We have dual routers attached to two different ISPs. We also have two ASAs 5520 and 5510 behind each router. We want to implement BGP for failover and redundancy. We have L2L VPN's on both ASAs. How will BGP affect the secondary circuit that has the alternate ASA attached to it? In other words will the L2L VPN still be available on the secondary circuit after we have implemented BGP?