anchor.diff:      | i_ip
       | i_mtu
       | i_no
  -    | i_null
       | i_shutdown
       | i_switchport
       | i_vrf_member
  
positive.code:   SWITCHPORT NEWLINE
  ;
  
  i_null
  :
    NO?
    (
      IP REDIRECTS
    ) null_rest_of_line
  ;
  
  
negative.code:   (
      i_no_autostate
      | i_no_bfd
      | i_no_null
      | i_no_shutdown
      | i_no_switchport
    )
  