Hello
what is the best method to make redundancy link on this network?
focus on mikrotik router2 placed in city3! currently we change the routes manually... notice that one of my router is Cisco 2811 placed in city2
thanks for helping me

Instead of change routes manually i would use OSPF. i have good experiences with OSPF in a routeros enviroment.

Instead of change routes manually i would use OSPF. i have good experiences with OSPF in a routeros enviroment.

Thank u Jaykay
I don't have experience with OSPF, could u please introduce me some resources for study about implement OSPF routing protocol with mikrotik and cisco!

not easy to recommend the right material to study without knowing your background. You can find a lot of videos regarding OSPF and Link-State-Routingprotocols in general. Also the at Cisco website you can find couple of good articles about OSPF. My recommendation: only use AREA 0, at least in the beginning. In most networks one area is enough.