Thursday, November 12, 2020

Catch 22 Routing with IP SLA tracking?

Hey there, I'm currently faced with a paradoxical issue where we want to monitor a link for its service/connectivity availability. However when the service is down, the route to it will be removed so it can failover to a different network.

The situation however, is that, by default. The network in question (let's assume 8.8.8.8), is not reachable unless a static route to it is configured.

But this same static route configured is supposed to be deleted if the route comes down. (there's static routing redistribute in the L3 switch here, hence it the route change propagates through the entire network).

This leads to a situation where without the route, it cannot do an IP SLA check on its availability, hence the route will never be installed.

Is there a solution for this? Thanks!

TL;DR -
We want this:
ip sla 1 up - install route
ip sla 1 down - remove route

But we have this:
ip sla 1 - forever down, because route not installed, ip sla 1 cannot reach tracked route.



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