This is the numeric identifier of the remote FCIP entity that this specific static route pertains to, paired with the WWN in the same table entry to fully identify the route's target. This identifier lets the routing table disambiguate between multiple statically-configured routes that might otherwise share overlapping address information but actually target logically distinct remote entities. Two static routes both pointing at IP addresses within the same remote data center's subnet could still be told apart by this identifier if they actually correspond to two separate FCIP entities running there.