I have managed to have this problem several times. This is how it happened to me:

 

1. Put a Solaris box in my seed file with SNMP polling forced.
2. Do not specify a community string in xnmsmpconf (this is the mistake)
3. Discover the box using netmon –y
4. Short time later, box shows up in discovery – red
5. Ping the box – green
6. Short time later box turns red again

 

This occurred for me, because the Solaris sub-agent will respond to an SNMPWALK with public community string (mind you, it’s not a valid response, but it’s enough to get NETMON to acknowledge it’s discovered. Since we always force our boxes to be SNMP managed, and since xnmsnmpconf is not configured, I am using SNMP polling, but SNMP is not actually working. I can see this also occurring if I had the SNMP address in xnmsnmpconf wrong (due to a host file or dns error for the interface I discovered not being the actual interface I’m polling. Therefore I may be specifying the wrong community string, and thus an snmp timeout occurs) At this point, I ping the box it turns green and when the next status poll occurs (snmp status poll) it fails and turns the box back red.

 

Not sure how you would have done this on a router, but it can be done by even by the best of us.

 

 

 

 

Hi Larry,
What you are describing sound like a something we have experienced with fault snmp agent,  SNMPv3 agents or Red Hat 3.0  snmp agents.
This may occur when NetView is configured to perform status checking using SNMP, but the snmp agent is not responding even thought you can ping the NIC.  Also, check to make sure you can snmpwalk both the "ip" and "interface" MIB tables on the agent.  
NetView 7.1.3 FP3 works best went communicating with a SNMPv1 agent.  
In the case of Red Hat 3.0 we found that the agent (net-snmp) had a problem with indexing between the "interface" and "ip" index and address tables. We found that we had to update Red Hat 3.0 net-snmp c! ode to "net-snmp-5.0.9-2-30E.6" to resolve problem.

Mark F Sklenarik  IBM SWG Tivoli Solutions  Quality Assurance   Business Impact Management and Event Correlation  Software Quality Engineer  IBM Corporation

 

free lancer <larrytechie AT yahoo DOT com> Sent by: owner-nv-l AT lists.us.ibm DOT com 11/05/2004 02:12 PM Please respond to nv-l

To nv-l AT lists.us.ibm DOT com cc   Subject [nv-l] Object Turn Red after Ping

Hi,
We have Netview 7.1.3 FP3 on AIX 5.1. There is some strange behavior on some of the deivces on the Map. There are showing up as red on map. When i ping them, they come back up as green and status is up and right after some time they go red again. But there is no problem of events coming in from those devices. I'm cluless in here. Could some out there help me please.
Many Thanks,
Larry.
 

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