Failover ISP from a different place

[savvas.ap]

Hi everyone,

I have a situation that I need to solve.

I have a P2P connection from city 1 to city 2, from city 1 to city 3, and from city 1 to city 2.

Currently, the P2P from City 2 and City 3 is live, and the P2P from City 1 to City 3 is on standby. I want to switch that and when it falls the P2P from City 1 to City 3 to take over from City 2. Until now we do it manually with the IP routes

Below is a graph of how it is connected with examples of IPs.

The allow network from City 1 to the City 3 is 192.168.25.0/24

There are some routes but I need to reconfigure it.

[MHM Cisco World]

you can use IP SLA track and EEM and action will add/remove route. 
this automatic change the path from one node 
MHM

[Richard Burts]

There is much that we do not know about this environment but if you are interested in failover then it seems to me that implementing a dynamic routing protocol would be the easy and effective way to recognize when a problem occurred and to failover to an alternate path.

[savvas.ap]

There are IP routes on each city but this does not affect on what we need to done as you can configure which network need to have routing. By saying dynamics route can you be more specific. Give an example?

[Richard Burts]

For dynamic routing there are multiple choices of protocol, including RIP, OSPF, and EIGRP. Perhaps the most simple would be RIP. Since this appears to be an all Cisco network you might want to use EIGRP. To give a full example we would need to know more of the details of your environment. But basically you start with a router statement: Perhaps router eigrp 100. Then there would be network statements for the connected networks (each router seems to have 2 P2P networks and then some number of lan networks each of which would be identified in a network statement.

[savvas.ap]

I want to avoid of licence purchase

[Georg Pauwen · Accepted solution]

Hello,

as stated by @Richard Burts a dynamic routing protocol (EIGRP or OSPF) would be the easiest way to accomplish the failover, which then would be automatic. Chances are very high that your routers already support these protocols, and that you do not need to upgrade or purchase any licenses. Go to config mode of your router and type:

Router(config)#router ?

If you see OSPF and EIGRP as options, you are good to go.