From what I read about MTU needed for MPLS/VPLS, the RB450G l2mtu at 1520 cannot do MPLS + VPLS without fragmentation is that correct ?

> /int pr
Flags: D - dynamic, X - disabled, R - running, S - slave
# NAME TYPE MTU L2MTU MAX-L2MTU
0 R ;;; Uplink
ether1 ether 1500 1520 1520

For non-fragmented plain TCP/IP inside of a VPLS tunnel you need 1522 L2 MTU.

If its in a vlan, another +4, another +8 if you wanna run PPPoE inside the VPLS tunnel.
For more discussion on MTU in regard to MPLS/VPLS see: http://tiktube.com/video/KHhE3aEKdDoDEJ ... sDlIoFqoq=

Thanks - that was what thought too. It Sucks. I have a lot of 450G's that would need to be replaced. Argh.