ISE license consumption and freeing licenses [RADIUS]

Hi people EHT,.

There are a lot of questions of ISE issued by me in the last time. And guess what - another here.

I wonder how the ISE license consumption and freeing licenses actually works. At least I have not find any good document or post on it.

From what I understand, a license (no matter if basic, plus, apex whatever) is consumed based on RADIUS accounting messages.

Example:

An endpoint is authenticating and allowed successfully with 802. 1 X without profiling or posture or whatever (simple). The ISE knows that this endpoint must use a base license and basic license consumption is increased by one.

As soon as the client is disconnected from the network, the n (switch, WLC) sends an accounting stop message to the ISE and the ISE again releases the base license.

(am I right so far?)

Assuming that I am just using the example above:

RADIUS is not say that really reliable. No matter that it uses UDP (which is unreliable), RAY has a mechanism of recognition built in (Accouting request / respone). But this mechanism gives up after a few attempts. Suppose that a client is disconnected, but the message of stop RADIUS is not received by the ISE.

Fact the endpoint stay forever in the State of the current session and therefore to consume a license forever? (Assume that there is no timer of dot1x re-authentication).

Or is it a mechanism of 'time-out' for endpoint licences?

Kind of a side story here:

I wrote a simple wrapper for the freeradius tool 'eapol_test '. Go Linux applications unique command line EAP (e.g., EAP - TLS) can be issued to a RADIUS server. If the Linux client acts as "supplicant" X 802.1 and authenticator. It's cool to quickly test the availability of the service of an authentication server.

My simple wrapper for "eapol_test" performs a ping 'EAP' at the time of convergence of measurement and measurement of authentications per second in a lab environment. The wrapper can also change endpoint of each session of RAY MAC. When I do ping EAP in a laboratory of my number of licenses on the ISE exploded, because eapol_test does not deliver messages from accounting RADIUS to EHT :)

Johannes has soon

Hi Johannes-

You're right about the consumption of license:

Licenses are counted against concurrent, active sessions. An active session is one for which a RADIUS Accounting Start is received but RADIUS Accounting Stop has not yet been received.
However, in addition to this:
Note Sessions without RADIUS activity are automatically purged from Active Session list every 5 days or if the endpoint is deleted from the system. 
This information used in the documentation of ISE 1.x, but for some reason, he is not :) in the 2.x here's the info from 1.2: http://www.cisco.com/c/en/us/td/docs/security/ise/1-2/installation_guide/ise_ig/ise_app_d_man_license.pdf I hope this helps! Thank you for the useful job evaluation!

Tags: Cisco Security

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