If SITE A's ISP is down, we would like to use the internet through the MPLS in Site B
I thought of using route ip sla method, but router A does not have the license to do so. Router B and the ASA can track routes in this manner.
RIP is advertised from site B through the MPLS and Router B gets its routes from RIP. Router A is not currently using RIP.
Can RIP be used in this situation? For example, under normal conditions, the default GW in site A is the firewall. If the ISP's gateway becomes unreachable, then IP SLA detects this, then the firewall changes its default gateway towards Site B. Then RIP changes the default GW for router A and B.
Is this a possible solution? Else, can another method be used in this scenario to accomplish what I am trying to do?