Users Guide

To initiate 802.1x session re-authentication, the DAC sends a standard CoA request that contains one or more session
identification attributes. NAS uses the calling-station-id or the NAS-port attributes to identify a 802.1x user session. In case of
the EAP or MAB users, the MAC address is the calling-station-id of the supplicant and the NAS-port is the interface identifier. If
both these attributes are present in the CoA request, NAS retrieves the supplicant connected to the interface. The EAP or MAB
user sessions are re-authenticated and the NAS sends a CoA-Ack to the user, in case the re-authentication is successful.
1. Enter the following command to configure the dynamic authorization feature:
radius dynamic-auth
2. Enter the following command to configure the re-authentication of 802.1x sessions:
coa-reauthenticate
NAS re-initiates the user authentication state.
Dell(conf#)radius dynamic-auth
Dell(conf-dynamic-auth#)coa-reauthenticate
NAS takes the following actions whenever re-authentication is triggered:
● validates the CoA request and the session identification attributes.
● sends a CoA-Nak with an error-cause of 402 (missing attribute), if the CoA request does not contain both the calling-
station-id as well as the NAS-port attribute.
● sends a CoA-Ack if the re-authentication of the 802.1x session is successful.
● sends a CoA-Nak with an error-cause value of 506 (resource unavailable), if it is unable to initiate the re-authentication
process.
● sends a CoA-Nak if user authentication fails due to unresponsive supplicant or RADIUS server.
● sends a CoA-Ack, if the user is configured with static MAB profile.
● discards the packet, if simultaneous requests are received for the same calling-station-id or NAS-port or both.
● returns an error-cause value of 503 (session context not found), if it is not able to retrieve the session using the calling-
station-id or NAS-port attribute or both.
● sends NAK if user is configured with forced-unauthorization.
● sends-ACK if user is configured with forced-authorization.
Terminating the 802.1x user session
Dell EMC Networking OS provides RADIUS extension commands that terminate the 802.1x user session. When this request
is initiated, the NAS disconnects the 802.1x user session without disabling the physical port that authenticated the current
session.
Before terminating the 802.1x user session, ensure that the following prerequisites are satisfied:
● Shared key is configured in NAS for DAC.
● NAS server listens on the Management IP UDP port 3799 (default) or the port configured through CLI.
● The user is logged-in through 802.1X enabled physical port and successfully authenticated with Radius Server.
NAS uses the calling-station-id or the NAS-port attributes to identify the 802.1x session. In case of the EAP and MAB users,
the calling-station-id is the MAC address of the supplicant and the NAS-port attribute is the interface identifier. Using these
atrributes, the NAS retrieves the supplicant that is connected to the interface.
1. Enter the following command to configure the dynamic authorization feature:
radius dynamic-auth
2. Enter the following command to terminate the 802.1x user session:
terminate-session
NAS terminates the 802.1x user session without disabling the physical port.
Dell(conf#)radius dynamic-auth
Dell(conf-dynamic-auth#)terminate-session
NAS takes the following actions whenever session termination is triggered:
● validates the DM request and the session identification attributes.
● sends a DM-Nak with an error-cause of 402 (missing attribute), if the DM request does not contain the calling-station-id and
NAS-port attributes.
● returns an error-cause value of 503 (session context not found), if it is not able to retrieve the session using the calling-
station-id or NAS-port attribute or both.
● sends a DM-Ack, if it is able to terminate the session.
● sends a DM-Nak with an error-cause value of 506 (resource unavailable), if it is not able to apply changes to the existing
session.
816
Security