anchor.diff:  	| aggregate_address_rb_stanza
   	| cluster_id_bgp_rb_stanza
   	| default_metric_rb_stanza
  +	| neighbor_description_rb_stanza
   	| neighbor_ebgp_multihop_rb_stanza
   	| neighbor_next_hop_self_rb_stanza
   	| neighbor_peer_group_creation_rb_stanza
  
positive.code: 						| VARIABLE
  					)
  					(
  						DESCRIPTION
  						| FALL_OVER
  						| PASSWORD
  						| REMOVE_PRIVATE_AS
  						| SOFT_RECONFIGURATION
  
negative.code: 	) ACTIVATE NEWLINE
  ;
  
  neighbor_description_rb_stanza
  :
     NEIGHBOR ( IP_ADDRESS | IPV6_ADDRESS ) DESCRIPTION (text+=M_DESCRIPTION_NON_NEWLINE)* M_DESCRIPTION_NEWLINE
  ;
  
  neighbor_ebgp_multihop_rb_stanza
  :
  	NEIGHBOR
  