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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.
Add a physical interface to a port channel
The physical interfaces in a port channel can be on any line card in the chassis, but must be the same
physical type.
You can add any physical interface to a port channel if the interface configuration is minimal. Only the
following commands can be configured on an interface if it is a member of a port channel:
•
description
•
shutdown/no shutdown
• mtu
• ip mtu (if the interface is on a Jumbo-enabled by default.)
To view the interface’s configuration, enter the INTERFACE mode for that interface and enter the
show
config
command or from the EXEC Privilege mode, enter the show running-config interface interface
command.
When an interface is added to a port channel, FTOS recalculates the hash algorithm.
To add a physical interface to a port channel, use these commands in the following sequence in the
INTERFACE mode of a port channel:
To view the port channel’s status and channel members in a tabular format, use the
show interfaces
port-channel brief
(Figure 177) command in the EXEC Privilege mode.
Note: Port channels can contain a mix of Gigabit Ethernet and 10/100/1000 Ethernet interfaces, but FTOS
disables the interfaces that are not the same speed of the first channel member in the port channel (see
10/100/1000 Mbps interfaces in port channels).
Note: The S-Series supports jumbo frames by default (the default maximum transmission unit (MTU) is
1554 bytes) You can configure the MTU using the
mtu command from INTERFACE mode.
Step Command Syntax Command Mode Purpose
1
channel-member interface
INTERFACE
PORT-CHANNEL
Add the interface to a port channel.
The interface variable is the physical interface
type and slot/port information.
2
show config
INTERFACE
PORT-CHANNEL
Double check that the interface was added to
the port channel.