SNMP classify probe unable to return SnmpObjectId.

aswathi
Tera Contributor

‎07-24-2017 06:45 AM

I am trying to discover a Cisco switch (Model WS-C3750X-48P ), however its giving active, could not classify error. We verified community string is configured and mid servers are added to ACL.

When i look into the input result of snmp-classify probe, i cant fond out the OID of the device as it does not have SnmpObjectId.

I wanted to add the OID in the snmo OID table. Can some one help to find out the OID of the device from the snmp-classify probe?

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tony_barratt
ServiceNow Employee
ServiceNow Employee

‎07-24-2017 07:37 AM

Hi Aswathi,


Probably the transfer of data is timing out before the switch has returned all the data.


Perhaps the switch was under load at the time of discovery and was giving a low priority to responding to SNMP requests.


Try rediscovering as an individual item via Quick Discovery a few times.



Please get back with results - if still failing perhaps we could arrange for a longer time out - if success that would be pleasing and informative!



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tony_barratt
ServiceNow Employee
ServiceNow Employee
In response to tony_barratt

‎07-24-2017 10:09 AM

Hi Aswathi,



Also there are a couple of timeouts, that can be configured for SNMP discovery, mentioned below that you may find useful.



SNMP Discovery parameters


Maximum time to wait for a response for the first OID request.mid.snmp.request.timeoutSpecifies the timeout value for the first OID request, in milliseconds. For subsequent requests (for example, table OIDs), the mid.snmp.session.timeout configuration parameter (see below) takes effect.

Note: You can override this parameter with the timeout SNMP probe parameter.


  • Type: Integer
  • Default value: 1500


Maximum time to wait for responses to OID requests once a session has been established.mid.snmp.session.timeoutSpecifies the timeout value for subsequent OID request, in milliseconds. SNMP communication is stateless and does not have a session or connection in the normal sense. The system regards a positive response from the first OID request as a sign that it should expect prompt responses to subsequent requests. While the default is short, it may be useful to increase this parameter value to the same value as that used for mid.snmp.request.timeout.

Note: You can override this parameter with the establish_session_timeout SNMP probe parameter.


  • Type: Integer
  • Default value: 500

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