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Standby WLC 5508 reloads continuously in HA, release 7.6.100.0

Hi,

I exeprienced a reload problem in standby WLC, with HA in release 7.6.100.0.

I use a dedicated VLAN to transport the redundancy sync and all the HA info, 'cause the two WLCs are in different buildings.

The WLCs are 5508 model and they have same sw release.

ISSUE:

The standby WLC reload continuously 'cause it doesn,t find the default gateway.

(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 = 500)
Unit ID = 00:06:F6:DB:E3:E0
Redundancy State = SSO (Both AP and Client SSO)
Mobility MAC = 58:8D:09:CD:81:C0
Management Gateway Failover = ENABLED (Management GW failover would be operational in few moments)
Average Redundancy Peer Reachability Latency = 621 usecs
Average Management Gateway Reachability Latency = 0 usecs

Redundancy Management IP Address................. 40.231.36.6
Peer Redundancy Management IP Address............ 40.231.36.5
Redundancy Port IP Address....................... 169.254.36.6
Peer Redundancy Port IP Address.................. 169.254.36.5

!

!

Rebooting as default GW is not reachable from Standby Controller

Restarting system. Reason: Default Gateway is not reachable ..

The problem is that the WLC tries to ping the DGW using the primary IP management address belonging to the active WLC, so we have duplicated IP problem, ARP problem and so on .....

The standby WLC should use the redundancy managemet address to ping the default gateway, instead the primary IP management address!!!!!!

So the workaround is the CLI command :

config redundancy management-gateway-failover disable

on the primary WLC, via console or in SSH.

When the standby will reload it will inherit the config from the active primary WLC

(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 = 500)
Unit ID = 00:06:F6:DB:E3:E0
Redundancy State = SSO (Both AP and Client SSO)
Mobility MAC = 58:8D:09:CD:81:C0
Management Gateway Failover = ENABLED (Management GW failover is disabled as it is DISABLED on the Peer)
Average Redundancy Peer Reachability Latency = 666 usecs
Average Management Gateway Reachability Latency = 0 usecs

Redundancy Management IP Address................. 40.231.36.6
Peer Redundancy Management IP Address............ 40.231.36.5
Redundancy Port IP Address....................... 169.254.36.6
Peer Redundancy Port IP Address.................. 169.254.36.5

The workaround works in my experience.

In my opinion this is a bug...

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