I hoping someone can provide insight into why by default juniper calculates mpls mtu at 12 bytes less than the ip mtu? I've been testing using l3vpn and it seems that mpls mtu pads 8 bytes to its mpls mtu reducing the ip mtu the inside packet by 8 bytes. Quick example. So if mpls mtu is 1508 the ip mtu of the packet inside is 1500. That means the ip mtu of the mpls interface is 1520. The only reason I can see additional bytes needed on top of the l3vpn two is for fast reroute bypass. I assume it's for the safety factor although I am probably missing something. Any information is appreciated.
-Chip _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp