Understanding 802.1X And Lldp And Lldp-Med On J-Ex Series Switches - Dell PowerConnect J-EX4200-24T Software Manual

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Understanding 802.1X and LLDP and LLDP-MED on J-EX Series Switches

The RADIUS accounting server logs these events as start-accounting or
3.
stop-accounting records. The records are in a file. On FreeRADIUS, the file name is
the server's address; for example, 122.69.1.250.
The accounting server sends an accounting-response packet back to the switch
4.
confirming it has received the accounting request.
If the switch does not receive a response from the server, it continues to send
5.
accounting requests until an accounting response is returned from the accounting
server.
The statistics collected through this process can be displayed from the RADIUS server;
to see those statistics, the user accesses the log file configured to receive them.
Example: Connecting a RADIUS Server for 802.1X to a J-EX Series Switch on page 2267
802.1X for J-EX Series Switches Overview on page 2253
Configuring 802.1X RADIUS Accounting (CLI Procedure) on page 2339
J-EX Series Switches use Link Layer Discovery Protocol (LLDP) and Link Layer Discovery
Protocol–Media Endpoint Discovery (LLDP-MED) to learn and distribute device
information on network links. The information allows the switch to quickly identify a
variety of devices, resulting in a LAN that interoperates smoothly and efficiently.
LLDP-capable devices transmit information in type, length, and value (TLV) messages
to neighbor devices. Device information can include specifics, such as chassis and port
identification and system name and system capabilities. The TLVs leverage this
information from parameters that have already been configured in the Junos OS.
LLDP-MED goes one step further, exchanging IP-telephony messages between the switch
and the IP telephone. These TLV messages provide detailed information on PoE policy.
The PoE Management TLVs let the switch ports advertise the power level and power
priority needed.
The switch also uses these protocols to ensure that voice traffic gets tagged and prioritized
with the correct values at the source itself. For example, 802.1p CoS and 802.1Q tag
information can be sent to the IP telephone.
J-EX Series switches support the following basic TLVs:
—The MAC address associated with the local system.
Chassis Identifier
—The port identification for the specified port in the local system.
Port identifier
Port Description —The user-configured port description. The port description can be a
maximum of 256 characters.
—The user-configured name of the local system. The system name can
System Name
be a maximum of 256 characters.
Chapter 81: 802.1X and MAC RADIUS Authentication Overview
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