The method to be adopted by the agent to add
port(s) to a Port Channel port.
If normal(1), then a compatibility check is done on the
parameters of the port(s) being added to this Port
Channel. The port(s) being added must have the same
physical and configured parameters as the Port
Channel port.
If force(2), a compatibility check is done on only
physical parameters. The port(s) being added to this
Port Channel port must have same physical parameters.
The operation will fail only if the physical parameters
are not same. The configured parameters of the
port(s) being added are overwritten by
configured parameters of this Port Channel port.