21-10
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-03
Chapter 21 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
.
Step 4
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 interface with 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 Modes” section on page 21-4
.
Step 5
end
Return to privileged EXEC mode.
Step 6
show running-config
Verify your entries.
Step 7
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
