Hi
I have two peers with full tables,
ISP A broadcasts 508k
ISP B broadcasts 504K
I want to check which routes are missing in the table BGP from ISP B,
how to do it?
Wanting to do that / needing to do that is a bit extreme and meaningless, (it is quiet normal to have a variation of the total number of routes from different providers… (e.g. there are folks who are multi-homed and will advertise one large prefix to on provider and do smaller prefixes to other, traffic engineering).
Having said that, you will need to dump out the full routing table (do with SSH, and log to file), and then do your data analysis.
If you are looking for some command or a complex query to accomplish this on the MT, there is not one that exists, theoretically you can write a script to do so, but I believe it will consume a lot of the CPU processing for results which have a little practical purpose.
BTW, due to how BGP works, you will see the number of routes changing + or - /give or take a few, all the time.