iCall to trigger failover in case of BGP is down

This solution works partially from my point of view. Both LTMs have a static default route to the same router. This router contains information about all routes inside of environment. I can find the external route learned via BGP.

1. if bgp is down, but LTM still can reach the router and router knows about the specific route connected to the router, the LTM will stay active. It means that VIPs will be not advertised any more.

    

2. If I track the route that router learns via BGP and is not in the local routing table; and bgp session between active LTM and router is down, than the absence of route will trigger failover. This is good. But if this external route is disappeared from the routing table of the router and both LTMs track this route, than the both LTMs will make permanent failover to each other?