Value INTERFACE (\S+)
Value ADM (Up|Down)
Value OPR (Up|Down)
Value DR ((\d+\.\d+\.\d+\.\d+|[0-9a-f:]*)|N/A)
Value DR_PRTY (\d+|N/A)
Value HELLO_INTVL (\d+)
Value MCAST_SEND (\S+)

Start
  ^----------- -> Interface

Interface
  ^${INTERFACE}\s+${ADM}\s+${OPR}\s+${DR_PRTY}\s+${HELLO_INTVL}\s+${MCAST_SEND}(\s|$$) -> Dr

Dr
  ^\s+${DR}(\s|$$) -> Record Interface
  ^No.\s+of\s+Interfaces
  ^-----------
  ^\s*$$
  ^. -> Error
