Resolution
When active links are aggregated into an EtherChannel, the ports momentarily leave the Spanning Tree and join back as a single, logical port. Until the Spanning Tree reconverges, the network traffic is disrupted.
On the other hand, if a LAN port is shutdown in an EtherChannel, it is treated as a link failure. Its traffic is transferred to one of the remaining ports in the EtherChannel.
Note: All LAN ports in each EtherChannel must be the same speed and must be configured as either Layer 2 or Layer 3 LAN ports.
Refer to Sample Configuration: EtherChannel Between Catalyst Switches Running CatOS and Native IOShttp://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094953.shtml for additional information.
Refer to articleHow to configure EtherChannel on Cisco Catalyst 6500 and 6000 switches that run Integrated Cisco IOS for information on how to configure EtherChannel on Cisco Catalyst 6500 and 6000 switches running Integrated Cisco IOS® System Software.
