anchor.diff:     | network_bgp_tail
      | network6_bgp_tail
      | next_hop_self_bgp_tail
  +   | no_network_bgp_tail
      | null_bgp_tail
      | prefix_list_bgp_tail
      | redistribute_aggregate_bgp_tail
  
positive.code: address_family_footer
  :
     (
        EXIT_ADDRESS_FAMILY NEWLINE
     )?
  ;
  
  
negative.code:          | peergroup = ~( IP_ADDRESS | IPV6_ADDRESS | NEWLINE )
        ) NO SHUTDOWN NEWLINE
     )
  ;
  
  no_network_bgp_tail
  :
     NO NETWORK ~NEWLINE* NEWLINE
  ;
  
  no_redistribute_connected_rb_stanza
  