Avaya Configuring Frame Relay Services Manual de usuario Pagina 24

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Configuring Frame Relay Services
2-4 117376-A Rev. A
Figure 2-2 depicts the frame relay header as a 2-byte structure. Frame relay can
also format the header using 3 or 4 bytes, as shown in F
igure 2-3. Note, however,
that you must configure the frame relay interface on the router to use the same
header length as the switched network to which it is connected.
Figure 2-3. Frame Relay Header, 3- and 4-Byte Formats
Management Protocols
Frame relay is an access protocol that runs between a router or data terminal
equipment (DTE) and a switch or data communications equipment (DCE). The
router and the switch use the Data Link Control Management Interface (DLCMI)
to exchange information about the interface and the status of each PVC
(F
igure 2-4).
DLCI (high order)
DLCI
F
E
C
N
B
E
C
N
D/C EA
DLCI (low order)
or
DL-CORE control
C/R EA
DE EA
DLCI (high order) C/R
DLCI
(low order)
F
E
C
N
DLCI EA
D/C EA
DLCI (low order)
or
DL-CORE control
DE
EA
B
E
C
N
EA
8 7 6 5 4 3 2 18 7 6 5 4 3 2 1
3-byte format 4-byte format
FR0003A
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