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Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 10 Configuring the Switch Ports
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
souce-MAC load distribution.
The Catalyst 2950 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 user EXEC commands described in Table 10-3 to display EtherChannel and PAgP status
information:
For detailed information about the fields in the displays, refer to the Catalyst 2950 Desktop Switch
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 10-3 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} privileged EXEC
command.
Displays PAgP information such as traffic information, the
internal PAgP configuration, and neighbor information.
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