> For the complete documentation index, see [llms.txt](https://help.highlight.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.highlight.net/getting-started/release-notes/26.9-september-2026.md).

# 26.9 - September 2026

Release Notes 26.9 for September 2026

### Summary

In **26.9** we've added a performance test to ICMP Polling to show latency, packet loss and jitter. We've also added support for Extreme Networks switches.

### ICMP Polling: Add a test for latency, packet loss and jitter

For ICMP Polling, use a [CSV](/getting-started/new-user/glossary.md#csvcomma_separated_values) file to upload IP addresses, with optional descriptions and locations. Highlight creates the locations and provides up/down status on the devices. You can alert and report on the availability of these devices.

In this release, you can optionally add a performance test to an ICMP Polling watch.  The parent ICMP watch shows up/down status on the Availability line.  The test shows additional metrics of latency, packet loss and jitter on a separate chart over time. Thresholds can be set for each metric with optional alerts sent if the threshold is breached.  

<figure><picture><source srcset="/files/utlqtoqO5phkRo9woKp8" media="(prefers-color-scheme: dark)"><img src="https://25768351-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F68Wb63XzG9guH74bkPEb%2Fuploads%2FYwg53tV4MYZEvfVPWrka%2FICMPPollTest%20-%20light.png?alt=media&amp;token=6444f360-6e96-456f-b4db-9da494a64d2c" alt="ICMP Polling Test "></picture><figcaption></figcaption></figure>

Find out more about [ICMP Polling](/admin/admin-page/controller.md#icmp-polling-main) and [performance tests](/details/details-pages/performance-charts.md#precision-delay-and-mos).&#x20;

### Extreme Networks: Switch support added

<div align="left"><figure><picture><source srcset="/files/dBmejSVEWC8dQPtDTada" media="(prefers-color-scheme: dark)"><img src="https://25768351-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F68Wb63XzG9guH74bkPEb%2Fuploads%2FGO5WKLNNXUIzmyULNhu6%2FExtremeLogo%20-%20light.svg?alt=media&amp;token=970c8c58-c3fb-4764-bfbb-ad1b11053689" alt="Extreme Networks logo"></picture><figcaption></figcaption></figure></div>

In addition to supporting Extreme Networks Wireless Access Points, switches can now be discovered and monitored via the Platform ONE API. &#x20;

Find out more about [Extreme Switches](/admin/admin-page/controller.md#extreme-networks-switches).&#x20;

### Bug fixes

* ICMP Polling: From the ICMP polling device dialog, there's now a link to the parent controller.

### Service description

The [Highlight Service Description document](/getting-started/new-user/service-description.md) concisely describes how Highlight works and its key features.&#x20;

### Browser compatibility

All Highlight releases are tested on the current version of:

* ![Chrome](https://support.highlight.net/help/images/browser_chrome.png)

  #### Chrome
* ![Edge](https://support.highlight.net/help/images/browser_edge.png)

  #### Edge
* ![Firefox](https://support.highlight.net/help/images/browser_ff.png)

  #### Firefox

Find out more about [Highlight supported browsers](/getting-started/useful-information/browsers-supported.md).

### Get in touch

More details on all of Highlight’s features are available on the Help & Support Centre or [contact us](/getting-started/contact-us.md) for assistance.


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