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Data Link Connection Identifier

الكلية كلية تكنولوجيا المعلومات     القسم قسم شبكات المعلومات     المرحلة 4
أستاذ المادة وسام سمير عبد علي بهيه       12/12/2012 22:01:08
Data Link Connection Identifier (DLCI)


DLCI,
Identifying VCs,
Multiple VCs,
FR Addressing Mapping,
Inverse ARP,
Dynamic Mapping,
Static Mapping,
Local Management Interface (LMI),
Using LMI and Inverse ARP to Map Addresses,
Configuring Basic Frame Relay.


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.

Identifying VCs
When the frame moves across the network, Frame Relay labels each VC with a DLCI. The DLCI is stored in the address field of every frame transmitted to tell the network how the frame should be routed. The Frame Relay service provider assigns DLCI numbers.
Usually, DLCIs 0 to 15 and 1008 to 1023 are reserved for special purposes. Therefore, service providers typically assign DLCIs in the range of 16 to 1007.

In this example, the frame uses DLCI 102. It leaves the router (R1) using Port 0 and VC 102. At switch A, the frame exits Port 1 using VC 432. This process of VC-port mapping continues through the WAN until the frame reaches its destination at DLCI 201, as shown in the figure. The DLCI is stored in the address field of every frame transmitted.


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