Local Management Interface: Difference between revisions

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{{RefimproveMore citations needed|date=September 2008}}

'''Local Management Interface (LMI)''' is a term for some signaling standards used in networks, namely [[Frame Relay]] and [[Carrier Ethernet]].

'''Local Management Interface (LMI)''' is a signaling standard used between [[router]]s and [[frame relay]] switches. Communication takes place between a router and the first frame relay switch it's connected to. Information about [[keepalive]]s, global addressing, [[IP Multicast]] and the status of [[virtual circuits]] is commonly exchanged using LMI.

== Frame Relay ==

There are three standards for LMI: ANSI's T1.617 Annex D standard; ITU-T's Q.933 Annex A standard; and the "Gang of Four" standard, named for the four companies that developed it: Cisco, DEC, StrataCom and NorTel (Northern Telecom).

'''Local Management Interface (LMI)''' is a signalingset standardof usedsignalling standards between [[Router (computing)|router]]s and [[frameFrame relay]]Relay switches. Communication takes place between a router and the first frameFrame relayRelay switch to which it's connectedis toconnected. Information about [[keepalive]]s, global addressing, [[IP Multicastmulticast]] and the status of [[virtual circuits]] is commonly exchanged using LMI.

There are three standards for LMI:

The "Gang of Four" LMI standard uses DLCI 1023<ref name="Odom">{{cite book |title=CCNA ICND2 |last=Odom |first=Wendell |authorlink= |coauthors= |year=2008 |publisher=Cisco Press |___location=[[Indianapolis, Indiana|Indianapolis]] |isbn=1-58720-181-X |url= |page=467 }}</ref>. The T1.617 Annex D and Q.933 Annex A standards use DLCI 0<ref name ="Odom" />.

* Using [[Data link connection identifier|DLCI]] 0:<ref name ="Odom" />

** ANSI's T1.617 Annex D standard

** ITU-T's Q.933 Annex A standard

* Using DLCI 1023:

** The "Gang of Four" standard, developed by [[Cisco]], [[Digital Equipment Corporation|DEC]], [[StrataCom]] and [[Nortel]]<ref name="Odom">{{cite book |title=CCNA ICND2 |last=Odom |first=Wendell |year=2008 |publisher=Cisco Press |___location=[[Indianapolis, Indiana|Indianapolis]] |isbn=978-1-58720-181-3 |url=https://archive.org/details/isbn_9781587201813/page/467 |page=[https://archive.org/details/isbn_9781587201813/page/467 467] |url-access=registration }}</ref>

== Carrier Ethernet ==

Ethernet Local Management Interface (E-LMI) is an Ethernet layer operation, administration, and management (OAM) protocol defined by the [[Metro Ethernet Forum]] (MEF) for Carrier Ethernet networks. It provides information that enables auto configuration of customer edge (CE) devices.

== References ==

<references />

==External links==

*[https://web.archive.org/web/20160401071013/http://communitystring.com/2009/10/frame-relay-lmi/ Additional information on Frame Relay LMI]

[[Category:Computer networking]]

[[Category:Frame Relay]]

{{compu-network-stub}}