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[EOL/EOE] [WLC] Clearing port-group configuration on the WLC controller



Article ID: KB32443 KB Last Updated: 04 Dec 2020Version: 2.0

Note: A product listed in this article has either reached hardware End of Life (EOL) OR software End of Engineering (EOE).  Refer to End of Life Products & Milestones for the EOL, EOE, and End of Support (EOS) dates.


Addition of port groups to a WLC controller may sometimes result in network stability issues such as port flapping and unstable WiFi connections. Clearing the port-group configuration on the WLC controller is one way to resolve these issues. This article explains how you can do so without causing any impact on the production network.

  • Port flapping 
  • Unstable WiFi connections

Perform the following steps to clear the port-group configuration without causing any impact on the production network:

  1. Connect to the WLC controller via a Console (Serial) connection.
    Note: The connection to your network will be disabled in the subsequent steps; therefore, it is required that a connection be made via a Console. 

  2. Take a backup of the controller configuration via TFTP.

    • Execute the following to save the current configuration:‚Äč
    WLC# save configuration <file-name>
    • Copy the file from MX/WLC (controller) to the TFTP server:
    copy <filename> tftp://<TFTP_IP>/<filename>

    Note: Ensure that the file is saved to the directory on the TFTP server as specified in the preceding command.

  3. Disable the port-group configuration:
    WLC# set port-group name <Port-group-name> port <port-ID> mode off
    WLC# set port-group name <Port-group-name> port <port-ID> mode off
  4. Map the management VLAN to the uplink port of the WLC controller and clear the management VLAN from the port group:
    WLC# set vlan <vlan-id> port <port-id> tag <tag-id>
    WLC# clear vlan <vlan-id> port <Port-group-name> tag <tag-id>
  5. Clear the port-group configuration:
WLC# clear port-group name <Port-group-name>


  • If the uplink ports of the EX switch in which the controllers are connected use Link Aggregation Control Protocol (LACP), port groups cannot be reconfigured on the WLC controller because the WLC controllers are not compatible with LACP.
  • However, if the requirement is to have a port-group configuration on the WLC controller, then the uplink ports of the EX switch must be modified to use static link aggregation group (LAG) after which the port groups can be reconfigured.
Modification History:

2020-12-04: Tagged article for EOL/EOE

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