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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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

Context

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

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

The S7703, and S9703 do not support this configuration.

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 the Eth-Trunk that needs to be configured to preferentially forward local traffic 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 is invalid for unknown unicast packets, broadcast packets, and multicast packets.

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Updated: 2019-10-18

Document ID: EDOC1000178310

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