The following figure shows a network configuration where DSLAM is dual homed to a pair of redundant PEs by using MC-LAG. Inside the aggregation network, a redundant-pair of PEs is connecting to VPLS service, which provides a reliable connection to single or pair of Broadband Service Routers (BSRs).
PE-A and PE-B implement MC-LAG toward access. The active node synchronizes the IGMP snooping state with the standby node, allowing the standby node to forward multicast streams to receivers on the access side, if the active node fails.
Figure: DSLAM dual-homing using MC-LAG
