Compatible Systems 5.4 - Manual (Page 171)

Chapter 10 - WAN Link Protocols 165
The Data Link Connection Identifier (DLCI) is a number which uniquely
identifies one end of a Permanent Virtual Circuit (PVC) to your Frame Relay
carrier’s Frame Relay switch. The DLCIs are not interchangeable between the
two ends of a PVC, since they only identify one end of the PVC. Unless you
use the correct DLCI numbers at each end of your PVC, two-way communi-
cations cannot take place.
This database lets you create static mappings between the Frame Relay PVCs
on this interface (identified by their DLCI number) and the protocol (e.g. IP,
IPX, etc.) addresses of the router interfaces at the far ends of the PVCs.
v Note: If the router at the far end of a PVC is another Compatible Systems
router, you will generally not need any entries in the DLCI database for it.
Compatible Systems routers use the IARP (Inverse Address Resolution
Protocol) to dynamically create the same type of mappings that are manually
entered in the DLCI database.
v Note: A router will not use IARP to attempt to discover addresses for a
particular protocol on a PVC if there is already a DLCI database entry for
the PVC for that protocol. Therefore, if you wish to use IARP to dynamically
discover the addresses at the far end of a PVC, do not make any entries for
its DLCI number in the DLCI database.
v Note: Frame Relay DLCIs must be statically mapped using the DLCI
mapping database when IP subinterfaces are in use, because IARP can only
resolve a physical port, not a logical subinterface on that port.
> DLCI #
This is the decimal number between 16 and 991 which uniquely identifies this
end of a PVC. A DLCI number will be provided to you by your Frame Relay
carrier for each end of each PVC.
IP Address
This is the IP address of the router interface at the other end of the PVC. It
should be entered in standard IP dotted-decimal notation (e.g. 198.041.9.1).
AppleTalk Address
This is the AppleTalk address of the interface of the router WAN interface at
the other end of the PVC. It should be entered in decimal as a “network:node”
pair (e.g. 24:1).
The AppleTalk network number must be between 1 and 65,279. The node
address must be between 1 and 254.