Frame Relay Configuration; Overview; Frame Relay Interface Types - H3C SR6600 Configuration Manual

8

Frame Relay Configuration

This chapter includes these sections:

Overview

Frame Relay Configuration Task List
Configuring DTE Side Frame Relay
Configuring DCE Side Frame Relay
Enabling the Trap Function
Displaying and Maintaining Frame Relay
Frame Relay Configuration Examples
Troubleshooting Frame Relay
Overview
Frame relay is essentially simplified X.25 WAN technology. It adopts statistical multiplexing technology
and thus can establish multiple virtual circuits over a single physical cable to make full use of network
bandwidth. Frame relay uses data link connection identifiers (DLCIs) to identify virtual circuits and
maintain the status of each virtual circuit with the Local Management Interface (LMI) protocol.
A frame relay network can be a public network, a private, enterprise network, or a network formed by
direct connections between two devices.
This section covers these topics:

Frame Relay Interface Types

Virtual Circuit
Data Link Connection Identifier
Frame Relay Address Mapping
LMI Protocol
Typical Application Scenarios
Frame Relay Interface Types
As shown in Figure
hosts. The user devices are also called data terminal equipment (DTE). They are connected to a frame
relay network through the DTE interface. The devices that provide access to the frame relay network for
DTEs are called data communications equipment (DCE). A DCE is connected to a DTE with a DCE
interface on the user network interface (UNI) side and to a frame relay switch in the frame relay network
with a network-to-network interface (NNI) on the NNI side. The switches in the frame relay cloud are
connected with the NNI.
In actual applications, a DTE interface can connect to only one DCE interface, and an NNI interface can
connect to only one NNI interface. On a frame relay switch, the frame relay interface should be an NNI
or DCE interface.
8-1, frame relay enables communication between user devices such as routers and
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