Guys,
I just turned up a BGP session for a customer (doing BGP Failover for them). I
am using the "neigh ttl-security hops" cmd. A traceroute confirms it is 1 hop
away. The Cisco documentation explains that if a TTL is received that equals
the TTL value expected or is higher, the router will accept that packet.
I was troubleshooting it quickly and the cmd "neigh x.x.x.x ttl-security hops
254" is the only hop count that maintains the BGP session. I thought I recall
that the ttl-security cmd "must exactly" match the number of hops away from one
of Joe's videos. But, I thought we could use the "neigh x.x.x.x ttl-security
hops 1" which means it is 1 hop away and would accept a TTL of 254 or higher,
indicating that it is 1 hop away.
(TTL=255)-->(TTL=254)
PE--------CE
The IOS version of this 3925 is the following:
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.2(4)M5,
RELEASE SOFTWARE (fc2)
Thank you,
Chris
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