I have 4 routers having the same AS between them (IBGP).
Routers A1 and A2 host subnet Network A, while B1 and B2 host subnet Network B.
It was noted that A1 receives routes for subnet B from B1 while A2 receives routes for subnet B from B2.
In case link A1-B1 fails, A1 will loose all routes towards subnet B. Is there a way to receive these routes through A2?

thanks in advance
sandro