Chapter 7 FRMConfiguring Frame Relay
Introduction
Frame relay ports in the Sm artSwitch 18 00 are us ed to carr y f rame relay traff ic, as w ell
as other protocols encapsulated in frame relay (per RFC 1490, via logical X.25 ports
over frame relay). A frame relay port can act as physical DCE, connectin g to end-user
devic e s, or DTE , connect ing to a n etwor k or frame r e lay PVC.
Frame relay support includes:
RFC 1490 for HDLC, LLC2, IP, IPX over frame relay
Line spe e ds up to 2. 048 Mbp s
Voice over frame relay
LMI, A nnex D lin k mana gement
Annex F segmentation and re-assembly
Bandwidth allocation
Connection prioritization
Incomi ng and out going r ate cont rol (CI R)
Virtual circuit backup for s ingle or multiple PVCs/DLCIs, including b andwidth
allocation on backup circuits

DLCI Sharing

Each logical connection on a physical frame relay port is assigned a Data Link Con-
nection Identifier (DLCI), which identifies a point-to-point connection, as shown in
the following example. (The numbers represent DLCIs.)
Multiple protocols can be passed over a single physical frame relay port by sharing a
DLCI. Each node supports up to 976 user-co nfigu rable D LCIs. (Seve ral more are sup-
ported, but are reserved for internal use.)
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