Deployment Guide

● discards the packet, if simultaneous requests are received for the same NAS-port or calling-station-id, or both.
Disabling 802.1x enabled port
Dell EMC Networking OS provides RADIUS extension commands that enables you to disable 802.1x enabled ports. This
command administratively shuts down the port causing the termination of the dot1x user session. This command is useful
when a port is known to cause issue in the network and needs to be disabled.
Before disabling the 802.1x enabled port, 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.
To initiate shutting down of the 802.1x enabled port, the DAC sends a standard CoA request that contains one or more session
identification attributes. NAS uses the NAS-port attributes to identify the 802.1x enabled physical port.
1. Enter the following command to configure the dynamic authorization feature:
radius dynamic-auth
2. Enter the following command to disable the 802.1x enabled physical port:
coa-disable-port
NAS administratively shuts down the 802.1x enabled port that is hosting the session. You can re-enable this port only
through a non-RADIUS mechanism or through bounce-port request.
Dell(conf#)radius dynamic-auth
Dell(conf-dynamic-auth#)coa-disable-port
NAS takes the following actions:
● 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 the NAS-port attribute.
● returns an error-cause value of 503 (session context not found), if it is not able to retrieve the port information using the
NAS-port attribute.
● sends a CoA-Ack, if it is able to successfully disable the 802.1x enabled port.
● sends a CoA-Nak with an error-cause value of 506 (resource unavailable), if it is not able to disable the 802.1x enabled port.
● discards the packet, if simultaneous requests are received for the same NAS Port.
Important points to remember
Virtual link truncking (VLT) scenario
This section describes how the secondary NAS processes the PE port authorization RADIUS requests to the primary NAS.
● The NAS VLT chassis member processes the RADIUS dynamic authorization message locally if the role of chassis is primary.
● The NAS secondary VLT chassis member forwards the RADIUS dynamic authorization message authorizing dual-homed Port
Extender (PE) ports to the primary VLT peer. NAS secondary VLT chassis member forwards the response to DAC after
receiving it from the primary VLT peer.
● The NAS VLT secondary chassis member processes the RADIUS dynamic authorization message authorizing non-PE Control
Bridge (CB) ports locally.
RPM failover scenario
This section describes how the NAS handles virtual IP failovers to the secondary RPM.
● The NAS Route Processor Module (RPM) processes the RADIUS dynamic authorization message only if the role of RPM is
active.
● The NAS standby RPM processes the retransmitted CoA or DM messages without requiring a chassis reboot if primary RPM
fails and standby becomes primary.
760
Security