On AIX a command allows to switch from one ethernet port to another in a etherchannel (team).

ent0 and ent1 are defined as etherchannel in type failover. The etherchannel adapter is ent2.

To swicth on the backup adapter:

[root@srv1]/root# /usr/lib/methods/ethchan_config -f  'ent2'

Check the errorlog to detect the swicth.

[root@srv1]/root# errpt -a
---------------------------------------------------------------------------
LABEL:          ECH_CHAN_FAIL
IDENTIFIER:     F3846E13
Date/Time:       Fri Nov  5 16:43:10 CET 2010
Sequence Number: 13016
Machine Id:      00C0FD9C4C00
Node Id:         srv1
Class:           H
Type:            PERM
Resource Name:   ent2            
Resource Class:  adapter
Resource Type:   ibm_ech
Location:        
Description
ETHERCHANNEL FAILOVER
Probable Causes
CABLE
SWITCH
ADAPTER
Failure Causes
CABLES AND CONNECTIONS
        Recommended Actions
        CHECK CABLE AND ITS CONNECTIONS
        IF ERROR PERSISTS, REPLACE ADAPTER CARD.
Detail Data
All primary EtherChannel adapters failed: switching over to backup adapter

To switch back to primary:

[root@srv1]/root# /usr/lib/methods/ethchan_config -f  'ent2'

[root@srv1]/root# errpt -a
---------------------------------------------------------------------------
LABEL:          ECH_CHAN_RCVRY
IDENTIFIER:     8650BE3F
Date/Time:       Fri Nov  5 16:43:41 CET 2010
Sequence Number: 13017
Machine Id:      00C0FD9C4C00
Node Id:         srv1
Class:           H
Type:            INFO
Resource Name:   ent2            
Resource Class:  adapter
Resource Type:   ibm_ech
Location:        
Description
ETHERCHANNEL RECOVERY
Probable Causes
CABLE
SWITCH
ADAPTER
Failure Causes
CABLES AND CONNECTIONS
        Recommended Actions
        CHECK CABLE AND ITS CONNECTIONS
        IF ERROR PERSISTS, REPLACE ADAPTER CARD.
Detail Data
A primary adapter in the EtherChannel recovered: returning to main channel