How to find standby WLC details

[saitejatvn]

Hi Fellow WLC users :

i have a standby wlc as per below config : 
how can i test and confirm that HA is working fine and also need to pull the serial number of standby wlc - need help on this topic :

(dpeeeevvdeee-eee) >show redundancy peer-system statistics
Peer System CPU statistics:Current CPU(s) load: 0%
Individual CPU load: 0%/0%, 0%/0%, 0%/1%, 0%/1%, 0%/1%, 0%/1%

Peer system Power supply statistics:
Power Supply 1................................... Present, OK
Power Supply 2................................... Absent

[MHM Cisco World]

show chassis 

Check this command 

MHM

[saitejatvn]

(dddddd-usacdddd) >show chassis   -   is not giving any output

Incorrect usage. Use the '?' or <TAB> key to list commands.

(dddddd-usacdddd) >show inventory

Burned-in MAC Address............................ 00:Edddd
Power Supply 1................................... Present, OK
Power Supply 2................................... Absent/Failed
Maximum number of APs supported.................. 1500
NAME: "Chassis" , DESCR: "Cisco 5520 Wireless Controller"
PID: AIR-CT5520-K9

[MHM Cisco World]

https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/HA_SSO_DG/High_Availability_DG.html

Check this guide since you use wlc5520

And show inventory dont help much in HA 

MHM

[Leo Laohoo]

sh redundancy

[Rich R]

"show redundancy peer-system statistics" will show the standby serial number if you're running the recommended 8.10.190.0 software version (refer to TAC recommended link below) so if you're not seeing the serial number you're probably on old software like 8.5.x

In that case you will need to login to the standby on console or SSH and use "show inventory" or use the CIMC to check the standby WLC serial number.

> how can i test and confirm that HA is working fine
Do a "redundancy force-switchover" to prove that the WLC can switch over to standby safely.  If you're not sure it works then suggest you do that during a maintenance window and make sure you have console access to both WLCs (CIMC access will do too because you can access console from CIMC) in case one or other or both WLC go into recovery mode.