Cisco Catalyst 3750-E Software Configuration Manual page 1291

Chapter 49 Troubleshooting
Troubleshooting Stackwise (Catalyst 3750-E Switches Only)
Table 49-5 Switch Stack Troubleshooting Scenarios
Symptom/problem
General troubleshooting of
switch stack issues
Switch cannot join stack
StackWise port frequently or
rapidly changing up/down states
(flapping)
Switch member port not coming
up
Reduced stack ring bandwidth,
or slow throughput between
switch ports or between switches
in the stack.
Port numbering in one or more
switches is incorrect or changed.
OL-9775-08
How to Verify Problem
Review this document.
Enter the show switch privileged EXEC
command.
Enter the show version user EXEC
command.
Enter the show platform stack-manager
all command.
Look carefully at the cables and
connections.
Enter the show sdm prefer command.
Error messages report stack link
problems. Possible traffic disruption.
Enter the show switch detail privileged
EXEC command.
Enter the show switch stack-ring speed
user EXEC command.
Enter the show switch detail user EXEC
command to see which stack cable or
connection is causing the problem.
Check the retainer screws on the
•
StackWise cable connectors.
Enter the show switch privileged
•
EXEC command to see whether new
switch shows as Ready, Progressing,
or Provisioned.
Enter the show switch detail user EXEC
command.
Possible Cause/Solution
Use the Troubleshooting Switch Stacks
document for problem solutions and tutorial
information.
Incompatible Cisco IOS versions between
stack members and new switch (see
Confirming Cisco IOS Versions).
Incompatible license levels in a Catalyst
3750-E switch (see Verifying Software License
Compatibility).
Incompatible Cisco IOS version numbers
between stack members and new switch (see
Confirming Cisco IOS Versions).
Unreliable StackWise cable or incomplete
connection (see Testing StackWise Cables and
Interfaces)
Configuration mismatch (that is, SDM
templates) if switch was used for other
applications before you added it to the stack.
Incompatible IOS version between stack
members and new switch (see Configuration
Mismatch).
Unreliable StackWise cable connection or
interface (see StackWise Port Flapping).
Unreliable StackWise cable connection or
interface (see StackWise Port Flapping).
Bad connection between StackWise cable
connection and switch chassis connector (see
Testing StackWise Cables and Interfaces).
Defective or missing StackWise cable (see
Testing StackWise Cables and Interfaces).
Loose retainer screws or overly tightened
•
retainer screws (see Verifying StackWise
Cable Connections).
• Check status of stack members (see
Verifying StackWise Cable Connections).
Multiple StackWise cables are disconnected
from stack members creating two separate
stacks. (see Stack Master Election and Port
Number Assignment).
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Troubleshooting Tables
49-33