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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 27 Configuring EtherChannels
Configur ing EtherChannels
To remove an interface from the EtherChannel group, use the no channel-group interface configuration
command. If you delete the EtherChannel by using the no interface port-channel global configuration
comm and with out removing the phys ical int erfaces, the physical interfaces are shutdown. If you do not
want the mem be r physi cal inter faces to sh ut d own, re move the physic al inte rfac es be f ore d ele tin g the
EtherChannel.
This example shows how to assign Gigab it Etherne t interfaces 0/1 and 0/ 2 with the PAgP mode
desirable:
Switch# configure terminal
Switch(config)# interface range gigabitethernet0/1 -2
Switch(config-if)# channel-group 5 mode desirable
Switch(config-if)# end

Configuring EtherChannel Load Balancing

This se cti on desc ribe s how to configure E ther Chann el lo ad bal ancin g by u sin g source -b ased or
destinat ion-ba sed forwar ding method s. For more inf ormati on, see th e “Understanding Load Balancing
and Forwarding Methods” sec tion on page 27-5 .
Beginning i n privileged E X EC mo de , follow these s teps to c on figure Et herCh an nel load ba lanci ng:
Command Purpose
Step 1 configure terminal Enter globa l configurati on mode.
Step 2 port-channel load-balance {dst-mac | src-mac} Configure an EtherChannel load-balancing method.
The default is src-mac.
Select one of these keywords to determine the load-distribution
method:
•dst-mac—Load distribution is based on the destination-host
MAC address of the incoming packet. Packets to the same
destination are sent on the same port, but packets to different
destinat ions are sent on different por ts in the channe l.
•src-mac—Lo ad dist ribution is b ased on the so urce -MAC
addr ess of the inco ming packe t. Pack ets from dif ferent h osts
use di f ferent port s in the channe l, bu t pack ets from the same
host use the same por t in the ch annel .
If the link partner to the switch is a physical learner, set the
load-distribution method to one of these ways:
•If the channel-group interface configuration command is
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 channel-group interface configuration command is
set to on, set the load-distribution method based on the
source-M AC a ddre ss by usin g the port-channel
load-balance src-mac global configurat ion c omma nd.
Step 3 end Return to privileged EXEC mode.