I am working on a project were internet service will be added to a backup/DR data center to service users in case the internet service at the primary data center goes down. The two data centers are connected through an ethernet service. Currently the network default route points to the inside interface of the primary site firewall. In the case that the Internet Circuit at the primary site fails, how can I configure the internal network so that the default route switches over to the inside interface of the firewall at the backup location without manual configuration. I would assume I would need to do some sort of SLA monitoring on the firewalls (ASAs) to detect any outages on the circuit. Can I add a backup default route to the layer 3 switches on the inside (Nexus 7K at primary site, 4500X at backup site) so that when the SLA monitor detects an outage the backup default route is inserted into the routing tables?
I have this problem too.