Question

A service provider offers a multipoint VPLS service to a customer connecting five sites. Recently, one customer site experienced a Layer 2 loop caused by a misconfigured switch, and the resulting MAC learning storm exhausted the PE router's MAC address table for that bridge domain, degrading service for all five sites. The provider wants to limit the impact of a single misbehaving site so that only that site's forwarding is affected while the bridge domain remains stable. Which configuration should the engineer apply on the PE?

Accepted Answer

Configure a per-attachment-circuit MAC address limit with an action to shut down or restrict learning on the offending bridge-domain member

Answer

Enable split-horizon forwarding on all pseudowires in the VPLS full mesh

Answer

Configure MAC withdrawal (LDP MAC address withdraw) on the VFI to flush stale entries

Answer

Increase the MAC aging timer on the bridge domain to retain more entries