In one of our 1841 router I have configured IPSEC VPN's and having some issues while routing the traffic. The primary link will be Vlan 10 and secondary will be Cellular 0/0/0 interfaces and IPSEC is configured on both. For routing i am using OSPF for the primary path and a default route with higher AD pointing the Cellular interface for the secondary link when the primary fails.
The problem is, when the primary link fails the secondary link comes up and for some reason the traffic is not getting routed via the Cellular interface link. When I remove the VPN configs from the primary interface the traffic is getting routed via the cellular link and every thing is ok. I know if i use two subents for local lan and the primary links the issue will be fixed, but unfortunately i can't do that.
I guess some one will able to help me out to fix this issue. I have attached a diagram which might be helpful.