Protocol Independent Multicast DR Load Balancing

The information below is for an old version of the document
Document Type Expired Internet-Draft (pim WG)
Authors Yiqun Cai  , Sri Vallepalli  , Heidi Ou  , Andy Green 
Last updated 2012-09-26 (latest revision 2012-03-25)
Replaces draft-hou-pim-drlb
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


On a multi-access network such as an Ethernet, one of the PIM routers is elected as a Designated Router (DR). The PIM DR has two roles in the PIM protocol. On the first hop network, the PIM DR is responsible for registering an active source to the RP if the group is operated in PIM SM. On the last hop network, the PIM DR is responsible for tracking local multicast listeners and forwarding traffic to these listeners if the group is operated in PIM SM/SSM/DM. In this document, we propose a modification to the PIM protocol that allows more than one of these last hop routers to be selected so that the forwarding load can be distributed to and handled among these routers. A router responsible for forwarding for a particular group is called a Group Designated Router (GDR).


Yiqun Cai (
Sri Vallepalli (
Heidi Ou (
Andy Green (

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