This read-write value sets the administrative cost metric assigned to this trunk for path-selection purposes, ranging from 1 to 65,535, with lower-cost trunks preferred when the network's routing logic chooses among multiple possible paths for a circuit. An admin manually tunes this to steer traffic onto preferred trunks, for instance favoring a high-bandwidth fiber trunk over a lower-capacity backup path even if both are technically available, independent of the trunk's actual measured delay. For example, setting lportTrkAdminCost to 10 on a preferred high-capacity trunk and 1000 on a backup trunk ensures routing logic strongly favors the first trunk whenever both paths are viable options for a given circuit.