Redundant pair management

What you are looking for is in the ITCMLocalLB::Failover and ITCMManagement::Bigdb interfaces.

1. Is the device part of a redundant pair?

There is no "official" methods to determine this. But, that doesn't mean it can't be done. All of these values are stored in our internal config database which you can query with the ITCMManagement::Bigdb interface. Look for the following key (using the default db_name of "").

"Local.Bigip.StateMirror.PeerIPAddr"

If that key exists then the device is in a HA pair and the value is the address of the peer box.

String ITCMManagement::Bigdb::get_key( 
     in String db_name, 
     in String key_name 
 );

This is something that slipped through the cracks and I'll look into getting it added to the interfaces in a future release.

2. Is it active-standby or active-active?

enum FailoverState { 
     FAILOVER_STATE_STANDBY = 0, // Fail-over is in standby mode.    
     FAILOVER_STATE_ACTIVE = 1  
 }; 
  
 FailoverState ITCMLocalLB::Failover::get_failover_state();

3. What is the fail-over partner IP address?

See 1.

4. How to get/set preferred active unit information?

I'm not sure exactly what you mean by preferred active unit information. If you could elaborate on exactly what you want to get/set I can help out.

-Joe