i got two sites connected using WAN 100 mb point to point connection.
two cisco c3750x switches one at each site. (point to point line plugged into cisco)
two watch guard xtm firewall devices one at each site. (internet plugged into firewalls)
see attached diagram for details.
also attached switch configs for both switches.
during testing we take out internet cable for one site and can see switch routes traffic to internet via point to point line to other site internet line.
but this works only for around 30 sec then internet goes down for 30 sec.
again it starts working for 30 sec and then goes down so its continous loop.
not sure what I am doing wrong.
i want internet to failover also i use watchguard VPN tunnel to failover internal site routing if point to point link goes down.
hope someone can find the issue. thanks