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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Configuring CoA to bounce 802.1x enabled ports

Dell EMC Networking OS provides RADIUS extension commands that enables you to configure port bounce settings for the 802.1x enabled port.

Before configuring port bounce settings on a 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.
When DAC initiates a port bounce operation, the NAS server causes the links on the authentication port to flap. This incident in turn triggers re-negotiation on one of the ports that is flapped.
  1. Enter the following command to configure the dynamic authorization feature:
    radius dynamic-auth
  2. Enter the following command to configure port-bounce setttings on a 802.1x enabled port:
    coa-bounce-port
    NAS disables the authentication port that is hosting the session and re-enables it after 10 seconds. All user sessions connected to this authentication port are affected.
Dell(conf#)radius dynamic-auth
Dell(conf-dynamic-auth#)coa-bounce-port
NAS takes the following actions whenever port-bounce 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 the NAS-port attributes.
  • uses the NAS-port attribute to identify the 802.1x enabled interface.
  • sends a CoA-Nak with an error-cause value of 503 (session context not found), if it is unable to retrieve 802.1x enabled interface using the NAS-port attribute.
  • sends a CoA-Ack if it is successfully able to flap the port.
  • discards the packet, if simultaneous requests are received for the same NAS Port.

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