The data link connection identifier (DLCI) is a number used to identify a PVC endpoint in the frame relay network. The DLCI is attached to data frames passed through the network, allowing the frames to be sent to their proper destinations.
The DLCI has local significance only, meaning that each PVC on a particular physical port must have a different DLCI number. However, a DLCI need not be unique throughout the Passport 4400, or throughout the network. For instance, it is possible to have two PVCs, one on Port 1 of the base module and the other on Port 2, terminating at different endpoints, but with the same DLCI. See the illustration below for an example of Multiple PVCs and Endpoint DLCIsProcedure for Configuring Physical Ports and DLCIs
For netlinks established over a leased line (for example, an ISDN connection), it is important that you use the same DLCI for each end of the connection. For netlinks established over a frame relay network, contact your network service provider to obtain the DLCI for each node. See the illustration below for an example of Endpoint DLCIs on a leased line.
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Procedure for Configuring Physical Ports and DLCIs
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