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Christopher Rossetti
Cisco Employee
Cisco Employee

AP LED Disabled (CSCud76044) & CDP Disabled (CSCtq82437) Workaround

Introduction & Background

The document is intended to provide guidance to customers that need to execute workaround procedures related to the LED Disabled (CSCud76044) & CDP Disabled (CSCtq82437) side effects resulting from a change in the factory default recovery image being shipped.

The Cisco CAPWAP access points started to ship from the manufacturing factory with an updated recovery image based on the 15.2x AP IOS release. This updated recovery image has been optimized for the CUWN 7.3 controller release.

As part of these optimizations some subtle changes to the default/factory configuration structure are included. These default configuration optimizations have been observed to produce a couple of unexpected side effects when these APs do a CAPWAP JOIN/IMAGE/CFG to a CUWN 7.0 release track WLC. Namely, the default LED state and the CDP configuration on the Ethernet and Dot11Radio interfaces are erroneously disabled.

This document specifically outlines a simple method to correct these settings using an approach of bench staging the AP-s prior to deployment. Using a bench staging approach is not a requirement to correct these settings, as they can also be corrected using a production deployment WLC. Rather for certain customer deployments, the bench staging approach is applicable to minimize overhead observed during the deployment processes.

Cisco is working on an updated release of the CUWN WLC 7.0 version which will have AP software coding to handle the updated default/factory configuration for the LED & CDP issues. Once that release is available and the customer has certified it for their deployment, these workaround steps would not be necessary.

Workaround Procedures

The following steps can be leveraged as a workaround to fix the LED and CDP configuration for AP-s.

Step 1.Setup staging bench.

Step 1a. Setup a WLC with sufficient AP licensing to support the number of APs to be staged in respective batches

Recommended to setup the WLC with the expected deployment code in order to streamline the subsequent installation by virtue of preloading the AP image and mitigating another AP image download during installation.


config sysname AP-STAGE-WLC


config interface address management

config interface vlan management 0

! if ap-manager interface applicable

config interface address ap-manager config interface vlan ap-manager 0


(AP-STAGE-WLC) >show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.

Product Name..................................... Cisco Controller Product


RTOS Version.....................................

[ . . .]

System Name...................................... AP-STAGE-WLC

[ . . .]

Maximum number of APs supported.................. 50

[ . . .]

Step 1b. Setup a PoE switch with sufficient switchports & cables to support the number of APs to be staged in respective batches. The switch should be configured with a very simple topology and configuration.

Here is an example of a typical configuration:


       hostname AP-STAGE-SW


       no ip dhcp conflict logging


       ip dhcp excluded-address


       ip dhcp pool AP-STAGE



           lease 0 1


       interface Vlan1

         ip address

         no shutdown


       interface range GigabitEthernet0/1 -24


         switchport mode access

         switchport access vlan 1

         spanning-tree portfast

         spanning-tree bpduguard enable

         no shutdown


Step 2. Connect batch of AP-s to staging bench.

- Observe AP booting. LEDs will change as AP downloads full AP IOS from WLC and then reboots. Typically takes about 5mins on a per AP basis, although AP downloads will be happening in parallel.

- Given CSCud76044, the LED are expected to be disabled/off once the AP has fully CAPWAP JOINed the WLC. Given CSCtq82437, CDP on the AP Ethernet port might or might not be working depending if multiple reboots of the AP occur as part of staging activities.

- Note: Be sure to wait for the APs to download the image, typically 2‐5 minutes. The AP will reboot after new image download and join back the controller. As a sanity check, use the WLC GUI to confirm there are no APs in the downloading state and that all APs have JOINed the WLC. Issue a WLC CLI "show ap image all" and confirm all APs have a Primary image which matches the WLC image.

Step 3. Using WLC CLI session, issue CSCud76044 LED configuration workaround commands.

Step 3a. “config ap led-state enable all”

            - Observe AP LED and ensure that ALL staged APs are operating correctly.

Step 4. Using WLC CLI session, issue CSCtq82437 CDP configuration workaround commands.

Step 4a. “config ap cdp enable all”

Step 4b. “config ap cdp interface ethernet 0 enable all”

            - Observe using the PoE switch to check “show cdp neighbor” to confirm all APs are showing up correctly.

Step 4c. “config ap cdp interface slot 0 enable all”

Step 4d. “config ap cdp interface slot 1 enable all”

Step 5. Reload all APs and allow them to rejoin with config workaround and full AP IOS release.

Step 5a. Various methods to reload, eg on PoE switch:


           configure terminal

             interface range GigabitEthernet0/1 -24

               power inline never

               power inline auto



- After APs have returned to service:

- Observe AP LEDs and ensure that ALL staged AP-s are operating correctly.

- Observe using the PoE switch to check “show cdp neighbor” to confirm all APs are showing up correctly.

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