This read-only value, ranging from 0 to 3, reports which of up to four possible link numbers is currently being used for the LRM (LAN Reporting Mechanism) session between the SNMP host agent and a PCRouter card connected over the internal PCBus, when such a session is active. An administrator or diagnostic tool reads this to confirm which specific link slot the management session is actually using when troubleshooting communication between the host agent and the PCRouter card. For example, this object reading a value of 0 would indicate the LRM session is currently using the primary control link, link 0, between the host and the PCRouter.