topic Re: Catalyst 9800 - Interim update recommended setting in Wireless

Catalyst 9800 - Interim update recommended setting

Luna99923 — Sat, 22 Nov 2025 01:25:42 GMT

Hello,

I am looking for the recommended configuration for interim update interval on a Catalyst 9800 Wireless LAN Controller. We are currently running version 17.12.5 on our 9800s and use ISE 3.4. This is how we currently have the 9800s and Policy Profiles setup:

Thanks

Re: Catalyst 9800 - Interim update recommended setting

Mark Elsen — Sat, 22 Nov 2025 06:29:41 GMT

- @Luna99923 Recommended setting: Enabled with Interval set to 0
Behavior: Only send radius accounting update on IP address change

Re: Catalyst 9800 - Interim update recommended setting

neil-garry — Thu, 26 Mar 2026 12:29:44 GMT

Hi Mark,

Sorry to bring up an older post, but where exactly do you configure the accounting interim interval on the 9800?

We’re seeing a high volume of alerts from ISE, and I suspect it’s due to guest WiFi generating too many interim updates. I’ve had a look through the config but haven’t been able to find where the interval is actually set.

Thanks

Neil

Re: Catalyst 9800 - Interim update recommended setting

Mark Elsen — Thu, 26 Mar 2026 12:40:07 GMT

- @neil-garry FYI : https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/c9800-best-practices.html#RADIUSinterimaccounting