Symptom
Following an HA failover the service port on the active WLC configured to get its IP address via DHCP will lose connectivity after the DHCP lease expires (or the DHCP renew is forced via "config interface dhcp service-port disable/enable).
In case of WiSM2 this connectivity issue would cause the WLC and Cat6k to fail to exchange WCP keepalives, so the "show wism status" would show the active module as oper-down.
Conditions
* WLC or WiSM2 running 7.4.110.x or 7.5.102.x code in HA
* the service-port is configured for DHCP
* the problem is seen after the following events happen in the specified order:
- HA failover
- serivce port DHCP lease expiration
Workaround
Configure a static IP address for the service ports on both peers and then force a HA switchover.
From the active WLC, follow the steps below:
?config interface dhcp service-port disable?
?config interface address service-port ?
?config redundancy interface address peer-service-port ?
"redundancy force-switchover"
Note: forcing a switchover would kick out all the clients in 7.4 code, as well as any Mesh APs, so it's recommended to do this during a maintenance window.
Further Problem Description
