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.
On the 7210 SAS-D, 7210 SAS-Dxp, 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C, the user can configure Layer 2 uplinks (i.e. Dot1q SAPs or QinQ SAPs) for uplink connectivity and access SAPs for customer connectivity as logical bridge ports in a VPLS service.
On the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C, the user can configure access SAPs for customer connectivity and mesh-sdp/spoke-sdp for uplink connectivity as logical bridge ports in a VPLS service.
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 using QinQ SAPs created on access uplink ports Unknown destination packets (for example, the destination MAC address has not been learned) are forwarded on all SAPs for that service until the target station responds and the MAC address is learned by the 7210 SAS associated with that service.