Recovering from a stack unit configuration mismatch

When a configuration mismatch occurs, the active controller logs and displays a configuration mismatch message and puts the mismatched unit into a non-operational state. In the following example, the original stack unit 3 has failed, and a replacement unit has been installed that does not match the configuration of the original unit. You should see the following message.

Warning! put stack unit 3 to non-operational reason= config mismatch

Complete the following steps to recover from a configuration mismatch.

Enter the show stack command to see the status of the stack, and the show running-config command to see the configurations of the stack units.

ICX7750-26Q Router# show stack
T=1h38m40.5: alone: standalone, D: dynamic cfg, S: static
ID   Type          Role    Mac Address    Pri State   Comment
1  S ICX7750-20QXG active  748e.f8f9.6300   0 local   Ready
2  D ICX7750-20QXG member  cc4e.2438.7280   0 remote  Ready
3  S ICX7750-20QXG member  cc4e.2438.7500   0 remote  NON-OP: config mismatch

ICX7750-26Q Router# show running-config
Current configuration:
!
ver 08.0.40b1T203
!
stack unit 1
  module 1 icx7750-20-qxg-port-management-module
  module 2 icx7750-qsfp-6port-qsfp-240g-module
  module 3 icx7750-6q-6port-qsfp-240g-module
  stack-trunk 1/2/1 to 1/2/2
  stack-trunk 1/2/4 to 1/2/6
  stack-port 1/2/1 1/2/4
stack unit 2
  module 1 icx7750-20-qxg-port-management-module
  module 2 icx7750-qsfp-6port-qsfp-240g-module
  module 3 icx7750-6q-6port-qsfp-240g-module
  stack-trunk 2/2/4 to 2/2/5
  stack-port 2/2/1 2/2/4
stack unit 3
  module 1 icx7750-48-xgc-port-management-module
  module 2 icx7750-qsfp-6port-qsfp-240g-module
  stack-port 3/2/1 3/2/4
stack enable
stack mac 748e.f8f9.6300
!

To resolve the mismatch, you must remove the configuration for stack unit 3. Use the no stack unit command in configuration mode.
```
device# configure terminal
device(config)# no stack unit 3
```
This removes configuration related to unit 3.

If you are unable to remove the configuration because of a multi-slot trunk configuration or other configuration identified by system output, you must first manually remove the problem configuration.

When you have successfully deleted the mismatched stack unit, a re-election is triggered, and the active controller learns the correct module configuration from the standby controller or from other stack members. No reload is required.

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Recovering from a stack unit configuration mismatch