Neighbor Discovery Overview
Fixed Switch Configuration Guide 13-3
Figure 13-1 Communication between LLDP-enabled Devices
LLDP-MED
The LLDP-Media Endpoint Discovery (LLDP-MED) extension of LLDP is defined to share
information between media endpoint devices such as IP telephones, media gateways, media
servers, and network connectivity devices.
Either LLDP or LLDP-MED, but not both, can be used on an interface between two devices. A
switch port uses LLDP-MED when it detects that an LLDP-MED device is connected to it.
LLDP-MED provides the following benefits:
• Auto discovery of LAN policies, such as VLAN ID, 802.1p priority, and Diffserv codepoint
settings, leading to plug-and-play networking.
• Device location and topology discovery, allowing creation of location databases and, in the
case of VoIP, provision of E911 services.
• Extended and automated power management of Power over Ethernet endpoints
• Inventory management, allowing network administrators to track their network devices and
to determine their characteristics, such as manufacturer, software and hardware versions, and
serial or asset numbers.
I’m a
switch
I’m a
switch
I’m a switch
I’m a switch
I’m a switch
I’m an IP phone
I’m an IP phone
I’m a PC
I’m a
switch
I’m an
IP-PBX
I’m an IP phone
I’m a switch
PSTN
Discovery MIB
Port Device Info
ge. 1.1
ge. 1.2
ge. 1.4
IP phone
PC
IP switch
x.x.x.x
x.x.x.x
x.x.x.x
Discovery MIB
Port Device Info
ge. 1.1
ge. 1.2
ge. 1.4
ge. 1.6
IP switch
IP phone
IP phone
IP-PBX
x.x.x.x
x.x.x.x
x.x.x.x
x.x.x.x
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