Protocol Independent Multicast DR Load Balancing

Document Type Replaced Internet-Draft (individual)
Authors Yiqun Cai  , Sri Vallepalli  , Heidi Ou  , Andy Green 
Last updated 2012-04-18 (latest revision 2011-10-14)
Replaced by RFC 8775
Stream (None)
Intended RFC status (None)
Expired & archived
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IESG IESG state Replaced by draft-ietf-pim-drlb
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This Internet-Draft is no longer active.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 Routers (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 multiple 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.)