Is there any way to determine the age of a route/prefix in a bgp table?
Once a path has been selected as "best", is there a direct way of determining the criteria that actually drove the selection?
Most of the criteria can be seen in a "sh ip bgp prefix". However with all higher precidence criteria being the same, or ignored (in the case of MED if you haven't coded "always compare med"), how can you analyze the route selection? If I just go on age of peer, I have routes that appear to have the "wrong" one selected. But it would seem that peer age would not necessarily be accurate representation of the age of the route.
We have large descripancy in the amount of outbound traffic to 2 major ISP's, and want to better understand route selection and possible do some tweaking to better distribute the traffic.