What I am looking into are different options that might be available to routing data between an Extreme 450a to one of two Cisco routers depending on whether router has failed OR the other end of the tunnel which resides at Verizon is down.
The only thing I can find is a little information on ping tracking but would like to know if there is any other methods to changing a route depending on the router or more importantly the tunnel state.
I thought about some type ping to the far side of the GRE tunnel but really this is a new thing that I am not quite sure how to do.
I added an attachment that has the area circled in red to illustrate the Extreme switch connected to two Cisco routers and what we are trying to do.
Thank you for any help in advance.