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S12700 V200R012C00 Configuration Guide - Ethernet Switching

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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Configuring Preferential Forwarding of Local Traffic in a CSS

Configuring Preferential Forwarding of Local Traffic in a CSS

Context

On a network where interfaces of multiple switches in a CSS form an Eth-Trunk, configure the Eth-Trunk to preferentially forward local traffic to increase bandwidth use efficiency between CSS devices and improve traffic forwarding efficiency.

Determine whether to enable preferential forwarding of local traffic on an Eth-Trunk based on actual needs:

  • If active interfaces in the local Eth-Trunk have sufficient bandwidth to forward traffic on the local device, enable this function to improve traffic forwarding efficiency and increase 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, disable this function to prevent packet loss. Some traffic on the local device is forwarded through member interfaces on another device.

Pre-configuration Tasks

Before configuring preferential forwarding of local traffic in a stack, 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, broadcast, and multicast packets.

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Updated: 2019-01-18

Document ID: EDOC1100038103

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