topic Re: VSP route tracking in ExtremeSwitching (VSP/Fabric Engine)

VSP route tracking

EF — Wed, 27 Oct 2021 13:07:20 GMT

Hi team,

I would like to know if VSP can track a route and take decisions depends of its state by it self or using XIQ workflows.

For example track the reachibility of a host and if it fails take another route even the first used route works.

Regards

EF

Re: VSP route tracking

Ludovico_Steven — Thu, 28 Oct 2021 09:58:04 GMT

This would probably require Python scripting support on VOSS. Or do you think this should be possible without on switch scripting ?

Re: VSP route tracking

EF — Thu, 28 Oct 2021 13:35:48 GMT

Hi Ludovico,

it doesn´t matter , via XMC workflow, script builtin in VSP or CLI command if this is available , I would like the available option, prefer simpliest option.

Regards

EF

Re: VSP route tracking

Ludovico_Steven — Fri, 29 Oct 2021 10:13:20 GMT

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)