Cisco Systems 3560 Manual De Usuario

If a link within an EtherChannel fails, traffic previously carried over that failed link moves to the 
remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure 
that identifies the switch, the EtherChannel, and the failed link. Inbound broadcast and multicast packets 
on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel.

When you create an EtherChannel, a port-channel logical interface is involved:

With Layer 2 ports, use the channel-group interface configuration command to dynamically create 
the port-channel logical interface.

You also can use the interface port-channel port-channel-number global configuration command 
to manually create the port-channel logical interface, but then you must use the channel-group 
channel-group-number command to bind the logical interface to a physical port. The 
channel-group-number can be the same as the port-channel-number, or you can use a new number. 
If you use a new number, the channel-group command dynamically creates a new port channel.

With Layer 3 ports, you should manually create the logical interface by using the interface 
port-channel global configuration command followed by the no switchport interface configuration 
command. Then you manually assign an interface to the EtherChannel by using the channel-group 
interface configuration command. 

For both Layer 2 and Layer 3 ports, the channel-group command binds the physical port and the logical 
interface together as shown in 

.

Each EtherChannel has a port-channel logical interface numbered from 1 to 48. This port-channel 
interface number corresponds to the one specified with the channel-group interface configuration 
command.

101238

Channel-group
binding

Physical ports

Logical

port-channel