Monitoring a router

[Marc Powell]

On Sep 1, 2009, at 4:41 PM, David Dyer-Bennet wrote:

> Right now I'm just pinging it.  That works, in the sense that I get  
> the
> ping back. But I am suspicious that, if the link went down, the router
> would still respond to pings.
>
> Is this "best practice" in the opinion of the community?

We monitor about 3000 routers with ping only. We ping an RFC 1918 IP  
assigned to the loopback interface on the router. That way, as long as  
any serial interface on the router is up, the router is still 'up'  
without us having to configure every a ping for every serial  
interface. This is sufficiently 'up' for our SLA purposes... For the  
purposes of parenting, the ping check is likely sufficient.

We also monitor the individual interfaces via SNMP to know when any  
one goes down. We have a process such that we don't need to add each  
specific serial interface into nagios but just figure what should be  
up in real time.

--
Marc


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