Specifications

Understanding Neighbor Discovery
October 15, 2008 Page 3 of 14
Figure 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.ThisissupportedonEnterasysMatrixN‐Series
devices
only.
•Devicelocationandtopologydiscovery,allowingcreationoflocationdatabasesand,inthe
caseofVoIP ,provisionofE911services.ThisissupportedonEnterasysMatrixN‐Series
devicesonly.
•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