PAgP
auto + auto = no EtherChannel
desirable + auto = EtherChannel
desirable + desirable = EtherChannel
The channel-group member has to match for member interfaces on the same switch.
However, it doesn't have to match the channel-group number on the other switch.
(channel-group 1 on ASW1 can form an EtherChannel with channel-group 2 on DSW1).
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