If you want to track reachability of a host, this requires some continuous polling, which only makes sense if done on the switch itself.
If you do this from a workflow (external script), you'd have to have that workflow running continuously, either polling via SNMP or constantly doing some CLI command via SSH.
And if XIQ-SE was offline, rebooted, or unreachable the tracking would stop.
On VOSS you currently only have these features to play with:
- ACL filters with action forward-next-hop; if the next-hop ARP entry goes away the flow will then get routed by the IP routing table; but ARP entries don't go away quickly, can take up to 6 hours for an ARP entry to age out with default timers
- Link State Tracking: You can tie the state of a port to other ports. if the tracked port goes down (link down), the other tracking ports will go down as well
On EXOS you can run embedded Python scripts, and then there is no limit to the possibilities of what you can do. But it requires some dev-ops (there are threads on this forum which can help)