Below link explains about vpn failover with dual isp and dual vr, but cant I use same VR.
Why its mandtory to use two VR.
for you to be able to make an outbound ipsec connection ,you need to initiate a connection from you rsystem out to the internet
for your packets to reach their final destination ,a route lookup needs to occur an d a routing decission to which interface your packets should egrtess out of
If you only have 1 VR, only 1 default route can be active so both your tunnels will egress out of the same interface
If you are able to add host routes you could try to point each tunnel's destination IP out of a different interface, this could allow for a single VR setup.
If you are not able to add a host route (if your ISP assigns you a dynamic IP for example) you will need to rely on the default route. In this case, you will need an additional VR so each ISP can have it's own default route and each tunnel will only be active on the VR with the preferred ISP's default route
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