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Redundant Internet connection through MPLS

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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?

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John Meggers
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Thanks,

The MPLS is managed by the ISP. I think they are running BGP  and redistributes our RIP.

There is a router in site B but I did not include it in the design. The client's default GW in both networks is the router (not the ASAs).

So, given this information, if both ASA advertises the default route and does route tracking, that would be a possible solution?

Also, if this works, how do you tell the network to "stop broadcasting" the default route since my guess is that the mpls should not advertise it?
The "stop broadcasting" should happen with the ASA withdraws the default route it was advertising.
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ASKER

Yes but how do you manage one default route at each site (so 2) and only one default route for both sites when the isp goes down?

If both sites advertises a default route, where does the "cutoff" happen so that the other site doesnt get that route? (but does when the failure occurs)

Sorry if I am being vague, do not hesitate do ask me questions if things are unclear

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This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.