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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Introduction to Link Aggregation

Introduction to Link Aggregation


Ethernet link aggregation, also called Eth-Trunk, bundles multiple physical links to form a logical link to increase link bandwidth. The bundled links implement redundancy, increasing reliability.


As the network scale expands, users have increasingly high requirements on the bandwidth and reliability of the Ethernet backbone network. Originally, to increase the bandwidth, users used high-speed cards or devices with high-speed interface cards to replace old interface cards or devices. This solution, however, is costly and inflexible.

Link aggregation increases bandwidth by bundling a group of physical interfaces into a single logical interface, without the need to upgrade hardware. In addition, link aggregation provides link backup mechanisms, greatly improving link reliability.

Link aggregation has the following advantages:

  • Increased bandwidth

    The bandwidth of the link aggregation interface is the sum of bandwidth of member interfaces.

  • Higher reliability

    When an active link fails, traffic on this active link is switched to another active link, improving reliability of the link aggregation interface.

  • Load balancing

    In a link aggregation group (LAG), traffic is load balanced among active links of member interfaces.

Updated: 2019-08-21

Document ID: EDOC1000142081

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