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"Discovery Poll" is something netmon does to try to discover new devices. It pulls the ARP cache (using SNMP) of the devices it already knows about and sees whether there are any addresses there which it has not already discovered and then it tries to discover them. This is set by default. If you uncheck the box, netmon will not find anything that it has not already found.
"Discover Node(s) Managed" is the way netmon usually discovers new nodes. This too is set by default. If you uncheck it, new devices are put on the map as unmanaged and you would have to select them or use nvmapuitl.sh to explicitly manage them before netmon would start to poll them.
New routers and networks on the other hand are usually discovered as unmanaged. To go to the next hop you have to manage them.
You should be able to find out for yourself what all the buttons and fields mean by clicking the Help button on the SNMP Configuration GUI. It's context-dependent. Alternatively, there is a lot of information in the NetView Administrator's Guide. You can view or download all the current NetView documentation here:
http://publib.boulder.ibm.com/infocenter/tivihelp/v3r1/index.jsp?toc=/com.ibm.itnetview.doc/toc.xml
James Shanks
Tivoli Network Availability Management Level Three
Network Availability Management
Tivoli Software, IBM Corp
1-919-224-1642 | T/L 687-1642 | ITN 26871642
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