Indication of dial backup?

[Paul Williamson]

How can I configure Nagios to recognize when a router is on dial backup (or connected via the non-primary link)?  I have about 300 locations and would like to see when a system is not connected via the primary interface.  I realize I'll probably need to define a template of some sort that all routers would fit into, but I'm not very familiar with how to indicate that the condition is good (on primary) or it is bad (on dial back up).  I've looked at the Nagios Exchange and didn't find any plugin or template.  

Thanks,
Paul


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