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.
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.
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:
no ip dhcp conflict logging
ip dhcp excluded-address 10.0.0.0 10.0.0.19
ip dhcp pool AP-STAGE
network 10.0.0.0 255.255.255.0
lease 0 1
ip address 10.0.0.254 255.255.255.0
interface range GigabitEthernet0/1 -24
switchport mode access
switchport access vlan 1
spanning-tree bpduguard enable
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.