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Configuring Frame Relay Services

2-6

117376-C Rev. 00

Figure 2-2. Frame Relay Header: 2-Byte Format

Figure 2-2 shows the frame relay header as a 2-byte structure. Frame relay can

also format the header using 3 or 4 bytes, as shown in Figure 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

DLCI (high order) C/R

DLCI (low order)

8 7 6 5 4321

Flag

Frame

relay

header

Information

(data)

CRC

Flag

FR0002A

DLCI (high order)

DLCI

D/C EA

DLCI (low order)

DL-CORE control

C/R EA

DE EA

DLCI (high order) C/R

DLCI

(low order)

DLCI EA

D/C EA

DLCI (low order)

DL-CORE control

876 54 32 187654321

3-byte format 4-byte format

FR0003A

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 239 240

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Avaya Configuring Frame Relay Services Manual do Utilizador Página 36