Symptom
++ IPSLA Pre-emption not working even when destination becomes reachable
ipsla-ftdv# show track
Track 1
Response Time Reporter 1 reachability
Reachability is Down <--
9 changes, last change 00:00:24
Latest operation return code: Timeout
Tracked by:
STATIC-IP-ROUTING 0
++ Packet tracer shows the generated ICMP packet are been sent out of failover ISP link, however the packet is silently dropped on the FTD and not sent to next device.
Result:
input-interface: ispone(vrfid:0) <-- track icmp initiated from ispone
input-status: up
input-line-status: up
output-interface: isptwo(vrfid:0) <-- outgoing interface selected isptwo
output-status: up
output-line-status: up
Action: allow
Time Taken: 61976 ns
Workaround
Add specific static route to monitored destination via tracked ISP
