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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
channel-group
channel-group
To assign and configure an EtherChannel interface to an EtherChannel group, use the channel-group
command. To remove a channel group configuration from an interface, use the no form of this command.
channel-group number mode {active | on | auto [non-silent]} | {passive | desirable [non-silent]}
no channel-group
Syntax Description
Defaults No channel groups are assigned.
Command Modes Interface configuration
Command History
Usage Guidelines You do not have to create a port channel interface before assigning a physical interface to a channel
group. If a port channel interface has not been created, it is automatically created when the first physical
interface for the channel group is created.
If a specific channel number is used for the PAgP-enabled interfaces of a channel group, that same
channel number cannot be used for configuring a channel that has LACP-enabled interfaces or vice
versa.
You can also create port channels by entering the interface port-channel command. This will create a
Layer 3 port channel. To change the Layer 3 port channel into a Layer 2 port channel, use the switchport
command before you assign physical interfaces to the channel group. A port channel cannot be changed
from Layer 3 to Layer 2 or vice versa when it contains member ports.
You do not have to disable the IP address that is assigned to a physical interface that is part of a channel
group, but we recommend that you do so.
number Specifies the channel group number; valid values are from 1 to 64.
mode Specifies the EtherChannel mode of the interface.
active Enables LACP unconditionally.
on Forces the port to channel without PAgP.
auto Places a port into a passive negotiating state, in which the port responds to PAgP
packets it receives but does not initiate PAgP packet negotiation.
non-silent (Optional) Used with the auto or desirable mode when traffic is expected from the
other device.
passive Enables LACP only if an LACP device is detected.
desirable Places a port into an active negotiating state, in which the port initiates negotiations
with other ports by sending PAgP packets.
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.
12.1(13)EW Support for LACP was added.
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