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Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
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Chapter31 Configuring EtherChannels Configuring 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
command without removing the physical interfaces, the physical interface s are shutdown. If you do not
want the member physical interfaces to shut down, remove the physical interfac es be f ore d ele tin g the
EtherChannel.
This example shows how to assign interfaces 1 and 2 with the PAgP mode desirable:
Switch# configure terminal
Switch(config)# interface range fasttethernet0/1 -2
Switch(config-if)# channel-group 5 mode desirable
Switch(config-if)# end
Configuring EtherChannel Load Balancing
This section describes how to configure EtherChannel load balancing by u s ing sour ce-b ased or
destination-based forwarding methods. For more information, see the “Understanding Load Balancing
and Forwarding Methods” section on page 31-6.
Beginning in privileged EXEC mode, follow these steps to configure EtherChannel loa d ba lanc ing:
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 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
destinations are sent on different ports in the channel.
•src-mac—Load distribution is based on the source-MAC
address of the incoming packet. Packets from different h osts
use different ports in the channel, but packets from the same
host use the same port in the channel.
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-MAC address by using the port-channel
load-balance src-mac global configuration command.
Step3 end Return to privileged EXEC mode.
Step4 show etherchannel load-balance Verify your entries.
Step5 copy running-config startup-config (Optional) Save your entries in the configuration file.