VPLS Mesh Groups

AC

VPLS (Virtual Private LAN Service) is a Layer 2 VPN technology that allows the extension of a single broadcast domain across multiple sites. A VPLS network consists of multiple Provider Edge (PE) routers interconnected through a Multiprotocol Label Switching (MPLS) backbone.

VPLS mesh groups are used to limit the amount of flooding that occurs within a VPLS domain. A mesh group is a set of PE routers that have direct connectivity to each other. Mesh groups can be configured to limit the scope of broadcast, multicast, and unknown unicast traffic within the VPLS domain.

The correct statements regarding VPLS mesh groups are:

A. Unicast packets destined to another PE router within the same mesh group are dropped by the local PE router.

This statement is correct. When a mesh group is configured, unicast traffic between PE routers within the same mesh group is dropped by the local PE router. This behavior reduces the amount of flooding and helps to improve the scalability and performance of the VPLS network.

B. Unicast packets destined to another PE router in a different mesh group are dropped by the local PE router.

This statement is incorrect. Unicast packets destined to another PE router in a different mesh group are not dropped by the local PE router. Instead, they are forwarded to the appropriate remote PE router through the MPLS backbone.

C. Broadcast, multicast, and unicast packets of unknown origin received from a PE router are flooded to all local CE routers.

This statement is incorrect. When a PE router receives broadcast, multicast, or unknown unicast traffic from another PE router, it forwards the traffic to all remote PE routers connected to the same VPLS instance. The remote PE routers then flood the traffic to all local CE routers.

D. Broadcast, multicast, and unicast packets of unknown origin received from a PE router are flooded to all remote PE routers.

This statement is correct. When a PE router receives broadcast, multicast, or unknown unicast traffic from another PE router, it forwards the traffic to all remote PE routers connected to the same VPLS instance. The remote PE routers then flood the traffic to all local CE routers. This flooding behavior can be limited by configuring VPLS mesh groups.