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SNMP support for Cisco C9800 WLC HA

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User story

We want SNMP support for Cisco C9800 WLC in a HA setup.

Details of user story

Cisco C9800 WLC in HA setup uses the last digit in OID to identify a specific WLC. This means that when we do a failover PRTG will give an error on the sensor because the OID is changed. (see example below).

Querry towards the primary WLC, it responds with .3 in the end:

[email protected] ~ % snmpwalk -v2c -c private 10.48.39.133      1.3.6.1.4.1.9.9.109.1.1.1.1.4  

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.4.3 = Gauge32: 7 

Perform a failover:

vaperovi ~ % ssh user[email protected]

WLC11#redundancy force-switchover  
System configuration has been modified. Save? [yes/no]: yes 
Building configuration... 
[OK]Proceed with switchover to standby RP? [confirm] 

Query towards the secondary WLC which is currently active. It responds with .2 in the end.

vaperovi ~ % snmpwalk -v2c -c private 10.48.39.133      1.3.6.1.4.1.9.9.109.1.1.1.1.4 

SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.4.2 = Gauge32: 10 

This behavior is normal and expected. These numbers are going to be random and probably different between any 2 WLCs you have in your network, even if they are in HA.

PRTG should not be querying 1.3.6.1.4.1.9.9.109.1.1.1.1.4.5 or 1.3.6.1.4.1.9.9.109.1.1.1.1.4.6 or whatever number comes after the last 4. You should be querying specifically 1.3.6.1.4.1.9.9.109.1.1.1.1.4, and WLC is supposed to answer with whatever number comes afterwards.

It is possible that this will affect other Cisco products as well. Including C9600 switches.

Acceptance criteria

  • Support for Cisco WLC C9800 HA

Status

Open

add-feature cisco ha prtg-kbtracker snmp

Created on Aug 17, 2021 11:06:04 AM by  dion299792458 (2) 1

Last change on Aug 18, 2021 5:22:34 AM by  Florian Lesage [Paessler Support]



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