Communication Between Lldp-Enabled Devices; Lldp-Med - Enterasys C5G124-24 Configuration Manual

Figure 13-1
Discovery MIB
Port
ge. 1.1
ge. 1.2
ge. 1.4

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.

Communication between LLDP-enabled Devices

Device Info
IP phone x.x.x.x
PC x.x.x.x
IP switch x.x.x.x
I'm a
switch
I'm a
switch
Discovery MIB
Port Device Info
ge. 1.1 IP switch x.x.x.x
ge. 1.2 IP phone x.x.x.x
ge. 1.4 IP phone x.x.x.x
ge. 1.6 IP-PBX x.x.x.x
Fixed Switch Configuration Guide 13-3
Neighbor Discovery Overview
PSTN
I'm a
switch
I'm an
IP-PBX