Virtual Private LAN Services
7210 SAS-X, R6 OS Services Guide Page 239
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 deviceto
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.
Configuration notes for VPLS forwarding:
The 7210 SAS-R6 devices, uses the packet header fields that computes the hash for unicast traffic
to be sent out of a SAP configured over a LAG and forwards it over the member ports of the LAG.
For unknown unicast, broadcast and multicast traffic, it does not compute a hash and forwards all
traffic out of the primary port of the LAG. For more information, see the 7210 SAS-M,R6,T,X
Interfaces Configuration Guide.
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