Allied Telesis AlliedWare Plus x950 Series Installation Manual page 202

Chapter 13: Troubleshooting
202
 Verify that the network device operates at a speed supported by
the card. The ports on the AT-XEM2-12XT Card support 100Mbps
and 1/10Gbps. The ports on the AT-XEM2-12XTm Card support
100Mbps and 1/2.5/5/10Gbps. The cards do not support 10Mbps
devices.

If the AT-XEM2-12XT Card cannot establish links with 100Mbps
devices, the switch might have an earlier version of the AlliedWare
Plus management software. Support for 100Mbps devices on the
AT-XEM2-12XT Card was added in version 5.4.9-1. Use the
SHOW VERSION command to display the version number. If
necessary, update the management software.
 Try connecting another network device to the twisted pair port with
a different cable. If the twisted pair port is able to establish a link,
then the problem is with the cable or the other network device.

Verify that the twisted pair cable does not exceed 100 meters (328
feet).
 Verify that you are using the appropriate category of twisted pair
cable. Refer to Table 8 on page 32 and Table 10 on page 34.

Verify that the port is connected to the correct twisted pair cable.
Note
An 1GBase/10GBase connection may require five to ten seconds to
establish a link.
Problem 9: The SHOW STACK command is not displaying all the
switches in the stack.
Solutions: The switches are unable to form the stack. Try the following:
 The switches might have an earlier version of the management
software that does not support VCStack, or they might have
different versions. The version must be 5.4.8-2 or later. You can
view the version number with the SHOW VERSION command.
 Review the information in "Stack Trunks" on page 56 to verify that
the trunk complies with all rules and restrictions.

If the trunk is using fiber optic transceivers, verify that they are fully
inserted into the ports.
 Verify that the transceivers are from Allied Telesis.
 Verify that the fiber optic cables are securely connected to the
ports on the transceivers.

Display the running configurations and confirm the ports of the
stack trunk. They are identified by the STACKPORT command. In
this example from a running configuration, ports 1 to 4 are the
stack trunk:
interface port1.0.1-1.0.4