Figure 9: Frame Relay Interface Design; Figure 10: Structure Of Frame Relay Protocols - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SYSTEM BASICS CONFIGURATION GUIDE 2010-10-04 Configuration Manual
Software for e series broadband services routers system basics configuration guide
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Copyright © 2010, Juniper Networks, Inc.
Receive traffic from subscribers that have CPE equipment, such as routers with Frame
Relay interfaces
Take in traffic from other network devices that use Frame Relay, such as DSLAMs and
Frame Relay switches
Use Frame Relay as an uplink technology on an unchannelized T3 or E3 link
Figure 9 on page 17 shows the structure of the Frame Relay interface. Each Frame Relay
major interface sits on top of an HDLC interface. The Frame Relay implementation is
divided into two levels: a major interface and one or more subinterfaces. This division
allows a single physical interface to support multiple logical interfaces. Multiple IP
interfaces can also be assigned to each Frame Relay major interface through the
subinterfaces.
Figure 9: Frame Relay Interface Design
Figure 10 on page 17 shows the structure of the Frame Relay protocols with the physical
layer as the foundation. For Frame Relay, the physical layer can be channelized E1, E3,
channelized T1, T3, or a fractional service, as supported by the different line module ports.
The HDLC layer is on top of the physical layer and can support flexible assignment of
physical resources.
For example, an HDLC channel can support one DS0, a fractional T1, or an entire T1. The
major Frame Relay interface sits on top of the HDLC resource, and the subinterfaces sit
on top of the major interface. The Frame Relay subinterfaces connect to the IP interface
layer.
Figure 10: Structure of Frame Relay Protocols
The router supports Frame Relay LMI (local management interface) to provide the
operator with configuration and status information relating to the Frame Relay VCs in
operation. LMI specifies a polling mechanism to receive incremental and full-status
updates from the network. The router can represent either side of the User-to-Network
Interface (UNI) and supports unidirectional LMI. Bidirectional support for the
Network-to-Network Interface (NNI) is also supported.
Chapter 1: Planning Your Network
17
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