MPLS on 2600XM Series Routers

I had difficulty finding an IOS version that would run MPLS on my 2611XM routers with 96MB RAM and 32MB flash, so thought I’d post the version that I’ve had success with. The image that worked successfully was c2600-jk9o3s-mz.123-24.bin. The routers are connected together on Fa0/1 on each router. Fa0/0 goes up to an ESXI

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.

MPLS MRU

MPLS MRU

The purpose of the MPLS MRU (Maximum Receive Unit) is to indicate the maximum size of a packet, including MPLS labels, that the local router router can forward without fragmenting. MRU is only locally significant. If an incoming packet belonging to a particular FEC (Forwarding Equivalence Class) exceeds the MRU calculated for that FEC, the