Switchover Why?

[Moudar]

Hi,

I got WLC 5520 running 8.10.190.0 and SSO.

When I started my work today I got a message from Prime:

Redundancy notification trap triggered by Controller '10.0.0.148' having Redundancy-Management IP '10.0.0.145', Local state is 'Active' and Peer Redundancy-Management IP '10.0.0.146' and peer state 'StandbyHot'

I dont know why did that happen, and no command shows me swichover detalis or why:

(Cisco Controller) >show redundancy   summary
            Redundancy Mode = SSO ENABLED
                Local State = ACTIVE
                 Peer State = STANDBY HOT
                       Unit = Primary
                    Unit ID = CC:46:D6:59:7B:4B
           Redundancy State = SSO
               Mobility MAC = CC:46:D6:59:7B:4B
               Redundancy Port  = UP
            BulkSync Status = Complete
               Link Encryption = ENABLED
Average Redundancy Peer Reachability Latency = 313 Micro Seconds
Average Management Gateway Reachability Latency = 495 Micro Seconds

  At the same time I could observe that ala my APs have cleared their "Usage traffic"!! I checked the uptime of many APs and that showed no sign of any restart.

Any ideas

[marce1000]

 - Perhaps due to some external network problem (not related to the controller) ; configure a syslog server on the HA pair , and follow  up on logs send around switchover but also in  general

 M.

[marce1000]

                - Adding : also configure  the same syslog server on the switches where the controllers are connected too , 

 M.

[MHM Cisco World]

If you connect wlc ha to hsrp then gw unreachable make wlc failover.

The wlc ha by rmi detect GW reachability.

Ap in wlc ha sso is not effect from wlc failover.

MHM

[Moudar]

The problem was HSRP failover. But the problem is that all APs restarted:

*Dec  3 23:00:49.847: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 10.0.0.148:5246
*Dec  3 23:00:49.851: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 27
*Dec  3 23:00:49.851: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 27
*Dec  3 23:00:49.851: %WIDS-6-DISABLED: IDS Signature is removed and disabled.
*Dec  3 23:00:49.975: %CAPWAP-5-AP_EASYADMIN_INFO: AP Easy Admin information - EASY_ADMIN is not set, turn off easy admin service!

*Dec  3 23:00:49.975: %CAPWAP-5-AP_EASYADMIN_INFO: AP Easy Admin information - Easy Admin is not enabled, turn it off!

*Dec  3 23:00:49.995: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 39
*Dec  3 23:00:49.995: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 39
*Dec  3 23:00:50.011: %CLEANAIR-6-STATE: Slot 0 down
*Dec  3 23:00:50.011: %CLEANAIR-6-STATE: Slot 1 down
*Dec  3 23:00:50.015: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to administratively down
*Dec  3 23:00:50.015: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to administratively down
*Dec  3 23:00:50.015: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 10
*Dec  3 23:00:50.019: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Dec  3 23:00:50.623: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 10
*Dec  3 23:00:50.651: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Dec  3 23:00:51.015: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Dec  3 23:00:51.043: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Dec  3 23:00:51.051: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset
*Dec  3 23:00:52.035: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Dec  3 23:00:52.043: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down
*Dec  3 23:00:52.079: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Dec  3 23:00:52.087: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Dec  3 23:00:52.095: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Dec  3 23:00:53.079: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Dec  3 23:00:53.087: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Dec  3 23:00:53.115: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Dec  3 23:00:54.115: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Dec  3 23:01:10.651: AP has SHA2 MIC certificate - Using SHA2 MIC certificate for DTLS.

*Dec  3 23:01:11.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.0.0.148 peer_port: 5246
*Dec  3 23:01:11.227: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 10.0.0.148 peer_port: 5246
*Dec  3 23:01:11.227: %CAPWAP-5-SENDJOIN: sending Join Request to 10.0.0.148
*Dec  3 23:01:11.291: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 56
*Dec  3 23:01:11.299: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Dec  3 23:01:11.307: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Dec  3 23:01:11.927: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 56
*Dec  3 23:01:11.931: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 10
*Dec  3 23:01:11.935: %CAPWAP-5-JOINEDCONTROLLER: AP has joined controller 5520New
*Dec  3 23:01:11.939: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Dec  3 23:01:12.147: %WIDS-6-ENABLED: IDS Signature is loaded and enabled%CRYPTO_PKI: Cert not yet valid or is expired -
    start date: 21:36:50 UTC Nov 5 2013
    end   date: 21:36:50 UTC May 20 2022

*Dec  3 23:01:12.179: %DOT11-3-NA_SENSOR_CERT_ERROR: Certificate installation error: Error in saving WSA certificate.
*Dec  3 23:01:12.299: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Dec  3 23:01:12.339: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Dec  3 23:01:12.347: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset
*Dec  3 23:01:12.939: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down
*Dec  3 23:01:13.331: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Dec  3 23:01:13.383: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Dec  3 23:01:13.391: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Dec  3 23:01:13.399: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Dec  3 23:01:14.383: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Dec  3 23:01:14.391: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Dec  3 23:01:14.423: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Dec  3 23:01:15.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Dec  3 23:01:36.359: %CLEANAIR-6-STATE: Slot 0 enabled
*Dec  3 23:01:38.411: %CLEANAIR-6-STATE: Slot 1 enabled

As you can see the process took about 2 minutes. I don't understand why the APs needed to go through this when the WLC is in SSO mode !

[Rich R]

They must have lost connectivity to the WLC.  It's no good having HA WLC if the infrastructure it's connected to can't deliver reliable connectivity for the WLC.  We do see a few APs go to their N+1 WLC during a switchover on 8.10 (with up to 3000 APs per HA pair) but for most it is a completely seamless switchover as expected.
So concentrate on why the WLCs possibly both lost connectivity.

[Rich R]

Use "show redundancy detail" and the other "show redundancy" commands to get more info on the reason.