Applies a VRF to the interface

           Note: VRF being applied to interface must already exist in switch
               config. Ethernet port must be in routed mode. This functionality
               can also be handled in the VRF api.

           Args:
               name (str): The interface identifier.  It must be a full
                   interface name (ie Ethernet, not Et)
               vrf (str): The vrf name to be applied to the interface
               default (bool): Specifies the default value for VRF
               disable (bool): Specifies to disable VRF

           Returns:
               True if the operation succeeds otherwise False is returned

def set_vrf(self, name, vrf, default=False, disable=False):
        """Applies a VRF to the interface

           Note: VRF being applied to interface must already exist in switch
               config. Ethernet port must be in routed mode. This functionality
               can also be handled in the VRF api.

           Args:
               name (str): The interface identifier.  It must be a full
                   interface name (ie Ethernet, not Et)
               vrf (str): The vrf name to be applied to the interface
               default (bool): Specifies the default value for VRF
               disable (bool): Specifies to disable VRF

           Returns:
               True if the operation succeeds otherwise False is returned
        """
        commands = ['interface %s' % name]
        commands.append(self.command_builder('vrf forwarding', vrf,
                                             default=default, disable=disable))
        return self.configure(commands)