VPLS Features
Page 254 7210 SAS M Services Guide
VPLS MAC Learning and Packet Forwarding
The 7210 SAS edge devices perform the packet replication required for broadcast and multicast
traffic across the bridged domain. MAC address learning is performed by the 7210 SAS device to
reduce the amount of unknown destination MAC address flooding.
Each 7210 SAS maintains a Forwarding Information Base (FIB) for each VPLS service instance
and learned MAC addresses are populated in the FIB table of the service. All traffic is switched
based on MAC addresses and forwarded between all participating nodes using the LSP tunnels
Unknown destination packets (for example, the destination MAC address has not been learned) are
forwarded on all LSPs to all participating nodes for that service until the target station responds
and the MAC address is learned by the 7210 SAS associated with that service.
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