This read-only integer reports the path cost advertised by the Designated Port of the LAN segment attached to this port, which the local bridge compares against the Root Path Cost field in received BPDUs to determine port roles for this VLAN. An administrator uses this value alongside the local root cost to understand why the spanning tree algorithm chose a particular port role, such as designated versus blocking, on this segment. For example, if a port unexpectedly remains blocking, the admin compares this designated cost to the local path cost to see why the neighboring bridge won the designated-port election.