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Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBMBladeCenter, Software Configuration Guide
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Chapter24 Configuring EtherChannels and Layer2 Trunk Failover
Configuring EtherChannels
Configuring EtherChannels
These sections describe how to configure EtherChannel interfaces:
•Default EtherChannel Configuration, page 24-8
•EtherChannel Configuration Guidelines, page 24-8
•Configuring Layer 2 EtherChannels, page 24-9
•Configuring EtherChannel Load Balancing, page 24-11
•Configuring the PAgP Learn Method and Priority, page 24-12
Note Make sure that the interfaces are correctly configured (see the “EtherChannel Configuration Guidelines”
section on page 24-8).
Note After you configure an EtherChannel, configuration changes applied to the port-channel interface apply
to all the physical interfaces assigned to the port-channel interface, and configuration changes applied
to the physical interface affect only the interface where you apply the configuration.

Default EtherChannel Configuration

Table24-2 shows the de fault EtherChannel configuration.

EtherChannel Configuration Guidelines

If improperly configured, some EtherChannel ports are autom atically disabled to avoid network loops
and other problems. Follow these guidelines to avoid configuration problems:
•Configure an EtherChannel with up to eight Ethernet ports of the same type.
•Configure all ports in an EtherChannel to operate at the same speed s and duplex modes.
•Enable all interfaces in an EtherChannel. A port in an EtherChannel that is disabled by using the
shutdown interface configuration command is treated as a link failure, and its traffic is transferred
to one of the remaining interfaces in the EtherChannel.
Table24-2 Default EtherChannel Configuration
Feature Default Setting
Channel groups None assigned.
PAgP mode No default.
PAgP learn method Aggregate-port learning on all interfaces.
PAgP priority 128 on all interfaces. (Changing this value has no effect.)
LACP learn method Aggregate-port learning on all interfaces.
LACP priority 32768 on all interfaces.
Load balancing Load distribution on the switch is based on the
source-MAC address of the incoming packet.