Hi Andrew,
We see the issue you described below with the “SNMP Get Next Loop Detected” mostly on our Cisco Nexus 7K devices. Especially when we are trying to poll CBQOS metrics. We are currently working with both Cisco and CA to resolve this particular issue.
The amount of metrics ‘Not supported’ is painful for us as our users are used to seeing all the metrics we can gather from eHealth. Also, the self-cert process is not as intuitive as we had hoped for in IM 2.1, however we have heard that Plato will hopefully make it easier.
Thx,
jacquie
From: CA Infrastructure Management Global User Community (eHealth/Spectrum/NetQoS) [mailto:
CommunityAdmin@communities-mail.ca.com]
Sent: Thursday, February 28, 2013 2:15 PM
To:
mb.98745085.100389445@myca-email.ca.com
Subject: RE: [CA Infrastructure Management] RE: Discovery and metrics not being capt
Hi Jacquie,
No the 2.1.2 I downloaded was from the GA downloads area not a sprint. I think it was about 2-3 weeks ago. That being said it still seems to have the same issue as you.
I still believe there is a timeout issue on the snmp get next request. This can sometimes occur if at the time of the request the Host being polled is under high CPU load. Sorry for going all technical. This problem was evident in CA Spectrum and showed up in the form of a "SNMP Get Next Loop Detected" alarm. In basic terms Spectrum was being impatient in wating for a response from the host when it sent out an SNMP Get Next request. It was fixed with a hotfix and customer setting change in 9.2.2.
I suspect the Data Aggregator is having a similar problem when it does a discovery. In order to determine which metric families a host supported it would need to walk the snmp tree of the host to find out what OIDs it supports. If the timeout value on the snmp requests is too short for a busy host then it will timeout and as a result not return the supported OIDs and thus the supported metric families.
Feel free to chip in here Kyle, is there a setting that can be changed to increase timeout values?
Posted by:Andrew1
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