Enterasys G3G170-24 - Configuring Link Layer Discovery Protocol and LLDP-MED; Overview; Purpose; Commands

Configuring Link Layer Discovery Protocol and LLDP-MED
Enterasys G-Series CLI Reference 3-13
Configuring Link Layer Discovery Protocol and LLDP-MED
Overview
TheLinkLayerDiscoveryProtocol(LLPD)issimilartotheEnterasysDiscoveryProtocolandthe
CiscoDiscoveryProtocolinthatitprovidesanindustrystandard,vendor‐neutralwaytoallow
networkdevicestoadvertisetheiridentitiesandcapabilitiesonalocalareanetwork,andto
discoverthatinformationabouttheirneighbors.
LLDP‐MEDisanenhancementtoLLDPthatprovidesthefollowingbenefits:
•Extendedanda utoma ted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
Theinformationsent
byanLLDP‐enableddeviceisextractedandtabulatedbyitspeers.The
communicationcanbedonewheninformationchangesoronaperiodicbasis.Theinformation
tabulatedisagedtoensurethatitiskeptuptodate.Portscanbeconfiguredtosendthis
information,receivethisinformation,or
bothsendandreceive.
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‐capabledeviceisconnectedtoit.
LLDPinformationiscontainedwithinaLinkLayerDiscoveryProtocolData
Unit(LLDPDU)sent
inasingle8 02.3Ethernetframe.TheinformationfieldsinLLDPDUareasequenceofshort,
variable‐length,informationelementsknownasTLVs—type,leng th,andvaluefieldswhere:
•Typeidentifieswhatkindofinformationisbeingsent
•Lengthindicates thelengthoftheinformation stringinoctets
•Valueistheactualinformationthatneedstobesent
TheLLDPstandardspecifiesthatcertainTLVs aremandatoryintransmittedLLDPDUs,while
othersareoptional.Youcanconfigureonaport‐specificbasiswhichoptionalLLDPandLLDP‐
MEDTLVsshouldbesentinLLDPDUs.
Purpose
ToreviewandconfigureLLPDandLLPD‐MED.
Commands
ThecommandsusedtoreviewandconfiguretheCDPdiscoveryprotocolarelistedbelow.
For information about... Refer to page...
show lldp 3-14
show lldp port status 3-15
show lldp port trap 3-16
show lldp port tx-tlv 3-16
show lldp port location-info 3-17
show lldp port local-info 3-17