Avaya Configuring Frame Relay Services Manuel d'utilisateur Page 32

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Configuring Frame Relay Services
2-6 117376-B Rev. 00
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).
Figure 2-4. Structure of the DLCMI
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
876 54 32 187654321
3-byte format 4-byte format
FR0003A
DLCMI DLCMI
Router
Router
Frame
relay
Frame
relay
FR0004A
Network
node
switch
Network
node
switch
Network
node
switch
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