I have a simple topology as below
layer2 switch1 -- Router1 -- layer2 switch2 -- ISP router1 (T1) -- Internet (production T1)
layer2 switch1 -- Router1 -- layer2 switch2 -- ISP router2 (T1) -- Internet (New T1)
I have total of 2 T1s from 2 different ISPs and they are terminated on their routers which we do not manage.
Currently one T1 is in production and it is connected to a layer 2 switch and then connected to a router. Router does all the routing and hence the default route is pointed to ISP router. No routing protocols are configured on my router.
Now as I got a new T1, I would like to configure it on the same layer2 switch and the router, I would like to know if this is feasible and how can I configure the failover between the two T1s?