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All ports in a trunk must consist of the same media type (i.e.,
twisted-pair or fiber).
All ports in a trunk must be configured in an identical manner,
including communication mode (i.e., speed, duplex mode and
flow control), VLAN assignments, and CoS settings.
All the ports in a trunk have to be treated as a whole when
moved from/to, added or deleted from a VLAN via the specified
port-channel.
STP, VLAN, and IGMP settings can only be made for the entire
trunk via the specified port-channel.

channel-group

Use this command to add a port to a trunk. Use the no form to
remove a port from a trunk.
Syntax
channel-group channel-id
no channel-group
channel-id - Trunk index (Range: 1-6)
Default Setting
A new trunk contains no ports.
Command Mode
Interface Configuration (Ethernet)
Command Usage
When configuring static trunks, the switches must comply with
the Cisco EtherChannel standard.
•Use no channel-group to remove a port group from a trunk.
•Use no interfaces port-channel to remove a trunk from the
switch.
b_mgmt.book Page 178 Tuesday, July 8, 2003 5:24 PM