monitoring switches

[John A. Sullivan III]

On Thu, 2006-11-02 at 12:04 -0800, Patrick Morris wrote:
> > What are ways that anyone has found to monitor switches and routers
> > effectivly, other than adding a service to them.  i have WAN locations
> > that i would like to monitor but the switches/routers in between would
> > all stay pending if i dont have the host up service on them.  i only
> > want them to be checked if there is an issue and nagios is back tracing.
> 
> Unless I'm mistaken (which happens more frequently than I'd care to
> admit), setting them up with just a host check should do what you want.
> 
> Normally, they'd only get checked initially, when service states change,
> and if a child host becomes unreachable.
> 
> Since service states won't change if you have no services, the default
> behavior should do what you want, I think.  You just need to make sure
> you set up the parent/child relationships correctly.
> 
<snip>
That is what we found in our environment with one exception.  In our
work, we build large VPN WANs with highly granular security using the
ISCS network security management project (http://iscs.sourceforge.net).
We are normally only interested in the routers in front of the gateways
if there is a problem getting to the gateway.  Thus we did not need
services on the routers in front of the gateways.

That changed when we implemented flap detection.  We had some sites with
very unstable Internet connections.  When we implemented flap detection
on the Internet routers, we found they would always stay in a flapping
state of there was a single change in status since status was checked so
infrequently.  We had to implement services on them to get a meaningful
state history for the flap detection algorithms.
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan at opensourcedevel.com

Financially sustainable open source development
http://www.opensourcedevel.com


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