as shown on PDF diagram.
I got two office locations, Site A and Site B both sites have internet leased lines .
now I have a point to point line between both sites 100 mbps link.
i would like to use point to point link as below.
If WAN at Site A goes down then all Internet related traffic at Site A should go out via point to point line and get to internet world via SITE B WAN.
vice versa if WAN at SITE B goes down then all internet traffic from Site B should go out via point to point line to internet via SITE A's WAN.
along with above. all LAN local traffice between from both sites to each other should use point to point line,
Now if point to point line fails then all LAN Local traffic between both sites can go via IPSEC VPN Tunnels configured at Watcguard Firewalls .
both cisco 3750 switches are with IP Base license
could you guys please suggest best possible way of archiving above. i mean configurations needed at both cisco switches.