The index of the AALL IP prefix access list to use for route exports to the peer for this AFI/SAFI. Route export policy applies any export IP prefix access list before any export route map, and the route must be permitted by both to be exported. The export route map can apply its own prefix lists in addition to any export IP prefix access list. The peer may be configured to ignore this field and instead obtain the value from a peer-group as explained in the table description. Once a value has been chosen, then use it even if the IP prefix list does not exist.