Step 1 Use the show interfaces tokenring command to determine the status of the Token Ring interfaces. Step 2 If the status line indicates that the interface and line protocol are not up, check the cable from the router to the MAU or token ring switch. Make sure that the cable is in good condition. If it is not, replace it. Step 3 If you are performing a new installation, make sure that the MAU has been properly initialized. For information on initializing your MAU, refer to the manufacturer's documentation | Media Problems Token Ring Media Problem Suggested Actions Nonfunctional Token Ring Step 1 Use the show interfaces tokenring command to determine the status of the Token Ring interfaces. Step 2 If the status line indicates that the interface and line protocol are not up check the cable from the router to the MAU or token ring switch. Make sure that the cable is in good condition. If it is not replace it. Step 3 If you are performing a new installation make sure that the MAU has been properly initialized. For information on initializing your MAU refer to the manufacturer s documentation. Ring Speed Mismatch Step 1 Check the ring-speed specification on all nodes attached to the Token Ring backbone. The ring speed configured for all stations must be the same either 4 or 16 megabits per second Mbps . Use the show runningconfig privileged EXEC command to determine which speed is specified on the router. Step 2 If necessary modify ring-speed specifications for clients servers and routers. On routers use the ring-speed interface configuration command to change the ring speed. Change jumpers as needed for modular router platforms that do not support software speed configuration. For more information about ring-speed specifications refer to the hardware installation and maintenance manual for your system. Relay in MAU Step 1 If an open lobe fault message appears on the console at system power up check the cable connection to the MAU. Step 2 Use the clear interface privileged command to reset the Token Ring interface and reinsert the router into the ring. For all Token Ring cards except the CTR Token Ring card for the eBus controller on a Cisco 7500 series router and access routers you must use the clear interface command to reinitialize the Token Ring interface if the interface is down. Step 3 Use the show interfaces tokenring command to verify that the interface and line protocol are up. Step 4 If the interface is operational but the open lobe fault message persists and the
