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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, 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 Stack

Configuring Preferential Forwarding of Local Traffic in a Stack

Context

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

Determine whether to enable preferentially 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 stack 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.
NOTE:

For the CE8860EI, when the system resource large-arp command is used to set the system resource mode to large ARP, preferentially forwarding of local traffic does not apply to Layer 3 traffic whose outbound interface in the ARP entry is an Eth-Trunk member interface.

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 stack.

  • Ensure that member interfaces in 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 undo local-preference disable

    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.

  4. Run commit

    The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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