Allied Telesis AT-S63 - Manual (Page 46)

Chapter 1: Overview
46 Section I: Basic Operations
Troubleshooting the Discovery Process
The easiest way to troubleshoot a stack that is unable to complete the
discovery process is to watch 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 50.
2. Power on all the switches in the stack. If the switches are already
powered on, power off the master 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 28.
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.
These message could indicate that the switches of the stack have both
dynamic and static module ID numbers. A stack can have all static or all
dynamic numbers, but not a combination of the two. Resolving the
problem will require disconnecting the stacking cables from the switches
and resetting the numbers with the SET STACK command. For
instructions, refer to “SET STACK” on page 68.
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
module ID numbers. A stack must have at least one switch assigned
module ID number 1 or 2.
Module ID conflict. Failed to form a stack
This message indicates that two or more switches have the same static
module ID number. To resolve the issue, use the SET STACK command.
For instructions, refer to “SET STACK” on page 68.