Data link connection identifier
A data link connection identifier (DLCI) is a Frame Relay 10 bit wide link-local virtual circuit identifier used to assign frames to a specific PVC or SVC. Frame Relay networks use DLCIs to statistically multiplex frames. DLCIs are preloaded into each switch and act as road signs to the traveling frames.[1]
The standard allows the existence of 1024 DLCIs, however only numbers from 16 to 991 are available for end users' equipment. The rest are reserved for various management purposes.[2]
References
- ^ "DLCI's". Retrieved 22 March 2011.
- ^ "What is Frame Relay". Retrieved 2007-09-18.
FRAME RELAY IS A SPECIAL TYPE OF L2 SWITCHING TECHNOLOGY FOR CREATING MULTI ACCESS WAN LINK BETWEEN INTERNET ROUTER.
AS IT IS MULTI ACCESS LINK SO,EVERY ROUTER NEEDS A LAYER 2 ADDRESS TO CONNECT TO DIFFERENT ROUTERS IN THE NETWORK. THIS L2 ADDRESS IS CALLED DLCI{DATA LINK CONNECTION IDENTIFIER} WHEN A SERVICE PROVIDER PROVIDES FRAME RELAY CONNECTION TO ANY ROUTER IT ALLOCATES ONE OR MORE DLCI TO THAT ROUTER. SO DLCI IS LOCALY SIGNIFICANT TO ANY ROUTER.THERE ARE 1024 TYPES OF DLCIs BUT ALL ARE NOT IN USE.SOME OF THEN ARE RESERVED FOR SOME SPECIAL PURPOSE. NOW LETS KNOW ABOUT THE LMI[LINK MANAGEMENT INTERFACE} THIS ARE NOTHING BUT ONLY SOME SPECIAL TYPES OF MESSAGES. AFTER THE FRAME RELAY CONNECTION IS ESABILISHED THE FRAME RELAY ROUTER AND INTERNET SERVICE PROVIDER FRAME RELAY SWITCH PERIODICALLY EXCHANGES SPECIAL TYPE OF MESSAGE KNOWN AS LMI(LINK MANAGENENT INTERFACE) TO CONSTANTLY MONITOR THE LINK BETWEEN THEM. THIS MESSAGE CAN BE OF 3 TYPES 1. CISCO PROPIOTARY , 2. qq33a , 3.ANSI
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