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Beginner

SNMP comm str indexing with a shut VLAN

Hi,

Hope someone can help us with the following. We encounter problems when accessing a Bridge-MIB value using a SNMP comm str index of the VLAN.

The VLAN (interface) in question is shut. If the SNMP comm str index is used for this VLAN, the Cisco device generates SNMP authentication failure traps.

So vb:

VLAN 100 is shut.

executing:

snmpwalk -community public@100 1.3.6.1.2.1.17.4.3.1.1

output:

SNMP authentication failure traps

For us the questions are:

  1. Is this normal behaviour?
  2. Is the SNMP comm string index (MIB instance) available when the VLAN inf is shut?
  3. If so, is it possible to enable the MIB instance eventhough the VLAN inf is shut?

Thanks in advance for the help!!!

Kind Regards

3 REPLIES 3
Hall of Fame Cisco Employee

Re: SNMP comm str indexing with a shut VLAN

Yes, this is expected behavior.  We have an enhancement request, CSCsz22771 open to allow for the state of a VLAN to be polled (to avoid polling those that are inactive).  You will not be able to poll inactive VLANs.

Beginner

Re: SNMP comm str indexing with a shut VLAN

Hi Joseph,

Thanks for the answer. Is it possible to sent me the information on this enhancement request CSCsz22771?

Thanks in advance

Hall of Fame Cisco Employee

Re: SNMP comm str indexing with a shut VLAN

Currently, there is no existing mib object to shut/no shut a vlan.  CLI does allow user to shut down a vlan.  Once a user shut down a vlan from the CLI, there is an additional vlan status shown in 'show vlan id xyz',  yet there is no MIB objects to show this additional status.  vtpVlanState is mapped to the first value in the Status but there should be a way to show additional status.

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