Cisco Catalyst 2950 Command Reference Manual page 61

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
on
passive
Defaults No channel groups are assigned.
There is no default mode.
Command Modes
Interface configuration
Command History Release
12.1(6)EA2
12.1(12c)EA1
Usage Guidelines
You must specify the mode when entering this command. If the mode is not entered, an Ethernet interface
is not assigned to an EtherChannel group, and an error message appears.
You do not have to create a port-channel interface before assigning a physical interface to a channel
group. A port-channel interface is created automatically when the channel group gets its first physical
interface.
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 highly recommend that you do so.
You can create port channels by entering the interface port-channel global configuration command or
when the channel group gets its first physical interface assignment. The port channels are not created at
runtime or dynamically.
Any configuration or attribute changes you make to the port-channel interface are propagated to all
interfaces within the same channel group as the port channel (for example, configuration changes are
also propagated to the physical interfaces that are not part of the port channel, but are part of the channel
group).
In the on mode, a PAgP EtherChannel exists only when a port group in on mode is connected to another
port group in on mode.
If you do not specify non-silent with the auto or desirable mode, silent is assumed. The silent mode is
used when the switch is connected to a device that is not PAgP-capable and seldom, if ever, sends
packets. An example of a silent partner is a file server or a packet analyzer that is not generating traffic.
OL-10102-01
Enable on mode.
In on mode, a usable EtherChannel exists only when both connected port
groups are in the on mode.
This mode is not available on Long-Reach Ethernet (LRE) switches,
because LRE interfaces do not support an EtherChannel-only mode.
Enable LACP only if an LACP device is detected.
Passive mode places an interface into a negotiating state in which the
interface responds to LACP packets it receives but does not initiate LACP
packet negotiation. A channel is formed only with another port group in
active mode. When passive is enabled, silent operation is the default.
Modification
This command was introduced. It replaced the port group command.
The active and passive keywords were added.
Catalyst 2950 and Catalyst 2955 Switch Command Reference
channel-group
2-31