It's my understanding that Zenoss's parent/child dependencies are all Layer 3 
based, via an ICMP test.  These dependencies  are can either be auto discovered 
(routing table discovery) or manually entered.  

Although it's not as quite a easy to manually manipulate as Nagios' 
dependencies it can be done, but the entire concept of layer 3 ICMP based 
testing of dependencies become decreasingly useful as network complexity 
increases.  

By relying on this type of dependency model how do you distinguish between a 
failure of the management engine as opposed to actual device failure?  Granted 
failure of the management plane on a device is important, but many devices will 
continue to route/switch/etc.. even after the management has gone to lunch.  In 
a situation where you need reliable outage metrics it would be wrong to assume 
that a management outage equals an outage to all connected devices.




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Read this topic online here:
http://community.zenoss.com/forums/viewtopic.php?p=20953#20953

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