Enabling link aggregation
Before you enable link aggregation, set your switch to actively negotiate LACP. See your switch vendor's documentation for details. Passive negotiation mode does not work. If your switch is set to operate in passive mode, the switch cannot negotiate the appliance LACP connection. For an example of a Cisco® switch configuration running the IOS operating system set to active mode, view the online FreeBSD® Handbook.
All interfaces in each EtherChannel must be the same speed and duplex.