Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 75)

Customizing Frame Relay Interfaces

308624-14.10 Rev 01

3-5

Selecting Address Type and Length

You can specify the data link connection identifier (DLCI) address type and length

that the router and the frame relay network use to direct packets to their

destinations. The address type for the router and for the switch must be the same.

Selecting a DLCI Address Type

The options for the DLCI address type are:

• ADDR Q922 selects addressing as specified in the final version of the Q.922

standard. Q.922 provides for FECN, BECN, DE, and EA bits. While most

Q.922 addresses are included within a 2-octet field, the standard allows for

3- and 4-octet address fields. This is the default.

•The November draft of ADDR Q922 differs from ADDR Q922 in dropping

the D/C bit from the extended (3- and 4-byte) forms. The D/C bit (DLCI or

DL-Core Control Indication) is always 0.

•The March draft of ADDR Q922 differs from ADDR Q922 in defining an

11-bit DLCI and dropping the DE bit from the second octet of the address

field.

• ADDR Q921 differs from ADDR Q922 MARCH 90 in that it does not use

FECNs or BECNs, which means that it does not provide congestion control.

Selecting a DLCI Address Length

The options for the DLCI address length are 2, 3, or 4 bytes. To understand the

distinctions among these byte formats, see the illustrations of frame relay headers

in Figure 1-2 and Figure 1-3 on page 1-6.

You can use either the BCC or Site Manager to configure the DLCI address type

and length.

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 75