How an active interface in a single-mode vif is selected

When you create a single-mode vif, by default an interface is randomly selected to be the active interface, which is also known as a preferred interface. There can be only one active interface in a single-mode vif.

However, if you want to specify another interface as active, you can use the vif favor command to override the random selection. Additionally, if you want to specify an interface not to be considered when random selection is made, you can use the vif nofavor command. An interface specified by the vif nofavor command is known as the "not favored" interface.

• Selecting an active interface
  You might want to select one interface over another when you add a new, higher speed or higher bandwidth interface to the vif and want this new interface to be the preferred interface.