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[WLA/WLC] Radio 2 does not function as expected on a WLA322-WW and WLA321-WW Access Points

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Article ID: KB31406 KB Last Updated: 12 Jan 2018Version: 1.0
Summary:

This article explains how to recover Radio 2 from failure or frequent reset on a random WLA322-WW and WLA321-WW Access Points.

Symptoms:
  1. Frequent Radio reset in Radio 1 (2.4 GHz).

  2. SSID not beaconing for Non-DFS channels (36, 40, 44, and 48) in Radio 2 (5 GHz) and LED behavior of the affecting AP will be glowing with alternate green and amber color.

  3. SSID not beaconing for initial time for DFS channels (52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140) alone in Radio 2 (5 GHz).


In DFS-channels, LED flashes for a few minutes (1 – 10 Minutes), during which the SSID is not broadcasted. After that minute, the SSID appears and connection is OK only in DFS channels (52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, and 140).
Solution:
  • The code is optimized in order not to revert the CE compliance changes completely but the values has been changed at the register levels.

  • MSS_Version 9.6 SR (Service Release) is available to fix the issue involved with Radio reset on Radio 1 and Non-DFS channels. Please contact JTAC for MSS_Version 9.6 SR (Service Release).

  •  Maintenance Release is not possible because the issue was related to “EU” regulations and it will impact other users. Juniper is working on further SR releases for any issues re-ported on current SR release.


DFS channels:

DFS Channel Availability Check times for Weather radar channels and non-weather radar channels are different.

For countries in the EU regulatory domain, when a DFS channel of 120,122,124,126, or 128 (i.e. 5600 to 5650 Mhz) is used, then the CAC time will be 10 minutes.

For other DFS channels outside this range, the CAC time will be 1 min. This requirement is independent of the country code in the EU domain.

Here is an extract from the standard for your quick reference:



Please Read: Channel Availability Check Time and NOTE 1.

Hence, the observation seen during testing for the DFS channels is expected and in accordance with the latest ETSI standard (EN 301 893 (v2.0.7) (2016)).

 
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