A DLCI is used to identify a virtual circuit in the carrier's network. What is the range of num bers used for DLCIs, and which ones are reserved? Also, briefly describe how DLCIs are used in Frame Relay networks
What will be an ideal response?
The range of DLCIs used is 0 to 1023 . 0 to 16 and 991 to 1023 are reserved. LMI extensions
reserve DLCI 0 for ANSI and ITU and 1023 for Cisco. DLCIs are assigned to each virtual cir
cuit and are configured on the corresponding DTE device. When a router sends a frame to a
FRAD, the router checks the packet's destination IP address and determines which DLCI to use
from its Frame Relay map. It then uses that DLCI when sending the frame to the FRAd. The
FRAD switches the frame to the appropriate destination (or next hop in the Frame Relay cloud)
based on the DLCI supplied by the router.
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