topic Re: WLC Redundancy has failed. Looking to restore. in Wireless

WLC Redundancy has failed. Looking to restore.

Mogwai — Mon, 10 Mar 2025 15:25:21 GMT

Hello, over the weekend it seems that our Cisco 5520's that are in an HA, went down & came in in a non-HA state.

(CEN-5520) >show redundancy summary
Redundancy Mode = SSO ENABLED
Local State = ACTIVE
Peer State = UNKNOWN - Communication Down
Unit = Primary
Unit ID = 00:A2:EE:9C:69:AD
Redundancy State = Non Redundant
Mobility MAC = 00:A2:EE:9C:69:AD
Redundancy Port = UP
BulkSync Status = Pending

Re: WLC Redundancy has failed. Looking to restore.

Mark Elsen — Mon, 10 Mar 2025 16:28:07 GMT

- Check if all network connections are solid on the controller, especially RP to RP ,

Re: WLC Redundancy has failed. Looking to restore.

Mogwai — Mon, 10 Mar 2025 17:02:34 GMT

Yes, all RP's are connected & passing traffic. One the Secondary unit, I do see the following error.

(Secondary) >show redundancy summary Redundancy Mode = SSO ENABLED Local State = MAINTENANCE Peer State = UNKNOWN - Communication Down Unit = Secondary Unit ID = 00:B7:71:8B:04:2F Redundancy State = Non Redundant Mobility MAC = 00:A2:EE:9C:69:AD Redundancy Port = UP Link Encryption = ENABLED Maintenance Mode = Enabled Maintenance cause= Peer RP is not reachable or Hardware model/Software version mismatch

I've checked the versioning of both the primary & secondary and both match. Although, the Bootloader & Emergency versions are different between the Primary & Secondary. Do those need to match as well?

Re: WLC Redundancy has failed. Looking to restore.

Mogwai — Mon, 10 Mar 2025 17:38:51 GMT

So, I believe I see the issue I just checked & I as mistaken & one of the RP ports isn't passing traffic. If I replace the possibly bad SFP & the interface comes back up, would there be downtime for the WLC's to enter back into an HA state or would downtime be required?

Re: WLC Redundancy has failed. Looking to restore.

Mark Elsen — Mon, 10 Mar 2025 17:41:20 GMT

- Both Bootloader & Emergency versions need to match!

Re: WLC Redundancy has failed. Looking to restore.

Mark Elsen — Mon, 10 Mar 2025 18:12:30 GMT

- Depends , start by issuing the command show redundancy summary again, when you replace the bad SFP ,

Re: WLC Redundancy has failed. Looking to restore.

Mark Elsen — Mon, 10 Mar 2025 18:14:40 GMT

- Here you have a number of other commands which can provide insights :
show redundancy summary
show redundancy infra statistics
show redundancy transport statistics
show redundancy keepalive statistics
show redundancy gw-reachability statistics
show redundancy config-sync statistics
show redundancy ap-sync statistics
show redundancy client-sync statistics

Re: WLC Redundancy has failed. Looking to restore.

Leo Laohoo — Mon, 10 Mar 2025 21:31:27 GMT

Power down the secondary WLC and replace the faulty SFP.

Power on.