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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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Configuring Preferential Forwarding of Local Traffic in a CSS

Configuring Preferential Forwarding of Local Traffic in a CSS

On a network where a CSS and an Eth-Trunk are used, configuring the Eth-Trunk to preferentially forward local traffic increases bandwidth use efficiency between devices in the CSS and improves traffic forwarding efficiency.

Context

You can configure an Eth-Trunk to preferentially forward local traffic (or not) according to the following guidelines:

  • If active interfaces in the local Eth-Trunk have sufficient bandwidth to forward traffic on the local device, configure the Eth-Trunk to preferentially forward local traffic. This improves traffic forwarding efficiency and increases bandwidth use efficiency between devices in the CSS.
  • If active interfaces in the local Eth-Trunk do not have sufficient bandwidth to forward traffic on the local device, do not configure the Eth-Trunk to preferentially forward local traffic. A portion of the traffic on the local device is then forwarded through member interfaces of an Eth-Trunk on another device, preventing packet loss.

Pre-configuration Tasks

Before configuring an Eth-Trunk to preferentially forward local traffic, complete the following tasks:

  • Create an Eth-Trunk and add physical interfaces to the Eth-Trunk.

  • Establish a CSS.

  • Ensure that member interfaces of the local Eth-Trunk have sufficient bandwidth to forward local traffic.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface eth-trunk trunk-id

    The view of an Eth-Trunk is displayed.

  3. Run:

    local-preference enable

    The Eth-Trunk is configured to preferentially forward local traffic.

    By default, an Eth-Trunk forwards traffic preferentially through local member interfaces.

    NOTE:
    This function is only valid for known unicast packets, and does not work with unknown unicast packets, broadcast packets, and multicast packets.

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Updated: 2019-08-21

Document ID: EDOC1000142081

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