Hello everyone. I have tested the ipsla, my topology like this:

I added ICMP Path Jitter monitoring link from R1 to R3 ( f0/0 ), I used Custom, and use one or more external nodes as a target(192.168.2.2), operations like this now


Then I shutdown R2 ( f0/0 & f1/0 ) port, but the link status displayed like this


Why Hop 1 - R2 has no packet loss? From this monitoring, how can i find which link was down?
Then I enable R2 ports (f0/0 & f1/0), and after a few minutes, I shutdown R2 ports (f0/0 & f1/0) again, this time monitoring like this

What's mean about this? Is this the ipsla bug?