Virtual Private LAN Services
7750 SR OS Services Guide Page 807
PBB and IGMP Snooping
IGMP snooping feature provided for regular VPLS is supported similarly in the PBB IVPLS
context to provide for efficient multicast replication in the customer domain. The difference from
regular VPLS is the handling of IGMP messages arriving from the BVPLS side over a BVPLS
SAP/SDP.
The first IGMP join message received over the local BVPLS will add all the BVPLS SAP/SDP
components into the related multicast table associated with the IVPLS context. This is in line with
the PBB model where the BVPLS infrastructure emulates a backbone LAN to which every IVPLS
is connected by one virtual link.
When the querier is connected to a remote IVPLS instance, over the BVPLS infrastructure, its
location is identified by the BVPLS SDP/SAP on which the query was received and also by the
source BMAC address used in the PBB header for the query message, the BMAC associated with
the BVPLS instance on the remote PBB PE.
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