Avaya Configuring Frame Relay Services User Manual download pdf (Page 22)

Configuring Frame Relay Services

1-4

Management Protocols

Frame Relay is an access protocol that runs between a router (DTE) and a switch

(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

(Figure 1-4).

Figure 1-4. Conceptual Drawing of the DLCMI

The DLCMI supports three standard data link management speciﬁcations: LMI,

ANSI T1.617 Annex D, and CCITT (now ITU-T) Q.933 Annex A.

• The networking industry ﬁrst developed the Local Management Interface

(LMI) speciﬁcation. The LMI approach is asymmetric; the router sends a

status-enquiry message to the network, signaling that the router’s connection

to the network is functioning. The network replies with a status response.

• ANSI modiﬁed the LMI speciﬁcation and incorporated it as Annex D to ANSI

standard T1.617. The ANSI method is generally similar to the LMI approach.

• The CCITT (now ITU-T) modiﬁed the ANSI standard and adopted it as

Annex A to Q.933. The CCITT Annex A speciﬁcation is similar to Annex D,

but it uses an international numbering scheme.

Be sure to conﬁgure the Frame Relay interface on the router to use the same

management protocol as the switched network to which it is connected.

See Chapter 4 for information about conﬁguring Frame Relay.

Network

Node

Switch

Network

Node

Switch

DLCMI

Router

Frame

Relay

Frame

Relay

Network

Node

Switch

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Avaya Configuring Frame Relay Services User Manual Page 22