refer diagram below:
PE A -- P A -----CORE CLOUD ----- P B ---- PE B
RR C RR D
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.