If use the "zInterfaceMapIgnoreNames" setting under my "Switches" device class. 
 I didn't care about perfomance stats on any of my 500 switch ports, so I told 
it to ignore the following interface names:

^(VLAN 1|unrouted VLAN|sc0|FastEthernet|GigabitEthernet|10/100 utp 
ethernet|10/100/1000 utp ethernet|gigabit ethernet without GBIC installed|short 
wave fiber gigabit ethernet|StackPort1|StackSub-St1-1|StackSub-St1-2|Null0)


It DRAMATICALLY reduced my system's overhead.  Once you add interfaces into 
this list, they will automagically disappear after the next modeling.  I've 
made a separate category for switches w/ stats that I can move switches to if I 
need to collect stats from them for any reason.  

I prefer this method over the mass disable option (since I couldn't make it 
work) since it allows me to use the stock install and not customize things too 
much.




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Read this topic online here:
http://community.zenoss.com/forums/viewtopic.php?p=24508#24508

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