can be particularly helpful when there is traffic for a large number of multicast groups.


Yisong Liu (liuyisong@huawei.com)
Mike McBride (michael.mcbride@futurewei.com)
Toerless Eckert (tte+ietf@cs.fau.de)

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