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| 3.9 |  | EtherChannel |
| 3.9.8 |  | Configuring Fast EtherChannel |

To configure EtherChannel on an IOS-based switch, on each of the participating interfaces (up to eight), enter the command channel-group channel-group-number mode{auto [non-silent] | desirable [non-silent] | on}. To remove an interface from the EtherChannel group, use the no channel-group interface configuration command.

Figure illustrates the configuration of EtherChannel on an IOS-based switch. A shortcut is available, beginning with Cisco IOS Software Release 12.1(5)T. Identical commands can be entered once for a range of interfaces, rather than being entered separately for each interface, using the interface range command.

To verify the EtherChannel configuration and view EtherChannel information, use the command show etherchannel [channel-group-number] {brief | detail | load-balance| port | port-channel | summary}.

The channel-group command replaces the port group command, which was used prior to Cisco IOS Software Release 12.1.

The show etherchannel command replaces the show port group command, which was used prior to Cisco IOS Software Release 12.1.

To specify the technique for load balancing (frame distribution) among links comprising an EtherChannel, use the command port-channel load-balance {dst-mac | src-mac}.

Verify the configuration with the command show etherchannel load-balance. Finally, to view PAgP status information, use the command show pagp [channel-group-number] {counters | internal | neighbor.