Cisco Catalyst 3560-X Software Configuration Manual page 1018

Understanding EtherChannels
Figure 1-3
StackWise Plus
Port-Channel Interfaces
When you create an EtherChannel, a port-channel logical interface is involved:
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•
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.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
1-4
Cross-Stack EtherChannel
Switch stack
Switch 1
port
connections
Switch 2
Switch 3
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.
Chapter 1
Channel
group 1
Figure 1-4.
Configuring EtherChannels and Link-State Tracking
Switch A
OL-25303-03