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Catalyst 2940 Switch Software Configuration Guide
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Chapter 25 Configuring EtherChannels
Configuring EtherChannels
desirable mode. When configuring an interface for LACP, if the allowed range of VLANs is not the
same, the interfaces do not form an EtherChannel even when LACP is set to the active or passive
mode
• Interfaces with different spanning-tree path costs can form an EtherChannel if they are otherwise
compatibly configured. Setting different spanning-tree path costs does not, by itself, make interfaces
incompatible for the formation of an EtherChannel.
Configuring Layer 2 EtherChannels
You configure Layer 2 EtherChannels by configuring the Ethernet interfaces with the channel-group
interface configuration command, which creates the port-channel logical interface. You cannot put a
Layer 2 interface into a manually created port-channel interface.
Note Layer 2 interfaces must be connected and functioning for software to create port-channel interfaces.
Beginning in privileged EXEC mode, follow these steps to assign a Layer 2 Ethernet interface to a
Layer 2 EtherChannel:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify a physical
interface to configure.
Valid interfaces include physical interfaces.
Up to eight interfaces of the same type and speed can be
configured for the same group.