lms 2.6 - cannot get snmp walk v3 to return context mib data

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Mar 11th, 2008
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I am trying to get Campus Manager to use snmp v3 on 3750 but it appears that CM is not able to query snmp v3 contexted mib data (dot1dBridge). I have read all related posts that I could find but I'm obviously missing something somewhere.

3750 is running 12.2(35)SE2

snmpv3 config:

snmp-server engineID local xxxxxxxxx

snmp-server group v3group v3 auth access 2

snmp-server user v3user v3group auth sha yyyyyy

snmp-server group v3group auth context vlan-154

snmp-server group v3group v3 auth write v1default

snmp v3 non-context queries using SNMP WALK work fine and when I configure snmp v2 community I can also use v2 indexed walks successfully. However when I do a v3 context walk I get this error:

The following is a SNMP walk of device starting from dot1dBridge.dot1dStp.dot1dStpPortTable

SNMP Walk Output



BRIDGE-MIB::dot1dStpPortTable = No Such Object available on this agent at this OID

If anyone has some insight it would be greatly appreciated.

Thank you....William

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Joe Clarke Tue, 03/11/2008 - 17:10
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The context config looks wrong, but that may be a typo. It should be:

snmp-server group v3group v3 auth context vlan-154

The object you want to walk in this context is dot1dTpFdbTable (or .

William Stridsland Wed, 03/12/2008 - 10:42
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Thank you for responding, Joe.

Sorry, the context config was a typo.

I've now verified the snmp v3 context functionality on the 3750 with a third-party mib browser so I'm left with something not working/configured right in LMS. My next step is to compare network traces from LMS' SNMP WALK tool and the third party browser.


Joe Clarke Wed, 03/12/2008 - 10:49
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I tested the SNMP Walk tool using Common Services 3.0.6, and it worked for me. If you have CS 3.0.6, enable debugging, then post the specified debug log.

William Stridsland Wed, 03/12/2008 - 12:40
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Here's the debug log. I'm noticing that the context isn't included in the arguments list and I've tried to issue the command from the command line but all I get back is a repeat of the OID, like this:

D:\program files\CSCOpx\objects\jt\bin>snmpwalk -v3 -l authNoPriv -n vlan-154 -a SHA -A xxxxxxx -e xxxxxxx -u CiscoWorks -Iu -r 5 -t 10 -d -m ALL

-M ..\jt\mibs nlwes2 dot1dTpFdbTable

dot1dTpFdbTable: (dot1dTpFdbTable)


Joe Clarke Wed, 03/12/2008 - 12:55
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I found a bug. I'm working on a patch now.

Joe Clarke Wed, 03/12/2008 - 13:18
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Okay, I have a working patch. You need to open a TAC service request to get it. Reference this Netpro thread, and have your engineer contact me directly to get the patch.

William Stridsland Tue, 03/18/2008 - 08:11
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Thank you, Joe - SNMP WALK now works correctly for v3 context mib data. I will move on with my original problem of getting Campus Manager to discover correctly.



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