Specifications

28-11
Catalyst 2970 Switch Software Configuration Guide
78-15462-03
Chapter 28 Configuring EtherChannels
Configuring EtherChannels
To remove an interface from the EtherChannel group, use the no channel-group interface configuration
command.
Step 4
channel-group channel-group-number mode
{auto [non-silent] | desirable [non-silent] | on} |
{active | passive}
Assign the interface to a channel group, and specify the PAgP or
the LACP mode.
For channel-group-number, the range is 1 to 12.
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 or LACP.
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—(Optional) If your switch is connected to a
partner that is PAgP-capable, configure the switch interface
for nonsilent operation when the interface is in the auto or
desirable mode. If you do not specify non-silent, 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.
• active—Enables LACP only if a LACP device is detected. It
places an interface into an active negotiating state in which
the interface starts negotiations with other interfaces by
sending LACP packets.
• passive—Enables LACP on an interface and places it into a
passive negotiating state in which the interface responds to
LACP packets that it receives, but does not start LACP
packet negotiation.
For information on compatible modes for the switch and its
partner, see the “PAgP Modes” section on page 28-4 and the
“LACP Modes” section on page 28-6.
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