[nsp] ospf over tunnels

[Mark Kent]

>> It's the MTU on the tunnel interface that's the problem, not the
>> MTU on the physical interfaces. Set the MTU on both tunnels to be
>> the same and it should work.

I don't think so, this is what I have:

telehouse#sh in tu0
Tunnel0 is up, line protocol is up 
  Hardware is Tunnel
  Description: tunnel to AN0 router in AboveNet
  Internet address is x.y.z.254/30
  MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, rely 255/255, load 1/255

an0#sh in tu0
Tunnel0 is up, line protocol is up 
  Hardware is Tunnel
  Description: tunnel to WCG in Telehouse
  Internet address is x.y.z.253/30
  MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, rely 255/255, load 1/255

And I cannot set the MTU on the tunnel:

an0#conf t
an0(config)#in tu0
an0(config-if)#mtu 1460
% Interface Tunnel0 does not support adjustable maximum datagram size

-mark