Hi, I have a puzzler.
I have two Cisco 7206VXr routers one with a G1 and the other with a 400
processor.
Between them terminated on a gig interface on each side is an ILEC provided
metro E connection that’s pretty vanilla using VLANs to address different
connections.
I have a /30 set up on a common VLAN between the two with the BGP peer set up
on that /30.
After 3 minutes, my session will reset I’m assuming do to lack of
keepalives / problems with MTU. Lots of googling as pointed me at various MTU
mismatch situations but I’m not sure what I’m doing wrong possibly assuming
something is set “in an interesting way” between the sites on the ILEC network.
On each interface I have the following
int gig x/x
mtu 1522
Assuming 1500 for standard Ethernet and 22 for the VLAN tags.
I also have the following set in global mode
ip tcp path-mtu-discovery
On both VXR devices code 12.4-25C is being run.
I would appreciate any pointers to investigate. What have I missed?
Thanks
Scott
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