[j-nsp] BGP MTU Mismatch

[Keegan Holley]

Does anyone know why a BGP session would constantly flap because of an MTU
mismatch.  I'm sure it's MTU since that is what fixed the problem.  The
peering is between a cisco and a juniper and both support PMTU discovery.  I
would assume any mismatches would be settled by the TCP MSS negotiation or
fragmentation (admittedly bad).  The peering flapped almost every three
minutes on the mark so it never made it past the first dead timer interval.
 Just curious if someone out there had ever gotten to the bottom of this
problem.