3.1 HDLC and IP-Trunk Interface Overview
The High-level Data Link Control (HDLC) is a typical bit-oriented synchronization data control
protocol. It adopts the full-duplex mode and CRC check. Its transmission control function is
independent of the processing function, and thus it features control capabilities and can be
flexibly used.
HDLC is featured by its transparent transmission of any kind of bit flow. The data is not required
to be a character set.
A trunk is aggregated by multiple ports among which load balancing is carried out. A trunk can
enhance the connection reliability.
Trunk interfaces are divided into Eth-Trunk interface and IP-Trunk interface.
The IP-Trunk consists of POS links only. The Eth-Trunk consists of Ethernet links only.
The IP-Trunk technology has the following advantages:
l Increasing bandwidth: Bandwidth of an IP-Trunk interface is the sum of all the bandwidth
of member ports.
l Enhancing reliability: If a member link failed, traffic is automatically switched to other
available links.
3.2 Features of HDLC and IP-Trunk interfaces on the switch
The protocols in the standard HDLC suite operate on synchronous serial lines. An IP-Trunk
consists of POS links only. The link layer protocol of the interfaces joining an IP-Trunk interface
must be HDLC.
The protocols in standard HDLC suite operate on the synchronous serial lines.
The IP-Trunk consists of POS links only. The link layer protocol of the member interface joining
the IP-Trunk interface must be HDLC.
An IP-Trunk interface has the following characteristics:
l Supports configured IP addresses. When forwarding packets, each member interface uses
the IP address of the IP-Trunk interface.
l Supports QoS based on physical ports rather than logical ports.
l Supports hot backup and hot swap.
3.3 Configuring HDLC
This section describes how to configure basic HDLC functions. Detailed operations include
configuring the data link protocol of an interface as HDLC, an IP address for an interface, and
the polling interval.
3.3.1 Establishing the Configuration Task
Before configuring basic HDLC functions, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the required data. This can help you complete
the configuration task quickly and accurately.
Quidway S9300 Terabit Routing Switch
Configuration Guide - WAN Access 3 HDLC and IP-Trunk Configuration
Issue 02 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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