Preventing Switch Stack Problems - Cisco WS-C3750-48PS-S Software Configuration Manual

Preventing Switch Stack Problems

Write the running configuration to the startup configuration file:
Step 9
Switch# copy running-config startup-config
The new password is now in the startup configuration.
Note
Step 10 You must now reconfigure the switch. If the system administrator has the backup switch and VLAN
configuration files available, you should use those.
Preventing Switch Stack Problems
Note •
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If you replace a stack member with an identical model, the new switch functions with the exact same
configuration as the replaced switch. This is also assuming the new switch is using the same member
number as the replaced switch.
Removing powered-on stack members causes the switch stack to divide (partition) into two or more
switch stacks, each with the same configuration. If you want the switch stacks to remain separate, change
the IP address or addresses of the newly created switch stacks. To recover from a partitioned switch
stack:
1.
2.
3.
Catalyst 3750 Switch Software Configuration Guide
39-8
This procedure is likely to leave your switch virtual interface in a shutdown state. You can see
which interface is in this state by entering the show running-config privileged EXEC command.
To re-enable the interface, enter the interface vlan vlan-id global configuration command, and
specify the VLAN ID of the shutdown interface. With the switch in interface configuration
mode, enter the no shutdown command.
Make sure the switches that you add to or remove from the switch stack are powered off. For all
powering considerations in switch stacks, refer to the "Switch Installation" chapter in the hardware
installation guide.
After adding or removing stack members, make sure that the switch stack is operating at full
bandwidth (32 Gbps). Press the Mode button on a stack member until the Stack mode LED is on.
The last two port LEDs on the switch should be green. Depending on the switch model, the last two
ports are either 10/100/1000 ports or small form-factor pluggable (SFP) module ports. If one or both
of the last two port LEDs are not green, the stack is not operating at full bandwidth.
We recommend using only one CLI session when managing the switch stack. Be careful when using
multiple CLI sessions to the stack master. Commands that you enter in one session are not displayed
in the other sessions. Therefore, it is possible that you might not be able to identify the session from
which you entered a command.
Manually assigning stack member numbers according to the placement of the switches in the stack
can make it easier to remotely troubleshoot the switch stack. However, you need to remember that
the switches have manually assigned numbers if you add, remove, or rearrange switches later. Use
the switch current-stack-member-number renumber new-stack-member-number global
configuration command to manually assign a stack member number. For more information about
stack member numbers, see the
Power off the newly created switch stacks.
Reconnect them to the original switch stack through their StackWise ports.
Power on the switches.
"Stack Member Numbers" section on page
Chapter 39 Troubleshooting
5-6.
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