If you have a stack it should present itself as a single switch just put channel-group 1 desirable nonsilent if you are going to another cisco on each of the interfaces you want in the channel . this is for a layer 2 etherchannel . For a layer 3 etherchannel is somewhat more involved and too long to write here , just go to the cisco.com site and search on configuring etherchannels,3750 .
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