we've decided to enable snmp v3 on our 2950s and i'm currently testing this on one switch. i've flashed a 2950 to ios c2950-i6k2l2q4-mz.121-22.EA7.bin. SNMP is configured on the 2950 and works fine (snmpwalk from LMS works and device can be discovered using snmp v3). the problem occurs when i run a Campus Data Collection. The Data Collection runs for hours and when i check the ani.log, there are errors like the one below
Unable to fetch STP device instance params from device A.B.C.D for index XX
(where A.B.C.D is the ip of the snmp v3 2950 and XX is one of our numbered vlans).
if i stop the LMS daemon and revert back to snmp v2 on the 2950, data collection works as normal. Can anyone help?
Sadly, these switches do not support and will never support SNMPv3 in a way that Campus requires. Campus must be able to query switches with SNMP contexts in order to obtain STP instance data as well as MAC address table entries. Since these switches do not support SNMP contexts, this cannot happen, and this Campus will fail when it tries to poll the device. The failure will manifest itself as a timeout which is most likely why you're seeing data collection run for a long time.
If you have XL or 2950 switches in your network, you will not be able to convert to SNMPv3 and use Campus as effectively as with v1/v2c.
There is no context support in 12.1 code. In order to get SNMPv3 working with IOS switches in User Tracking (and for STP Campus operations) you must be running recent 12.2 code on your switch. Context-capable code for the 3550 is 12.2(25)SEE or higher.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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