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ashvanth kumar
Beginner

FRAME RELAY - DLCI's

- in frame relay interface dlci command do we spcify the remote end pvc's DLCI or the local interface DLCI. Does this have anything to do this local and global DLCI addressing. I learnt that when a frame travels across the frame relay cloud the DLCI field of the frame header(there is nly 1 field for DLCI) would keep changing. If thats the case how the global dlci concept works? when a frame comes into a physical interface how does it indentify whether it was destined to it.

2 REPLIES 2
paolo bevilacqua
Hall of Fame Master

You specify the local DLCI. There is no such thing as "global dlci".

As the original poster observes and as Paulo re-enforces there really is no such thing as Global DLCI. Some vendors used that term and promoted a concept of Global DLCI with their customers. For example there might be a Frame Relay network that connected offices in New York, Atlanta, Chicago, and Seattle. The vendor would assign DLCIs so that all offices uesd 101 as the DLCI for New York, all offices used 103 as the DLCI for Atlanta, all offices used 105 as the DLCI for Chicago, and all offices used 107 as the DLCI for Seattle. This made it easier for the customer to configure and easier to manage the network.

In this sense 101 appears to globally represent New York. But in fact the DLCI is not global. 101 was the local DLCI at each site and it was administratively controlled to appear as if it were global.

HTH

Rick

HTH

Rick