Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

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Chapter 2
Configuring Frame Relay
This chapter describes how to configure a Frame Relay interface on E Series routers.
This chapter contains the following sections:
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Overview on page 107
■
Platform Considerations on page 109
■
References on page 110
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Before You Configure Frame Relay on page 110
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Configuring Frame Relay on page 111
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End-to-End Fragmentation and Reassembly on page 119
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Monitoring Frame Relay on page 123
Overview
Frame Relay is a public, connection-oriented packet service based on the core aspects
of the Integrated Services Digital Network (ISDN). Frame Relay eliminates all
processing at the network layer and greatly restricts data-link layer processing. Such
simplified processing is possible because of the availability of virtually error-free
physical connections and the presence of intelligent protocols at the end-user site,
which can detect and retransmit faulty or discarded packets.
Frame Relay shifts responsibility for error recovery and flow control to the end user,
thereby reducing protocol complexity and allowing high-speed packet delivery with
low transit delay.
For a list of the modules on which you can configure Frame Relay, see ERX Module
Guide, Appendix A, Module Protocol Support .
Framing
E Series routers support the following framing features:
■
HDLC for data-link framing
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2-byte addresses only
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8188-byte information field size (8192 minus 2 bytes for the address and a 16-bit
CRC) or 8186-byte information field size (8192 minus 2 bytes for the address
and a 32-bit CRC)
Overview
■ 107