We have a site we are deploying XGs at. They have two buildings on campus, with a private fiber link between them. Each building has it's own Internet connection. We'd like to deploy an XG at each site, and allow for ISP failover between them.
Scenario 1: ISP fails in building A, XG in building A changes it's default gateway to the XG in building B.
Scenario 2: On-campus fiber is cut, building A to building B traffic gets routed via a VPN/RED tunnel via the Internet.
Scenario 2 seems easy enough to implement, but I'm not sure how to handle Scenario 1. The XG only knows interfaces can be LAN or WAN, and routing Internet out of a LAN port isn't possible afaik. Would the XG learning a default route via OSPF be enough to send traffic out to the "partner" XG in the other building?
I'm assuming HA wouldn't be appropriate in this scenario.
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