[c-nsp] OSPF issue

[John Elliot]

> >
> > NB - pings to/from both R1+R2 are clean(No loss/excessive latency),
> > and both ends(Ints) set to mtu of 1500.
> 
> Right, both ends are set to mtu of 1500.  Does it pass 1500?
> 
> ping <far-side> df size 1500
> 
> I'm suspecting an intermediate (carrier) MTU problem.  Neighboring up
> uses small-enough packets, but delivering the initial load of routing
> data hits the MTU problem and the session melts down.
> 

Thanks for the reply - can pass 1500:
#ping xxx.xxx.66.62 size 1500 df-bit repeat 100

Type escape sequence to abort.Sending 100, 1500-byte ICMP Echos to xxx.xxx.66.62, timeout is 2 seconds:Packet sent with the DF bit set!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Success rate is 100 percent (100/100), round-trip min/avg/max = 16/16/20 ms