[c-nsp] Routing around errors

Geoffrey Pendery geoff at pendery.net
Fri Dec 9 15:16:21 EST 2011

We've seen an old nuisance issue becoming more prevalent lately - at
dual-homed sites one of the circuits will run errors, but not bad
enough to drop the routing protocol neighbor (OSPF in our case).

So a site with one good circuit and one error-heavy circuit will
continue to route traffic over the circuit with errors.  I'm curious
what solutions are prevalent out there, anybody want to weigh in?

Tune the hellos tight enough in the hopes of dropping the neighbors?
Alerts from monitoring system followed by manual intervention?
EEM scripts checking the counters?


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