i have 3 branch office connected to vpn concetrator. Now all work good.
I have to implement other vpn tunnel between two router (router-1 and router-2) like a backup tunnel if principal link failure.
SEE PICTURE in ATTACH
I think that i have to implement a dynamic rountin with OSPF.
Can you help me with any information or suggest it the best solution.
I woulk like to implemente link with yellow color.