hi all,
I have a l2tpv3 tunnel setup between 2 x 3845 routers. Now, there is roughly about 100-150mbps or more traffic flowing across the tunnel. Now, some large files seemed to be transferred over the link and its causing heaps of fragmentation on the router which is spiking up the CPU. Now, I read about MTU tuning for l2tpv3 tunnels and added ip pmtu under the tunnel configuration. Now, I can see performance improvement in the CPU
However, my eigrp behind the routers starts flapping madly after a couple of minutes. the neighbor adjacency doesn't form at all. I removed the ip pmtu and reset the tunnel and now its all fine.
The network setup is simple.
R1----R2-----R3----R4.
R2-R3 : L2tpv3 tunnel
R1-R4 : Eigrp neighbors
Can anyone shed some light as to what is causing this to happen? I have found in one post similar issue but it didnt explain what might have caused this to happen
https://supportforums.cisco.com/message/553339#553339
Any help would be appreciated.
Regards,
