Are you ASAs paired now or does that need to be done as well? Since you have 2 routers, you could configure hsrp on the lan side for the failover piece. The ASA would have 1 default route to the virtual IP. Then under BGP, you can set your route local preferences to be higher on RouterA than on RouterB. Then on RouterB you'd advertise a higher metric to the ISP for the same routes that you'll be advertising with RouterA.
You probably don't need local preferences (for outbound traffic). If you decide to go with hsrp, you'll only have a single active router at a time....
For the router's perspective, you could do something like (assuming you have a 192.168.1.0/24 subnet):
RouterA:
router bgp 1000
network 192.168.1.0 mask 255.255.255.0
neighbor remote-as
RouterB:
ip prefix-list Advertise permit 192.168.1.0/24
route-map Outbound permit 10
match ip address prefix Advertise
set metric 400
route-map Outbound permit 20
router bgp 1000
network 192.168.1.0 mask 255.255.255.0
neighbor remote-as
neighbor route-map Outbound out
The metric that you choose will need to be higher than the metric that router A advertises. The metric controls the inbound traffic.
HTH,
John
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HTH,
John
*** Please rate all useful posts ***
