KB.15.15

Using fault recovery/troubleshooting tools

Stacking provides tools and logging information to aid in troubleshooting problems specific to

stacking. Problems may include:

• Installation/deployment issues

• Problems with initial stack creation

Problems with adding or removing members◦

◦ Booting an existing stack

• Stacking failures encountered while running an existing stack

The tools used in troubleshooting problems are:

• Event Log

• Show commands

Show stacking◦

◦ Show system

◦ Show boot history

• Show tech

• LEDs

Troubleshooting installation and deployment issues

Installation and deployment issues include the initial deployment or creation of a stack, as well as

adding additional members or removing members from a stack.

Problem:

When using the Deterministic method, one or more of the statically provisioned members did not

join the stack.

Possible reasons a switch does not join a stack are:

• The switch being added is already a member of another stack and has a different stack ID.

• The maximum number of switches is already configured.

• The switch being added has been statically provisioned. The MAC address matches, but the

switch type does not.

• There is a problem with the stack cable.

• The stack cables are connected in a way that creates an unsupported topology.

• Stack module failure.

Solution:

Perform a diagnostic fingerprint.

Troubleshooting issues with adding or removing members in the stack

Problem:

Cannot add a new switch to an existing stack.

304 Stack management for the 3800 switches