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Dual ISP Routes Control Questions

What is the possible way/ways to control routing to different subnets in a dual ISP environments, with fail over preferably?

Here is a simplified GNS3 topology.

Site A and Site B are very close, running internal EIGRP between RTA and RTB. Site C is far away, connecting via ISP1 (running EIGRP) to Site A, and connecting via ISP2 (running eBGP) to Site B. Site C has a main router RTC1 and another layer 3 switch RTC2, running internal EIGRP in between. Would like to have the routing requirements in below.

From Site C to Site A and B:

Primarily use ISP1 for destination of, and with fail over to ISP2 if ISP1 is down.

Primarily use ISP2 for destination of and with fail over to ISP1 if ISP2 is down.

From Site A/B to Site C:

Primarily use ISP1 for destination of and with fail over to ISP2.

Primarily use ISP2 for destination of with fail over to ISP1.


I managed to get ISP1 as primary and fail over to ISP2 for all subnets but unable to separate the routes preference as above. Or I can use VRF to separate the routes preference, but I don't know how to fail over...


Any suggestion is welcome. Thanks a lot in advance.