PE A and P A located remotely. P B and PE B are at inside the core and close to RR C and RR D
Few places, we used c3640 as a PE and c72xx as P. RR is c75xx
PE A and PE B are client for RR C. (ipv4 and vpn4)
P A and P B are client for RR D (normal ipv4)
Problem is PE A always lost bgp conenction with RR C. show logg shown BGP-5-ADJCHANGE many times and show ip bgp sum, up/down session is very short time. If backbone or WAN contribute to lost bgp session, P A up/down is very stable and not down for long long time.
is this because RR C?. I don't think so PE B did not show bgp lost logg.
Maybe because ios, mp-bgp config or else?
Can someone assist me. And is there anyone that use c3640 as PE. can you let me know which IOS that u are using.
The only other thing is whether PE A is directly connected to the circuit that is failing. Therefore, its neighbor will drop due to factors other than the BGP keepalive (i.e. losing carrier where BGP will drop immediately, or the interface keepalive),
That same problem i was suffering from in our network but the difference was that we're using MGX 8850 with RPM-PR acting as the ATM Edge LSR.....while BPX 8600 with Router 7200 (External LSC) acting as the ATM LSR.
That MP-BGP flapping behavior between the PEs was solved by IOS upgrade as there was a bug in the IOS we were using which was affecting the TCP session upon which the BGP session established.
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