The index of the AALL IP prefix access list to use for route imports from the peer for this AFI/SAFI. Route import policy applies any import IP prefix access list before any import route map, and the route must be permitted by both to be imported. The import route map can apply its own prefix lists in addition to any import 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. Route import uses a single import IP prefix access list chosen as follows. - If using the peer group value, then use that. - If using the peer value and it is non-zero, then use that. - If using the peer value and it is zero, then fallback on using the peer group value if the peer is a member of a peer group. Once a value has been chosen, then use it even if the IP prefix list does not exist.