[c-nsp] BGP - Older routes?

[Vincent De Keyzer]

Hello list,

I have a BGP router with 2 eBGP peers (upstreams). This morning one of 
the two upstreams (say A) had a scheduled maintenance, and most of the 
outgoing traffic went to B. But when A came back up 4 hours longer, 
outgoing traffic mostly kept going through B, and traffic towards A did 
not reach back its previous level. As a consequence, there currently is 
now too much traffic going to B (given the current CDR).

I have no reason to believe that A has made any configuration change; so 
I believe this behaviour is due to "older route first" criterium of the 
BGP route selection algorithm (as described in step 10 of 
http://www.cisco.com/warp/public/459/25.shtml).

Does that sound like a reasonable? How do I check this is indeed the 
cause? If it is, would a "soft in" clear be enough to fix the problem?

Vincent