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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Overview of Link Aggregation

Overview of Link Aggregation

Definition

Ethernet link aggregation, also called Eth-Trunk, bundles multiple physical links into a logical link to increase link bandwidth. The bundled links back up each other, increasing reliability.

Purpose

As networks grow in scale, users require Ethernet backbone networks to provide higher bandwidth and reliability. In the past, to increase the bandwidth, users had to replace legacy devices with high-speed devices. This solution, however, is costly and inflexible.

Link aggregation helps increase bandwidth by bundling a group of physical interfaces into a single logical interface, without having 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 the bandwidth of member interfaces.

  • Higher reliability

    When an active link fails, traffic on this active link moves 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 link members.

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Updated: 2018-12-24

Document ID: EDOC1100038339

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