Dual ISP VPN failover with single VR

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Dual ISP VPN failover with single VR

L1 Bithead

Hi All, looking for some assistance to configure VPN failover for DR/BCP.


I've attached a basic diagram below


Currently, static route monitoring is set up on the outside interfaces of the firewalls at Site A, so if upstream from Site A ISP 1 fails Site A will use Site A ISP 2 to start forwarding traffic out.

From Site A we have two VPN tunnels built to allow Site A LAN to Site B LAN, Site B is also allowed to Site A using the same tunnels.



If Site A ISP 1 fails and we swap across to Site A ISP 2, is there a method to bring up the Site A ISP 2 Tunnel 2 automatically without having an IP assigned to the interface?

Site A already has static routing to Site B via the second tunnel, with a higher metric.


Ideally, I would like Site A to monitor (from its own mgmt loopback IP) the mgmt loopback interface at Site B and fail across the tunnel if it isn't reachable

Screenshot 2022-06-28 at 15.52.22.png





Hi Colin;
Sorry for replying a late, I had some issue to deal with.
There is no need to specify the source IP address because it's the local IP of the tunnel that is used. my 2 tunnels are in a /30 subnet. 
The monitor is the keepalive between the 2 tunnels.
I don't know if it's clear xD  

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