Retrieve SSIDs Associated with Policy Tag on Cisco 9800 WLC via SNMP

[brych126]

Hi all,

On Cisco 9800 WLC, Policy Tags are used to assign specific SSIDs (WLANs) to APs. I'm aware that we can retrieve the policy tag assigned to an AP using the following OID:
cLApPolicyTagName – CISCO-LWAPP-AP-MIB

However, I’m trying to find out which OIDs can be used to retrieve the list of SSIDs (WLANs) associated with a specific Policy Tag.

Has anyone worked with this or can point to the relevant MIB/OID for this mapping?

Thanks in advance!

[marce1000]

         - That's not possible with SNMP on the 9800 platform because the support for SNMP is limited,

  M.

[Leo Laohoo]

I would never make any attempts to alter any platform configuration using SNMP if the OS is IOS-XE because it will cause the platform to be unstable.

[Rich R]

As @marce1000 says SNMP support on 9800 is extremely limited.  Streaming telemetry and API (YANG - netconf/restconf) is where Cisco has put all their development resource.  A few MIBs were added for limited backwards compatibility and some new ones for the OID you mentioned but most of the new config model simply isn't supported at all by SNMP.  Even OIDs you find might not work.

See:
https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/217460-monitor-catalyst-9800-wlc-via-snmp-with.html

SNMP vs Telemetry

Older AireOS WLCs rely on SNMP as the main protocol for monitor. Majority of the relevant information like client count, number of joined access points, processor and memory usage can be obtained via SNMP query from the tool that monitors, to the WLC.

With 9800 WLC, the focus has been put on telemetry. Telemetry works in a "push" model where WLC sends out relevant information to the server without the need to be queried. Catalyst 9800 still offers SNMP for legacy purposes. Some information can be exclusive to telemetry and some of the OIDs previously available on AireOS are not yet available on 9800.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/catalyst-9800-programmability-telemetry-deployment-guide.html
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/b_c9800_programmability_telemetry_dg.html
https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2023/pdf/BRKEWN-2730.pdf