VPLS Unicast Flooding
Unicast flooding problems, usually associated with switched networks, can also impact VPLS. If traffic is forwarded asymmetrically through a VPLS instance, unicast flooding of unknown frames can occur. I’ll step through a scenario where this could happen. I set a LAB up with two CSR 1000V routers acting as PE routers, providing a VPLS instance. GNS3 was used to run the IOS routers acting as CE and C routers. In this scenario we could imagine that CE3 and CE4 are…