9800-CL Mobility MAC address changes breaking Tunnels

[pgill.uwo@gmail.com]

I have foreign ( physical 9800 HA pair ) and anchor ( virtual 9800-CL HA ). Mobility MAC on 9800-CL controllers keeps changing breaking tunnel between Foreign and Anchor Controller. I can re-create tunnels but they break within a day. I suspect this is caused due to some MAC address conflicts but not sure. My environments for virtual controllers is ESXi based.

Some Error messages from logs:
%IOSXE-4-PLATFORM: Chassis 2 R0/0: cpp_cp: QFP:0.0 Thread:000 TS:00000017871454537221 %SWPORT-4-MAC_CONFLICT: Dynamic mac 001E.BY04.61FF from GigabitEthernet2 conflict with SVI, please check the network topology and make sure there is no loop.

Appreciate help.

[balaji.bandi · Accepted solution]

You need to setup the Mobility MAC to be consistancy :

check Mobility MAC :

You should see Mobility MAC should be same on Active and Standby ? (if you not you see MAC changing when the failover occurs)

you can setup the Mobility MAC

save the config and verify the active and standby have same MAC address.

[marce1000 · Accepted solution]

 - Note that in these configurations (when a HA pair is involved with an anchor - mobility setup) , it is advised to configure  a mobility MAC manually because when a failover occurs the MAC address associated with the WMI changes, the corresponding CLI for configuring the mobility MAC (on the HA pair)  is :
                C9800 (config) # wireless mobility mac-address <MAC>

                     You may also find these commands useful :
                       show wireless mobility summary
                       show wireless stats mobility
                       show wireless stats mobility messages

  Also have a checkup of the HA pair configuration (the master) and the cloud controller with these procedure(s) :
    Use the CLI command : show  tech   wireless , have the output analyzed by  https://cway.cisco.com/tools/WirelessAnalyzer/  , please note do not use classical show tech-support (short version) , use the command denoted in green for Wireless Analyzer.               Checkout all advisories!

 M.
   

[pgill.uwo@gmail.com]

Sincere Thanks Balaji and Marce. This resolves my current issue but I am seeing one more issue. Both 9800-cl controllers are rebooting everyday not sure what is causing this, I can ask in a different thread.
Grateful always for support.

[marce1000]

 -  Note that the bootflash will then normally contain  a file called reload_info which list a (the) reload reason , as can also be seen with the output from the show version command or as such use the command : more bootflash:reload_info , 

 M.

[Rich R]

Make sure you're running latest TAC recommended IOS-XE as per link below.
If you're still seeing crashes then open a TAC case providing full show tech, show tech wireless and any core and crashinfo files from the WLC.  TAC will decode the crashes and confirm if they're caused by a known bug or something new and advise next steps.