Understanding Physical Interfaces for Aggregated Ethernet Interfaces

You associate a physical interface with an aggregated Ethernet interface. Doing so associates the physical child links with the logical aggregated parent interface to form a link aggregation group (LAG). You must also specify the constituent physical links by including the 802.3ad configuration statement.

A physical interface can be added to any aggregated Ethernet interface as long as all member links have the same link speed and the maximum number of member links does not exceed 16. The aggregated Ethernet interface instance number aex can be from 0 through 127, for a total of 128 aggregated interfaces.

Note: If you specify (on purpose or accidentally) that a link already associated with an aggregated Ethernet interface be associated with another aggregated Ethernet interface, the link is removed from the previous interface (there is no need for you to explicitly delete it) and it is added to the other one.