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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to Link Aggregation

Introduction to Link Aggregation

This section describes definition and purpose of link aggregation.


Link aggregation is a technique to bundle multiple physical links to a logical link to increase link bandwidth.

Link aggregation refers to Eth-Trunk in this document. An Eth-Trunk consists of Ethernet links.


As the network scale expands increasingly, users propose increasingly higher requirements on Ethernet backbone network bandwidth and reliability. Traditional technologies often use devices supporting high-speed interfaces to increase the bandwidth.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 bandwidth of member interfaces.

  • Higher reliability

    When the physical link of a member interface fails, the traffic on the member link is switched to another member link, ensuring uninterrupted service on the trunk link.

  • Load balancing

    In an LAG, traffic is load balanced among active member interfaces.

Updated: 2019-08-09

Document ID: EDOC1000041694

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