This TruthValue field reports whether Fibre Channel link autonegotiation is enabled on this direct-attached FC storage port's underlying link. For one physical FC port on the fabric interconnect that is a member of a direct-attached (non-SAN-switch) external storage connection, this setting has to match on both ends of the cable — a mismatch (one side forced, the other auto) is one of the classic causes of a link that comes up but runs at a lower speed than expected or drops frames under load. A value of 'true' here means this FC port is letting the far-end device negotiate link speed automatically rather than being pinned to one fixed FC speed by an admin.