anchor.diff:     NEXT_TABLE name = variable
   ;
   
  +srt_passive
  +:
  +   PASSIVE
  +;
  +
   srt_readvertise
   :
      READVERTISE
  
positive.code: 
  rst_route_tail
  :
     srt_discard
     | srt_install
     | srt_next_hop
     | srt_next_table
     | srt_readvertise
     | srt_reject
     | srt_resolve
  
negative.code:    | rot_static
  ;
  
  srt_active
  :
     ACTIVE
  ;
  
  srt_discard
  :
     DISCARD
  