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ZXR10 GER (V2.6.03) General Excellent Router User Manual Volume-I
142
Confidential and Proprietary Information of ZTE CORPORATION
Topic
Page No
FR Overview
FR (Frame Relay) protocol is a high-performance WAN protocol
running in the physical layer and data link layer of the OSI
reference model. FR is a packet switching technology and is a
simplified version of X.25. With the omission of some
complicated functions of X.25 (such as window technology and
data retransmission technology), FR relies on upper-level
protocols to support error correction, since the FR works on a
piece of WAN equipment that is better than the WAN equipment
where the X.25 works.
Equipment has higher reliability. The FR strictly corresponds to
the bottommost two layers of the OSI reference model, while
X.25 also provides L3 services. Therefore, the FR has higher
performance and more efficient transmission efficiency than
X.25.
The WAN equipment of FR is divided into Data Terminal
Equipment (DTE) and Data Circuit Equipment (DCE). Normally,
routers serve as DTE.
FR technology provides communications of connection-oriented
data link layer. A defined communication link is available
between each pair of equipment, and also the link has a Data
Link Connection Identity (DLCI). Such a service is implemented
via FR virtual circuits. Each FR virtual circuit identifies itself with
DLCI. Normally, DLCI is designated by the FR service provider.
FR supports PVC as well as SVC.
Local Management Interface (LMI) of the FR is an extension of
the basic FR standards. As the signaling standard between the
router and FR switch, the FR LMI provides the FR management
mechanism. The FR LMI provides many features to manage a
complicated internetwork, including such functions as global
addressing, virtual circuit status message and multi-destination
sending.
Configuring FR
This procedure describes how to do FR configuration on ZTE
ZXR10 GER.
Router Command Line Interface has been accessed.
1. To select an interface to be configured and to enter into
interface configuration mode, use the following command, as
shown in Table 172.
Frame Relay
Architecture
DLCI
LMI
Purpose
Prerequisite
Steps
Содержание ZXR10 GER
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