Hey Guys,
I have looked at the wiki and the forum and i cant seem to find conclusive information as to what the MTU should be in order to run MPLS with VPLS tunnels over it.
It seems that VPLS requires a 1540 MTU in order to move 1500 byte packets.
here are my questions:
Will setting the MPLS MTU under MPLS Interface override the MTU settings under the general tab (winbox) for the individual interfaces?
We use the RB1000s to run all the routing and they will be the only devices that run routing, but we use RB333 and RB433 to create L2 links between these devices (n-streame-2 links with a bridge to ether1 that in return connect to the RB1000 on each side. see attachment) i know the nstreame2 links have a default MTU of 1600. The hardware of the 433AH can exceed the standard MTU by 22 bytes (ether1 ONLY), is this also true for the RB333?
Do I add the 22 extra bytes to 1518 or 1500? in other words can i set the MTU for ether1 on a 433AH to 1540? and is that what i need to do in order for VPLS links to accept 1500 byte packets without fragmentation.
Regards,
Martin Madsen