Troubleshooting The Discovery Process - Allied Telesis AT-9448Ts Installation Manual

Troubleshooting the Discovery Process

The easiest way to troubleshoot a stack that is unable to complete the
discovery process is by watching for error messages on the Terminal Port
of the master switch. Here are the steps:
1. Connect a terminal or a personal computer with a terminal emulation
program to the Terminal Port on the master switch, as explained in
"Starting a Local Management Session" on page 53.
2. Power on all of the switches in the stack. If the switches are already
powered on, power off a switch, wait a few seconds and then power it
back on again. Alternatively, disconnect and then reconnect a stacking
cable from a stacking module.
Possible error messages are:
More than maximum allowed number of switches.
The stack has too many switches. Remove one or more of the devices
after reviewing "Maximum Number of Switches in a Stack" on page 43.
Mixed module ID mode is not supported. Failed to form a
stack
Failed to elect a stack Master in the static mode.
Stack setup has failed.
The appearance of either of these messages could indicate that the stack
has both dynamic and static stack ID numbers. The ID numbers of a stack
must all be static or all dynamic. Resolving the problem requires
disconnecting the stacking cables from the switches and resetting the
numbers with the SET STACK command. For instructions, refer to the
AT-S63 Stack Command Line Interface User's Guide.
The second message could also indicate that there are no switches
numbered 1 or 2 in the stack, a problem that can only occur with static ID
numbers. A stack must have one switch assigned ID number 1 or 2.
Module ID conflict. Failed to form a stack
This message indicates that the same static ID number was assigned to
more than one switch. To resolve the issue, repeat the procedures
"Assigning the Static Module ID Number 1 to the Master Switch" on
page 58 and "Assigning a Static Module ID Number to the Member
Switches" on page 61. Alternatively, refer to the SET STACK command in
the AT-S63 Stack Command Line Interface User's Guide.
AT-9400 Stack Installation Guide
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