I have a Cisco 3750 switch at each remote office, two total remote offices.
I have two WAN links, separate ISP's, from each remote office back to our HQ.
At the HQ, each ISP is handing off one Ethernet port for the "Point to Point" link.
Each WAN link is plugged into a Cisco 3750 at our HQ site. (2 separate switches though)
Right now I manually unplug/plug in a different ISP if there is a failure on one. How can I plug in both of these WAN links at the same time for automatic fail-over? I have tried using spanning tree, and it just creates a loop. Is there a specific protocol I could use that would allow for this?