Allied Telesis AlliedWare Plus Installation Manual page 200

Chapter 15: Troubleshooting
200
Verify that the AT-QSFPICU Cables are from Allied Telesis. The

trunk will not work with cables from another network equipment
manufacturer.
Verify that the ports on the AT-StackQS Cards are properly cabled.

The cables must crossover to different ports on the cards. Port 1
on the AT-StackQS Card in one switch must crossover to port 2 on
the card in another switch.
Verify that VCStack is activated on the switches. For instructions,

refer to Chapter 10, "Displaying the AlliedWare Plus Version
Number" on page 141.
If the switches are stacked with AT-StackQS Cards and AT-QSFPSR or
AT-QSFPLR4 Transceivers, try the following:
Verify that the AT-StackQS Cards are fully seated in the slots of

the back panels of the switches.
Verify that the transceivers are fully seated in the ports in the AT-

StackQS Cards.
Verify that the transceivers are from Allied Telesis. The trunk will

not work with transceivers from another network equipment
manufacturer.
For AT-QSFPSR Transceivers, verify that you are using 12-strand

OM4 fiber optic cable and that the cables are not longer than 150
m (492 ft).
For AT-QSFPLR4 Transceivers, verify that you are using SMF

cables and that the cables are in range of 2 m (6.6 ft) to 10 km (6.2
mi).
For AT-QSFPSR Transceivers, verify that the switches have

version 5.4.5-1 or later of the x930 operating system. For
instructions, refer to "Displaying the Hardware Status and
AlliedWare Plus Version Number" on page 145.
For AT-QSFPLR4 Transceivers, verify that the switches have

version 5.4.5-2 or later of the x930 operating system. For
instructions, refer to "Displaying the Hardware Status and
AlliedWare Plus Version Number" on page 145.
Verify that the ports on the AT-StackQS Cards are properly cabled.

The cables must crossover to different ports on the cards. Port 1
on the AT-StackQS Card in one switch must crossover to port 2 on
the card in another switch. For background information, refer to
"Trunks of AT-StackQS Cards" on page 64.
Verify that VCStack is activated on the switches. For instructions,

refer to Chapter 10, "Displaying the AlliedWare Plus Version
Number" on page 141.