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Data Link Connection Identifier

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الكلية كلية تكنولوجيا المعلومات     القسم قسم شبكات المعلومات     المرحلة 4
أستاذ المادة وسام سمير عبد علي بهيه       29/01/2016 10:14:47
Data Link Connection Identifier DLCI

In Frame Relay, the end of each connection has a number to identify it called a Data Link Connection Identifier (DLCI).
Any station can connect with any other simply by stating the address of that station and DLCI number of the line it needs to use.

In a later section, you will learn that when Frame Relay is configured, all the data from all the configured DLCIs flows through the same port of the router.


VCs provide a bidirectional communication path from one device to another. VCs are identified by DLCIs. DLCI values typically are assigned by the Frame Relay service provider (for example, the telephone company). Frame Relay DLCIs have local significance, which means that the values themselves are not unique in the Frame Relay WAN. A DLCI identifies a VC to the equipment at an endpoint. A DLCI has no significance beyond the single link. Two devices connected by a VC may use a different DLCI value to refer to the same connection.


Locally significant DLCIs have become the primary method of addressing, because the same address can be used in several different locations while still referring to different connections. Local addressing prevents a customer from running out of DLCIs as the network grows.


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