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.