Understanding 802.1X and LLDP and LLDP-MED on EX Series Switches
Juniper Networks EX Series Ethernet 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 Juniper Networks
Junos operating system (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.
EX Series switches support the following basic TLVs:
•
Chassis Identifier
—The MAC address associated with the local system.
•
Port identifier
—The port identification for the specified port in the local system.
•
Port Description
—The user-configured port description. The port description can be a
maximum of 256 characters.
•
System Name
—The user-configured name of the local system. The system name can
be a maximum of 256 characters.
•
System Description
—The system description containing information about the software
and current image running on the system. This information is not configurable, but
taken from the software.
•
System Capabilities
—The primary function performed by the system. The capabilities
that system supports; for example, bridge or router. This information is not configurable,
but based on the model of the product.
•
Management Address
—The IP management address of the local system.
EX Series switches support the following 802.3 TLVs:
•
Power via MDI
—A TLV that advertises MDI power support, PSE power pair, and power
class information.
•
MAC/PHY Configuration Status
—A TLV that advertises information about the physical
interface, such as autonegotiation status and support and MAU type. The information
is not configurable, but based on the physical interface structure.
Copyright © 2010, Juniper Networks, Inc.
2540
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...
