topic Re: Mab authentication in domain Unknown after network device reboot in Network Access Control

Mab authentication in domain Unknown after network device reboot

SMD28316 — Tue, 01 Feb 2022 23:27:37 GMT

After a network device gets reloaded, I see that the endpoints not getting to the proper domain (voice or data) but they get placed in the unknown VLAN instead.

I can resolve this by manually doing a shut no sh to the interface, could the issue be related to stale sessions on the switch? Shouldn't they be cleared once rebooted?

Re: Mab authentication in domain Unknown after network device reboot

Damien Miller — Wed, 02 Feb 2022 04:43:58 GMT

Can you share the switch platform and software version you're running? It sounds like a bug I have seen.

Re: Mab authentication in domain Unknown after network device reboot

SMD28316 — Wed, 02 Feb 2022 07:21:48 GMT

I am having this issue with C9300, OS 17.6.2 , and 17.3.4

Re: Mab authentication in domain Unknown after network device reboot

balaji.bandi — Wed, 02 Feb 2022 07:38:50 GMT

Not sure is this your case - I may have encountered this past, is the configuration on the switch intact ? or was any config lost when it was rebooted?

Can you post the below output :

show auth sess

show auth sess interface x/x detailed

or this could be a bug as @Damien Miller mentioned..

Re: Mab authentication in domain Unknown after network device reboot

royce.varughese.1984 — Mon, 21 Jul 2025 02:00:49 GMT

Don't think this was resolved. Noticed same during a recent testing for MAB clients mainly. ISE did not report any issue but switch reported "Unknown" against domain.

Re: Mab authentication in domain Unknown after network device reboot

MHM Cisco World — Mon, 21 Jul 2025 02:13:25 GMT

Please make new post

MHM

Re: Mab authentication in domain Unknown after network device reboot

royce.varughese.1984 — Mon, 21 Jul 2025 02:36:06 GMT

Was trying to use an existing thread if that was okay to eliminate duplicate threads for same issues.

Re: Mab authentication in domain Unknown after network device reboot

balaji.bandi — Mon, 21 Jul 2025 07:07:34 GMT

i would expect to post more information - rather just unknown error.

ISE version

what switch Model and IOS Code ?

how does switch configuration look like ?

what kind of end device ?

what is ISE real time logs show ?

post switch debug output ?

Re: Mab authentication in domain Unknown after network device reboot

MHM Cisco World — Mon, 21 Jul 2025 09:35:03 GMT

I know but even if it solve here you can not close issue.

That why

Waiting you friend

MHM