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This draft is a work item of the Layer 2 Virtual Private Networks Working Group of the IETF.
Title : PIM Snooping over VPLS
Author(s) : V. Hemige, et al.
Filename : draft-ietf-l2vpn-vpls-pim-snooping-01.txt
Pages : 37
Date : 2007-3-7
In Virtual Private LAN Service (VPLS), as also in IEEE Bridged
Networks, the switches simply flood multicast traffic on all ports in
the LAN by default. IGMP Snooping is commonly deployed to ensure
multicast traffic is not forwarded on ports without IGMP receivers.
The procedures and recommendations for IGMP Snooping are defined in
[IGMP-SNOOP]. But when any protocol other than IGMP is used, the
common practice is to simply flood multicast traffic to all ports.
PIM-SM, PIM-SSM, PIM-BIDIR are widely deployed routing protocols. PIM
Snooping procedures are important to restrict multicast traffic to
only the routers interested in receiving such traffic.
While most of the PIM Snooping procedures defined here also apply to
IEEE Bridged Networks, VPLS demands certain special procedures due to
the split-horizon rules that require the Provider Edge (PE) devices
to co-operate. This document describes the procedures and
recommendations for PIM-Snooping in VPLS to facilitate replication to
only those ports behind which there are interested PIM routers and/or
IGMP hosts.
This document also describes procedures for PIM Proxy. PIM Proxy is
required on PEs for VPLS Multicast to work correctly when Join
suppression is enabled in the VPLS. PIM Proxy also helps scale VPLS
Multicast much better than just PIM Snooping.
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