Link Layer Discovery Protocol: Difference between revisions

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{{short description|Protocol used by network devices for advertising their identity}}

{{Redirect|LLDP|the lyingleft lateral decubitus position|DecubitusLying (position)}}

{{Internet protocol suite|link=LLDP}}

{{IPstack}}

The '''Link Layer Discovery Protocol''' ('''LLDP''') is a vendor-neutral [[link layer]] protocol used by [[network device]]s for advertising their identity, capabilities, and neighbors on a [[local area network]] based on [[IEEE 802]] technology, principally [[wired Ethernet]].<ref>{{cite web

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|publisher=IEEE

|access-date=2009-10-17

}}</ref> The protocol is formally referred to by the IEEE as ''Station and Media Access Control Connectivity Discovery'' specified in '''IEEE 802.1AB''' with additional support in IEEE 802.3 section 6 clause 79.<ref>{{cite web|url=https://standards.ieee.org/standardieee/802_1AB-2016802.html1AB/6047/|title=IEEE 802.1AB-2016 - IEEE Standard for Local and metropolitan area networks - Station and Media Access Control Connectivity Discovery}}</ref>

LLDP performs functions similar to several [[proprietary protocol]]s, such as [[Cisco Discovery Protocol]], [[Foundry Discovery Protocol]], [[Nortel Discovery Protocol]] and [[Link Layer Topology Discovery]].

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==Applications==

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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* Auto-discovery of LAN policies (such as VLAN, [[802.1q|Layer 2 Priority]] and [[Differentiated services]] (Diffserv) settings) enabling [[plug and play]] networking.

* Device ___location discovery to allow creation of ___location databases and, in the case of [[Voice over Internet Protocol]] (VoIP), [[Enhanced 911]] services.

* Extended and automated power management of [[Power over Ethernet]] (PoE) end pointsendpoints.

* Inventory management, allowing network administrators to track their network devices, and determine their characteristics (manufacturer, software and hardware versions, serial or asset number).

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| url=http://www.tiaonline.org/standards/technology/voip/documents/ANSI-TIA-1057_final_for_publication.pdf

| title=ANSI/TIA-1057 standard

| archive-url = https://web.archive.org/web/20101008234510/https://tiaonline.org/standards/technology/voip/documents/ANSI-TIA-1057_final_for_publication.pdf

| archive-date = 2010-10-08

}}</ref>

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|-

|

| align="left" | {{MACaddr|01:80:c2:00:00:0e}},&nbsp;or<br /> {{MACaddr|01:80:c2:00:00:03}},&nbsp;or<br /> {{MACaddr|01:80:c2:00:00:00}}

| Station's address

| 0x88CC

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|}

According to IEEE Std 802.1AB, §9.6.1.3, "The Organizationally Unique Identifier shall contain the organization's OUI as defined in IEEE Std 802-2001." Each organization is responsible for managing theirits subtypes.

==Notes==