Port-Channel Interfaces - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Table of Contents

Configuring EtherChannels

Port-Channel Interfaces

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

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 12. This port-channel

interface number corresponds to the one specified with the channel-group interface configuration

Figure 27-2 Relationship of Physical Ports, Logical Port Channels, and Channel Groups

After you configure an EtherChannel, configuration changes applied to the port-channel apply to all the

physical ports assigned to the port-channel. Configuration changes applied to the physical port affect

only the port where you apply the configuration. To change the parameters of all ports in an

EtherChannel, apply configuration commands to the port-channel interface, for example, spanning-tree

commands or commands to configure a Layer 2 EtherChannel as a trunk.

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.

port-channel

Channel-group

Physical ports

Catalyst 3750 Metro Switch Software Configuration Guide

Understanding EtherChannels