On Thu, Oct 4, 2018, at 13:33, Gert Doering wrote: > On Wed, Oct 03, 2018 at 02:42:22PM -0700, Mike wrote: > > > > I have tried setting in the tunnel interface "ip mtu 1476" but I get an > > error: > > > > ip mtu 1476 > > IP MTU not supported on interface Tunnel0 > > Well, reasonable equipment supports user-settable MTU... does "mtu 1476" work?
No. But "tunnel path-mtu-discovery" does and adjusts the MTU to "Real life". there are alos options for min MTU & co. On an ASR920 in my network: #sh int tun 10050 | i MTU MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, Path MTU Discovery, ager 10 mins, min MTU 92 Tunnel transport MTU 9126 bytes # ping size 1500 df works. The other end is PPPoE (over a NNI that hopefully supports big enough frames) > Besides this, I'm not sure if GRE is fully supported on the ME3600 anyway > (as in "the forwarding hardware can utilize it", not in "the CPU knows > how to tunnel a packet"). It's a switch... That's the joker that needs to be discovered :) -- R.-A. Feurdean _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/