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27-11
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 27 Configuring EtherChannels
Displaying EtherChannel and PAgP Status
To return EtherChannel load balancing to the default configuration, use the no port-channel
load-balance global configuration command.
Configuring the PAgP Learn Method and Priority
Network devices are classified as PAgP physical learners or aggregate-port learners. A device is a
physical learner if it learns addresses by physical ports and directs transmissions based on that
knowledge. A device is an aggregate-port learner if it learns addresses by aggregate ports.
For compatibility with Catalyst 1900 series switches, configure the Catalyst 2950 switches for
source-MAC load distribution.
The Catalyst 2950 switch supports address learning only on aggregate ports even though the
physical-port keyword is provided in the command-line interface (CLI). The pagp learn-method and
the pagp port-priority interface configuration command have no effect on the switch hardware.
Note You should not set the learn method to physical-port because the switch is an aggregate-learning device.
If the link partner to the switch is a physical learner that has the channel-group interface configuration
command set to auto or desirable, the switch automatically uses the load-distribution method based on
the source MAC address, regardless of the configured load distribution method.
If the link partner to the Catalyst 2950 switch is a physical learner that has the channel-group interface
configuration command set to on, set the load-distribution method based on the source MAC address by
using the port-channel load-balance src-mac global configuration command.
Displaying EtherChannel and PAgP Status
You can use the privileged EXEC commands described in Table 27-3 to display EtherChannel and PAgP
status information:
For detailed information about the fields in the displays, refer to the command reference for this release.
Step 4
show etherchannel load-balance Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Table 27-3 Commands for Displaying EtherChannel and PAgP Status
Command Description
show etherchannel [channel-group-number] {brief |
detail | load-balance | port | port-channel | summary}
Displays EtherChannel information in a brief, detailed, and
one-line summary form. Also displays the load-balance or
frame-distribution scheme, port, and port-channel information.
show pagp [channel-group-number] {counters |
internal | neighbor}
1
1. You can clear PAgP channel-group information and traffic filters by using the clear pagp {channel-group-number [counters] | counters} privileged
EXEC command.
Displays PAgP information such as traffic information, the
internal PAgP configuration, and neighbor information.