[c-nsp] MTU / BGP

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Tue Jul 21 18:43:59 EDT 2015


> Mark Tinka
> Sent: 21 July 2015 11:30
> On 21/Jul/15 11:02, CiscoNSP List wrote:
> > re path mtu failing...ME(New)->RR(New), MTU 9100, RR(New) links, All our
> own network(So we can run whatever MTU we like) -> rest of network to
> get to "old" RR's is via a third party L2 service, and has max MTU 1978...this is
> set on the egress Interfaces...should path discovery have worked here?
> 
> When I was running SRC, I had the very same issue.
> 
> It should have worked then, but it didn't. Disabling it was our solution.
> 

Hi Mark,

And this is what bothers me, maybe I'm too tired, but I can't think of a reason why Path MTU Discovery would not work properly (even with asynchronous MTU settings).

adam

 



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