code: def set_vrf(self, name, vrf, default=False, disable=False):
          
          commands = ['interface %s' % name]
          commands.append(self.command_builder('vrf forwarding', vrf,
                                               default=default, disable=disable))
          return self.configure(commands)
docs: 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