BGP scan-time

Hi

As far as I understand, BGP scan-time is a feature that goes through the routing table every <X> time in order to evaluate next-hop reachability.

If I have R1 (AS1) -------------- R2 (AS23) -- R3 (AS23):

- bgp scan-time set to 5 secs on R3

- from R3 I can reach R1 loopback via R2 IP address (192.168.23.2) / BGP route

- R2 and R3 running OSPF

- if I shutdown R2 interface towards R3, shouldnt R3 remove the BGP route towards 1.1.1.1 from the routing table after 5secs?

​

Let me know if the above assumption is correct or not. Also because I found something as next-hop trigger and couldnt really understand the diference compared with scan-time, it looks like its same thing...

​

Thanks!