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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 10.64.18.0/24, 10.64.140.0/24 and 10.64.160.0/24 with fail over to ISP2 if ISP1 is down.

Primarily use ISP2 for destination of 10.64.142.0/24 and 10.64.162.0/24 with fail over to ISP1 if ISP2 is down.

From Site A/B to Site C:

Primarily use ISP1 for destination of 10.64.190.0/24 and 10.64.197.64/24 with fail over to ISP2.

Primarily use ISP2 for destination of 10.64.192.0/24 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.

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