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{{IPstack}}
The '''Link Layer Discovery Protocol''' ('''LLDP''') is a vendor-neutral [[link layer]] protocol used by [[network
|title=802.1AB-REV - Station and Media Access Control Connectivity Discovery
|url=http://www.ieee802.org/1/pages/802.1AB-rev.html
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==Information gathered==
Information gathered with LLDP can be stored in the device [[Management information base|management information database]] (MIB) and queried with the [[Simple Network Management Protocol]] (SNMP) as specified in [[Request for Comments|RFC]] 2922. The topology of an LLDP-enabled network can be discovered by ''crawling'' the hosts and querying this database. Information that may be retrieved include:
* System name and description
* [[Port (computer networking)|Port]] name and description
* [[VLAN]] name
* IP management address
* System capabilities ([[Network switch|switching]], [[routing]], etc.)
* [[Medium access control|MAC]]/[[PHY]] information
* [[Power over Ethernet|MDI power]]
* [[Link aggregation]]
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==Applications==
{{expand section|date=December 2018}}
The Link Layer Discovery Protocol may be used as a component in [[network management]] and [[network monitoring]] applications.
One such example is its use in [[data center bridging]] requirements. The {{visible anchor|'''Data Center Bridging Capabilities Exchange Protocol'''}} (DCBX) is a discovery and capability exchange protocol that is used for conveying capabilities and configuration of the above features between neighbors to ensure consistent configuration across the network.<ref>{{cite web
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}}</ref>
LLDP is used to advertise [[power over Ethernet]] capabilities and requirements and negotiate power delivery.
==Frame structure==
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