WLC (HA): AP SSO switchover problem

[Jaaazman777]

Hello!

We have two 7.4.100 controllers is AP SSO pair.

HA pair was configured according to HA guide

http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080bd3504.shtml

When I shutdown the Primary WLC, Secondary doesn't take his role until Primary starts booting up.

When primary is shutdown from Secondary CLI it is seen:

(Cisco Controller-Standby) >show redundancy summary

Redundancy Mode = SSO ENABLED

     Local State = STANDBY HOT

      Peer State = ACTIVE

            Unit = Secondary - HA SKU (Inherited AP License Count = 100)

The secondary stays in Peer State = ACTIVE state until Primary begins boot process.

When Primary begins the boot process, Secondary immediatly takes his role.

This behaviour doesn't look like right High Availibilty switchover.

[Scott Fella · Accepted solution]

You need to maybe just shut the power off to the primary to force the secondary HA to take the primary role. The reboot of a WLC isn't part of the HA process. If you want to simulate an HA failover, take a look at this link.

http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080bd3504.shtml#simulate

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[Jaaazman777]

You need to maybe just shut the power off to the primary to force the secondary HA to take the primary role. 

I described exactly the same situation. When I wrote shutdown, I meant power off.

After severel time reboot of both controllers, failover began to work fine. When Primary is powered off, standby immediately takes his role.

Rather strange...

Thank you for the link!

[Scott Fella]

Well HA isn't very stable at the moment with 7.3 or 7.4. So if you run into any stability issues can you please post them.

Thanks!

Sent from Cisco Technical Support iPhone App

[Yahya Jaber · Accepted solution]

HI,

have you tried to unplug the ethernet cables from the primary and see if the switch over works?

i have seen it before "when you power off, the HA doesnt work, it works only when you unplug the primary ethernet cables from the switch"

please let me know if you are able to test.

if the HA works when unplugging ethernet, i guess you are hitting

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCue02707

hope it helps.

[Jaaazman777]

Thank you, Yahya Jaber!

It really seems to be this BUG

I guess, some sort of workaround can be not saving config  just befor rebooting...