Reference Guide

Port-Channel/LAG (802.3ad) Commands
This section describes the commands used to configure port-channels, which is defined in the 802.3ad
specification, and that are also known as LAGs. Link aggregation allows you to combine multiple full-
duplex Ethernet links into a single logical link. Network devices treat the aggregation as if it were a
single link, which increases fault tolerance and provides load sharing. The LAG feature initially load
shares trac based upon the source and destination MAC address. Assign the port-channel (LAG)
VLAN membership after you create a port-channel. If you do not assign VLAN membership, the port-
channel might become a member of the management VLAN which can result in learning and switching
issues.
A port-channel (LAG) interface can be either static or dynamic, but not both. All members of a port
channel must participate in the same protocols.) A static port-channel interface does not require a
partner system to be able to aggregate its member ports.
Note
If you configure the maximum number of dynamic port-channels (LAGs) that your platform
supports, additional port-channels that you configure are automatically static.
port-channel
This command configures a new port-channel (LAG) and generates a logical unit/slot/port number for
the port-channel. The name field is a character string which allows the dash “-” character as well as
alphanumeric characters. Use the show port channel command to display the unit/slot/port
number for the logical interface. Instead of unit/slot/port, lag lag-intf-num can be used as an alternate
way to specify the LAG interface. lag lag-intf-num can also be used to specify the LAG interface where
lag-intf-num is the LAG port number.
Note
Before you include a port in a port-channel, set the port physical mode. For more information,
see speed on page 281.
Format port-channel name
Mode Global Config
addport
This command adds one port to the port-channel (LAG
). The first interface is a logical unit/slot/port
number of a configured port-channel. You can add a range of ports by specifying the port range when
you enter Interface Config mode (for example: interface 1/0/1-1/0/4. Instead of unit/slot/port, lag lag-
intf-num can be used as an alternate way to specify the LAG interface. lag lag-intf-num can also be
used to specify the LAG interface where lag-intf-num is the LAG port number.
Note
Before adding a port to a port-channel, set the physical mode of the port. For more
information, see speed on page 281.
Switching Commands
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