Please help. The prepended as-path is being preferred.

Hello,

​

I have two upstream ISPs on two different edge routers and IBGP between them.

Lets call them provider A and provider B. Provider B is prepended x 3 and provider A is not.

However, I still get a lot of traffic from provider B. If i look through a bgp looking-glass, they mostly see me from provider A but a lot are seeing me from Provider B. My FW is not happy as i'm having Async routing to my VPN peer. Traffic leaves provider A (local pref) and when i asked for a trace from my peer, they are coming from provider B and it's messing everything up.

Any clues would be greatly appreciated