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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter21 Configuring EtherChannel
Configuring EtherChannel
To remove an interface from the EtherChannel group, use the no channel-group interface configuration
command.
This example shows how to assign Gigabit Ethernet interfaces 0/4 and 0/5 as static-access ports in
VLAN 10 to channel 5 with PAgP mode desirable:
Switch# configure terminal
Switch(config)# interface range gigabitethernet0/4 -5
Switch(config-if-range)# switchport mode access
Switch(config-if-range)# switchport access vlan 10
Switch(config-if-range)# channel-group 5 mode desirable
Switch(config-if-range)# end
Note For information about the range keyword, see the “Configuring a Range of Interfaces” section on
page 8-9.
Step4 channel-group channel-group-number mode
{auto [non-silent] | desirable [non-silent] | on}Assign the interface to a channel group, and specify the PAgP
mode. The default mode is auto silent.
For channel-group-number, the range is 1 to 64. Each
EtherChannel can have of up to eight compatibly configured
Ethernet interfaces.
For mode, select one of these keywords:
•auto—Enables PAgP only if a PAgP device is detected. It
places an interface into a passive negotiating state, in which
the interface responds to PAgP packets it receives but does
not start PAgP packet negotiation.
•desirable—Unconditionally enables PAgP. It places an
interface into an active negotiating state, in which the
interface starts negotiations with other interfaces by sending
PAgP packets.
•on—Forces the interface to channel without PAgP. With the
on mode, a usable EtherChannel exists only when an
interface group in the on mode is connected to another
interface group in the on mode.
•non-silent—If your switch is connected to a partner that is
PAgP-capable, you can configure the switch interface for
nonsilent operation. You can configure an inter face wit h the
non-silent keyword for use with the auto or desirable
mode. If you do not specify non-silent with the auto or
desirable mode, silent is assumed. The silent setting is for
connections to file servers or packet analyzers; this setting
allows PAgP to operate, to attach the interface to a channel
group, and to use the interface for transmission.
For information on compatible PAgP modes for the switch and its
partner, see the “PAgP M odes ” section on page 21-4.
Step5 end Return to privileged EXEC mode.
Step6 show running-config Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose