HDLC and IP-Trunk introduction

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High-level Data Link Control (HDLC) is a bit-oriented link layer protocol.
A trunk interface aggregates many interfaces into an aggregation group to implement load balancing among member interfaces for received and sent packets. In addition, a trunk interface offers higher connectivity reliability. Currently, for Huawei datacom products, IP-Trunk member interfaces can be encapsulated only using HDLC.

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