Customer has two sites each with a DSL circuit into an 877. The two sites are linked with a bridged wireless bridge; all hosts on site A use A's router as the default gateway and vice versa. Each site's connection to the internet is NATed by the relevant Cisco.
(Internet)----[877 A] [877 B]----(Internet) | | --------
The customer would like to achieve a measure of redundancy by getting outbound internet traffic to fail over to the other site's DSL circuit in case of link failure or routing issues at the relevant ISP. I was thinking of using VRRP for this, however, can this be done in such a way that outbound internet traffic only traverses the wireless bridge when one of the DSL circuits has failed?