I have a small problem with the MTU on L2TPv3.
I built in my lab small IP core with Cisco routers and to edge IP routers I connected a PCs (or any IP routers) and I simulated L2TPv3 L2 VPN over them. The scenario working very good, without any problems. But I have a problem with large frames on Ethernet (which is encapsulated with L2TPv3 header). According to documentation, I tried to setup ip pmtu max <n> in pseudowire-class, but it didn`t work correctly. So, I applied on Ethernet interface ip tcp-adjust mss <n>...but I`m not sure that this is the right solution for me.
Please, can you help me with some idea to do not fragmentation of tunneled IP packets to smaller?
I know, that L2TPv3 do not supported fragmentation of packets before the encapsulation, so only encapsulated IP packets with L2TPv3 header is possible, but I don`t want it.
There is a one blocking point, I think. My lab is built on Cisco 1751-V Series routers and according to documentation, L2TPv3 feature is supported from Cisco 7200 Series routers.....
Thanks for an answers....