When 2 routers are linked directly together with eBGP between them, how is a link failure detected ? With the BGP timers ? Or faster with some sort of L1 tool?
BGP 1 has a lighter weight than BGP 2 (it's active/passive mode). So BGP 1 is the active route, all the traffic takes this path. BFD is not considered here.
It's running and suddenly Router 21 breaks down hence is not able to respond to Router 11 anymore. How does the router 11 detect it?
Thank you in advance, Kind regards,