This release notes document describes features, enhancements, and caveats for the Cisco Aironet 1800s Active Sensor using the Cisco Wireless Release These release notes are updated as needed to provide information about new features, caveats, potential software deferrals, and related documents.


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Overview of Cisco Aironet 1800s Active Sensor

The Cisco Aironet 1800s Active Sensor is a part of Cisco's Wireless Service Assurance solution. The Wireless Service Assurance platform has three components, namely, Wireless Performance Analytics, Real-time Client Troubleshooting, and Proactive Health Assessment.

The Cisco Aironet 1800s Active Sensor is referred to as the Network Sensor, or sensor in this document.

The Cisco Aironet 1800s Active Sensor is an 802.11 a/b/g/n/ac (Wave 2) sensor, with internal antennas and an Ethernet backhaul. The sensor can be mounted, in a vertical orientation, on a wall or a desk and supports 2x2:2 SS MU-MIMO applications. The sensor is capable of joining an infrastructure access point as a client. The sensor can be used to monitor, measure, and troubleshoot overall wireless network performance.

What's New in Cisco Wireless Release

The following section provides a brief introduction to the new features and enhancements that are introduced in this release:

Error Codes

Error codes are designed for onboarding and all Cisco Wireless Service Assurance application tests that can be configured using the Cisco DNA Center. When the test fails, the sensor will send the error code to Cisco DNA Center and this will be displayed along with the test results. The error code will be converted to a human readable string and displayed on the Cisco DNA Center.

There are four categories of error codes for the sensor onboarding process:

  • Reason codes: Category of error codes resulting from disassociation and deauthentication message

  • Status codes: Category of error codes resulting from authentication and association failure

  • DHCP state: Category of error codes resulting from IP address failure

  • Category of specific error codes resulting from individual authentication and EAP type. It has the following sub-categories:

    • PSK key mismatch

    • EAP MSCHAPv2 failure

    • EAP SSL/TLS failure

    • PEAP failure

    • EAP Events

    • EAP TLS

Hidden SSID

Hidden SSID is supported on both kinds of SSID configuration, backhaul SSID and test SSID. The Cisco DNA Center will send the backhaul SSID to connect as part of provisioning. The test SSID is configured once the Cisco Aironet 1800s Active Sensor is onboarded to the Cisco DNA Center through the enrollment process.


Beginning with Cisco Wireless Release, onboarding will be run once for a given set of tests that share the following set of common criteria:

  • SSID

  • AP (BSSID)

  • Radio (band)

  • Test frequency rate

The above criteria define a unique onboarding event. Once onboarding is done for tests that share the same criteria, then all tests will be executed, and the results will be sent to the Cisco DNA Center.

This improves the efficiency compared to the previous onboarding scheme when multiple tests were run against the same SSID, BSSID, radio etc., where each test had an explicit onboarding event.


Caveats describe unexpected behavior in the Cisco Wireless Network Sensor software. Severity 1 caveats are the most serious while Severity 2 caveats are less serious.

The Resolved Caveats and Open Caveats sections list the caveats in the Cisco Wireless Release The following information is provided for each caveat:

  • Identifier—Each caveat is assigned a unique identifier (ID) with a pattern of CSCxxNNNNN, where x is any letter (a-z) and N is any number (0-9). These IDs are frequently referenced in Cisco documentation, such as Security Advisories, Field Notices and other Cisco support documents. Technical Assistance Center (TAC) engineers or other Cisco staff can also provide you with the ID for a specific caveat.

  • Description—A description of what is observed when the caveat occurs.

Cisco Bug Search Tool

The Cisco Bug Search Tool (BST), which is the online successor to the Bug Toolkit, is designed to improve the effectiveness in network risk management and device troubleshooting. The BST allows partners and customers to search for software bugs based on product, release, and keyword, and aggregates key data, such as bug details, product, and version. The tool has a provision to filter bugs based on credentials to provide external and internal bug views for the search input.

For more information about how to use the Cisco Bug Search Tool effectively, including how to set email alerts for bugs, filter bugs, and save bugs and searches, see the Bug Search Tool Help & FAQ page.

You can access the listed bugs through the BST. This web-based tool provides you access to the Cisco bug tracking system, which maintains information about bugs and vulnerabilities in the Cisco Wireless Network Sensor software and other Cisco hardware and software products.

Click the Caveat Identifier number in the table. The corresponding BST page is displayed with details of the bug.


If you are not logged in, you will be redirected to a Log In page where you need to enter your registered username and password to log In. If you do not have a account, you can register for one.

If the defect that you have selected cannot be displayed, this may be due to one or more of the following reasons:

  • The defect number does not exist

  • The defect does not have a customer-visible description yet

  • The defect has been marked Cisco Confidential

Open Caveats

This section lists the open caveats in Cisco Wireless Release These caveats apply to the current release and may apply to previous releases. A caveat that is open for a prior release and is still unresolved applies to all future releases until it is resolved.

Table 1. Cisco Aironet Network Sensor: Open Caveats in Cisco Wireless Release

Caveat Identifier

Caveat Description


Sensor: EAP-TLS cert works even when Microsoft Windows client does not work with sensor


Sensor: IPSLA test failed due to no response from AP


Sensor: Image upgrade in bad RF condition causes PCF and intermittent red X outdate

Resolved Caveats

This section lists the caveats that have been resolved in Cisco Wireless Release

Table 2. Cisco Aironet Network Sensor: Resolved Caveats in Cisco Wireless Release

Caveat Identifier

Caveat Description


AP1800S may reboot to OOM on running all tests


Sensor does not recover from HEARTBEAT FAILURE after Cisco DNA Center software upgrade from Release 1.2.4 to Release 1.2.5


Cisco DNA Center Release 1.2.6: Sensor EAP-FAST test reports slow-onboarding


Web-server test fails for web authentication enabled SSID


Cisco Aironet 1800s Active Sensor upgrade times out and software image check fails


DHCP option 60 does not work with Cisco Aironet 1800s Active Sensor


Cisco DNA Center Release 1.2.10 : Sensors fails to connect to SSID sometimes resulting in onboarding failure


Manual PNP server configuration fails on Cisco Aironet 1800s Active Sensor


Sensor: PCF and intermittent red X outdate block users from upgrading the software image


AP as a sensor is not working with unicode values

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Cisco Bug Search Tool

Cisco Bug Search Tool (BST) is a web-based tool that acts as a gateway to the Cisco bug tracking system that maintains a comprehensive list of defects and vulnerabilities in Cisco products and software. BST provides you with detailed defect information about your products and software.