Reference Guide

290 | Interfaces
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For example, if four interfaces (Gi 0/0, 0/1, 0/2, 0/3) in which Gi 0/0 and Gi 0/3 are set to speed 100 Mb/s
and the others are set to 1000 Mb/s, with all interfaces enabled, and you add them to a port channel by
entering
channel-member gigabitethernet 0/0-3 while in the port channel interface mode, and FTOS
determines if the first interface specified (Gi 0/0) is up. Once it is up, the common speed of the port
channel is 100 Mb/s. FTOS disables those interfaces configured with speed 1000 or whose speed is 1000
Mb/s as a result of auto-negotiation.
In this example, you can change the common speed of the port channel by changing its configuration so the
first enabled interface referenced in the configuration is a 1000 Mb/s speed interface. You can also change
the common speed of the port channel here by setting the speed of the Gi 0/0 interface to 1000 Mb/s.
Configuration task list for port channel interfaces
To configure a port channel (LAG), you use the commands similar to those found in physical interfaces.
By default, no port channels are configured in the startup configuration.
• Create a port channel (mandatory)
• Add a physical interface to a port channel (mandatory)
• Reassign an interface to a new port channel (optional)
• Configure the minimum oper up links in a port channel (LAG) (optional)
• Add or remove a port channel from a VLAN (optional)
• Assign an IP address to a port channel (optional)
• Delete or disable a port channel (optional)
• Load balancing through port channels (optional)
Create a port channel
You can create up to 255 port channels on an E-Series. You can create up to 128 port channels on C-Series
and S-Series.
To configure a port channel, use these commands in the following sequence, starting in the
CONFIGURATION mode:
The port channel is now enabled and you can place the port channel in Layer 2 or Layer 3 mode. Use the
switchport command to place the port channel in Layer 2 mode or configure an IP address to place the port
channel in Layer 3 mode.
You can configure a port channel as you would a physical interface by enabling or configuring protocols or
assigning access control lists.
Step Command Syntax Command Mode Purpose
1
interface port-channel id-number
CONFIGURATION Create a port channel.
2
no shutdown
INTERFACE
PORT-CHANNEL
Ensure that the port channel is active.