un-bundling...

a port channel configured with 2 ports each side creates a bundle...

als1#sh int po1                                                                
Port-channel1 is up, line protocol is up (connected)                           
  Hardware is EtherChannel, address is 0009.b73f.ce8c (bia 0009.b73f.ce8c)     
  MTU 1500 bytes, BW 200000 Kbit, DLY 1000 usec,                               
     reliability 255/255, txload 1/255, rxload 1/255                           
  Encapsulation ARPA, loopback not set                                         
  Full-duplex, 100Mb/s, media type is unknown media type                       
  input flow-control is off, output flow-control is off                        
  Members in this channel: Fa0/11 Fa0/12   


 als2#sh int po1                                                               
Port-channel1 is up, line protocol is up (connected)                          
  Hardware is EtherChannel, address is 0009.b752.d78b (bia 0009.b752.d78b)       MTU 1500 bytes, BW 200000 Kbit, DLY 1000 usec,                              
     reliability 255/255, txload 1/255, rxload 1/255                          
  Encapsulation ARPA, loopback not set                                        
  Full-duplex, 100Mb/s, media type is unknown media type                      
  input flow-control is off, output flow-control is off                       
  Members in this channel: Fa0/11 Fa0/12                    

  note the status of int f0/11 below:

als2#sh int f0/11 trunk                                                        
                                                                               
Port        Mode         Encapsulation  Status        Native vlan              
Fa0/11      on           802.1q         trunk-inbndl  1                        
                                      (Po1)               

 mistakenly the bundle is disrupted with access mode

als2(config)#int f0/11                                                         
als2(config-if)#sw mode acc                                                    
als2(config-if)#end                                                            
als2#sh int f0/11 trunk                                                        
                                                                               
Port        Mode         Encapsulation  Status        Native vlan              
Fa0/11      off          802.1q         not-trunking  1    

it becomes unbundled, though f0/12 is yet a member

 als2#sh int po1                                                               
Port-channel1 is up, line protocol is up (connected)                          
  Hardware is EtherChannel, address is 0009.b752.d78c (bia 0009.b752.d78c)       MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,                              
     reliability 255/255, txload 1/255, rxload 1/255                          
  Encapsulation ARPA, loopback not set                                        
  Full-duplex, 100Mb/s, media type is unknown media type                      
  input flow-control is off, output flow-control is off                       
  Members in this channel: Fa0/12                       
  

als2#sh int f0/12 trunk                                                        
                                                                               
Port        Mode         Encapsulation  Status        Native vlan              
Fa0/12      on           802.1q         trunk-inbndl  1                        
                                      (Po1)                             

als2#sh spann int f0/11                                                        
no spanning tree info available for FastEthernet0/11 

als2#config t                                                                  
Enter configuration commands, one per line.  End with CNTL/Z.                  
als2(config)#int f0/11                                                         
als2(config-if)#sw mode trunk                                                  
als2(config-if)#end                                                            
als2#sh int f0/11 trunk                                                        
                                                                               
Port        Mode         Encapsulation  Status        Native vlan              
Fa0/11      on           802.1q         trunk-inbndl  1                        
                                      (Po1)                      

als2#sh spann int f0/11                                                        
                                                                               
Vlan             Role Sts Cost      Prio.Nbr Type                              
---------------- ---- --- --------- -------- --------------------------------  
VLAN0001         Altn BLK 12        128.65   P2p                               
als2#

the port channel remained intact with one member...

l3 port channels...

this is almost exciting...


dsw1#sh run int po1
Building configuration...

Current configuration : 84 bytes
!
interface Port-channel1
 no switchport
 ip address 10.1.4.13 255.255.255.252
end

dsw1#10.1.4.14
Trying 10.1.4.14 ... Open


User Access Verification

Password:
dsw2#sh run int po1
Building configuration...

Current configuration : 84 bytes
!
interface Port-channel1
 no switchport
 ip address 10.1.4.14 255.255.255.252
end

dsw2#

be sure to use no switchport on the interface range you included in the channel group or it will complain, so too on the port channel interface before setting th ip address...