clarification on parents and dependencies

[Ivan Fetch]

   IT looks like this never ended up getting to the mailing list so I'm
resending...

Date: Fri, 2 Apr 2004 12:42:58 -0700 (MST)
Subject: clarification on parents and dependencies

Hello,

   Now that our switches have finally all been upgraded to Cisco and
there's better documentation of switch interconnectivity, I'm adding the
switch info to Nagios.  I'm hoping to get a reality check from folks
on-list about the following:


   1. In order for the Nagios box to ping a particular Sun workstation, it
has to go through two switches.  I can specify one switch using the
parent directive in the host definition for the Sun workstation, but where
should I specify the relationship of the switch which the Nagios box is
plugged into?  This seems a bit clugy, but I could specify the switch
which the Nagios box is directly connected to, as a parent to the switch
which the Sun workstation is connected to (even though it is not truly a
parent).  Is this kind of situation better handled by defining host
dependencies of some kind?

   2. Our switches are in a different sub net (apparently in order to be
trunked), so if something is going wrong with our router, we can not ping
the switches.  Would folks out there recommend specifying the router as a
parent to
each switch's host definition?  I see a kind of loop potential in that
technically one has to go through a switch in order to ping a router, but
pinging a switch requires going through the router (otherwise I"d be able
to define a more typical host -> switch1 -> primary switch -> router kind
of relationship).


   Of course what I'm going for here is a downed or overloaded switch
should result in unreachable messages, but not host down messages.

Thanks in advance for your input,
Ivan.




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