I have 3 MT Routers in a triangle redundant topology, configured with RIP.
How can I monitor link states,? I’d like to be notified when active route is changing.
I cannot use ping or netwatch, of course thank you to redundancy 
TIA
Why do you use RIP?. It’s much better OSPF. If you are not ussing multiple core product you can turn on BFD .
Cheers.