Support Support Downloads Knowledge Base Juniper Support Portal Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

[WLA/WLC] Slow speed or poor wireless performance in 9.6 and 9.2 MSS_Versions



Article ID: KB33402 KB Last Updated: 03 Dec 2018Version: 1.0

This article provides a solution to overcome the issues like slow speed or poor wireless performance observed in 9.6 and 9.2 MSS_Versions.


Interface speed is only 54 Mb/s (expected was 130Mb/s). After experimenting with 11n radio settings short/long Guard Interval, discovered that 9.6/9.2 release of MSS_Versions does not support 802.11n. All wireless clients connect with the 802.11a or 802.11g band instead of 802.11an or 802.11ng. However, this issue does not appear in MSS_Version.


The 11n support must be disabled for a few RSN-IEs like WEP40/WEP104, which is followed from day one code. This code changes are present in SR and MRs (9.6/9.2).  They are not present in 9.1, so the issue would not be present in 9.1 MSS_Version.

The following releases of MSS_Version are fixed. We recommend upgrading the controllers to one of these:

  • MR9

  • MR6

Note: If you plan to upgrade the controllers from 8.0/9.0 MSS_Version, then upgrade the controllers to MSS_Version. Likewise, if you plan to upgrade the controllers from 9.1 MSS_Version then upgrade the controllers to MSS_Version.

Refer to the following links to save current configuration of the controller and to upgrade the controllers via Ringmaster/CLI/Webview:

Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search