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How to configure EtherChannel on Cisco Catalyst switches that run CatOS system software
EtherChannel can be configured manually with the appropriate commands, or it can be configured automatically if the switch negotiates the channel with the other side using Port Aggregation Protocol (PAgP). It is best to use the PAgP desirable mode to configure EtherChannel whenever possible. Sometimes when EtherChannel is configured manually, there are complications.
To create the channel manually, use the set port channelmod/port on command for each switch.
After the channel configuration, it is important that all member ports of the ettherchannel should have a physical link to the other side of the etherchannel. If the other ports that do not have a physical connection, the the show port channelcommand output shows 'notconnect' and it would not help in effective sharing of traffic among the links in the channel.