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CHAPTER 16
Configuring Cisco HDLC
Overview
Framing
Copyright © 2010, Juniper Networks, Inc.
Cisco High-Level Data Link Control (HDLC) is an encapsulation protocol that governs
information transfer. This chapter describes how to configure Cisco HDLC on E Series
routers.
This chapter contains the following sections:
Overview on page 503
Platform Considerations on page 504
Before You Configure Cisco HDLC on page 505
Configuration Tasks on page 505
Monitoring Cisco HDLC on page 508
Cisco HDLC is a bit-oriented synchronous data-link layer protocol developed by the
International Organization for Standardization (ISO). It specifies a data encapsulation
method on synchronous serial links using frame characters and checksums.
By default, synchronous serial lines use the HDLC serial encapsulation method, which
provides the synchronous framing-detection and error-detection functions of HDLC
without windowing or retransmission.
Cisco HDLC monitors line status on a serial interface by exchanging keepalive request
messages with peer network devices. It also enables routers to discover IP addresses of
neighbors by exchanging Serial Line Address Resolution Protocol (SLARP)
address-request and address-response messages with peer network devices.
The router responds to a SLARP address-request message from a remote peer with a
SLARP address-response message, which indicates that it cannot participate in a SLARP
session.
Cisco HDLC is compatible with Cisco Systems Cisco-HDLC protocol, the default protocol
for all Cisco serial interfaces.
The router supports the following framing features:
503
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