31-10
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-10
Chapter 31 Configuring EtherChannels
Configuring EtherChannels
Step 3
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
LACP mode.
For channel-group-number, the range is 1 to 6. Each
EtherChannel can have up to eight compatibly configured
Ethernet interfaces.
For mode, select one of these keywords:
• active—Enables LACP only if an 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.
• 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.
• 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 PAgP and LACP modes for the
switch and its partner, see the “PAgP and LACP Modes” section
on page 31-4.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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