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Catalyst 3750 Switch Software Configuration Guide
OL-8550-09
Chapter 5 Managing Switch Stacks
Troubleshooting Stacks
• A stack is in the full-ring state when all members are connected through the StackWise ports and
are in the ready state.
• The stack is in the partial-ring state when
–
All members are connected through the StackWise ports, but some all are not in the ready state.
–
Some members are not connected through the StackWise ports.
When you enter the switch stack-member-number stack port port-number disable privileged EXEC
command and
• The stack is in the full-ring state, you can disable only one StackWise port. This message appears:
Enabling/disabling a stack port may cause undesired stack changes. Continue?[confirm]
• The stack is in the partial-ring state, you cannot disable the port. This message appears:
Disabling stack port not allowed with current stack configuration.
Re-Enabling a StackWise Port While Another Member Starts
StackWise Port 1 on Switch 1 is connected to Port 2 on Switch 4. If Port 1 is flapping, disable Port 1
with the switch 1 stack port 1 disable privileged EXEC command.
While Port 1 on Switch 1 is disabled and Switch 1 is still powered on:
1. Disconnect the stack cable between Port 1 on Switch 1 and Port 2 on Switch 4.
2. Remove Switch 4 from the stack.
3. Add a switch to replace Switch 4 and assign it switch-number 4.
4. Reconnect the cable between Port 1 on Switch 1 and Port 2 on Switch 4 (the replacement switch).
5. Re-enable the link between the switches. Enter the switch 1 stack port 1 enable privileged EXEC
command to enable Port 1 on Switch 1.
6. Power on Switch 4.
Caution Powering on Switch 4 before enabling the Port 1 on Switch 1 might cause one of the switches to reload.
If Switch 4 is powered on first, you might need to enter the switch 1 stack port 1 enable and the switch
4 stack port 2 enable privileged EXEC commands to bring up the link.
Understanding the show switch stack-ports summary Output
Only Port 1 on stack member 2 is disabled.
Switch# show switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 3 50 cm Yes Yes Yes 1 No
1/2 Down None 3 m Yes No Yes 1 No
2/1 Down None 3 m Yes No Yes 1 No
2/2 OK 3 50 cm Yes Yes Yes 1 No
3/1 OK 2 50 cm Yes Yes Yes 1 No
3/2 OK 1 50 cm Yes Yes Yes 1 No