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Configuration Guide - Virtualization

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of virtualization, including stack and SVF.
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Configuring the Enhanced Stack DAD Function

Configuring the Enhanced Stack DAD Function


The enhanced stack dual-active detection (DAD) function enhances the DAD mechanism and improves the convergence performance in case of a stack fault or recovery. Enhanced stack DAD has the following enhancements:
  • If a stack splits, the interval for sending DAD packets is shortened.
  • Comparing the physical status of uplink ports on stack members is added to the DAD competition rules. The stack master is elected according to the following rules in the listed order (the election ends when a winning switch is found):
    1. Physical status of uplink ports: The switch on which uplink ports are not all Down wins. For example, if the uplink ports of SwitchA are not all Down but the uplink ports of SwitchB are all Down, SwitchA wins the competition and becomes the stack master.

    2. Stack priority: The switch with a higher stack priority wins.

    3. MAC address: The switch with a smaller MAC address wins.

  • CE5800 and CE6880EI do not support the enhanced stack DAD function.

  • Only the stack that contains two switches supports the enhanced stack DAD function.

  • The enhanced stack DAD function and the SVF function are mutually exclusive and cannot be both configured.

  • The enhanced stack DAD function is not supported when DAD is implemented through management ports.

  • To configure the enhanced stack DAD function when DAD in direct mode is implemented through service ports, you need to configure the port on which DAD is configured as a reserved port.

  • If you configure the enhanced DAD function when DAD in relay mode is implemented through Eth-Trunk interfaces, after the stack splits, the Eth-Trunk member interface used for DAD detection on the switch that fails the competition will enter the Error-Down state and then go Up. After going Up, these member interfaces cannot forward common service traffic and are used only to send DAD packets.


  1. Run system-view

    The system view is displayed.

  2. Run stack

    The stack management view is displayed.

  3. Run stack dual-active detect enhanced

    The enhanced stack DAD function is enabled.

    By default, the enhanced stack DAD function is disabled.

  4. Run quit

    Exit from the stack management view.

  5. Configure an uplink port.
    1. Run interface interface-type interface-number

      The interface view is displayed.

    2. Run uplink-port enable

      The interface is configured as an uplink port.

      By default, an interface is not configured as an uplink port.

      • A stack supports the configuration of up to 16 uplink ports.
      • It is not allowed to configure stack member ports and M-LAG peer-link interfaces as uplink ports.
      • It is not allowed to configure Eth-Trunk member ports and aggregated ports as uplink ports.
      • If no uplink ports are configured on a stack member, uplink ports on this member are considered Up.
      • Uplink ports need to transmit uplink traffic. Do not configure the ports that do not transmit uplink port as uplink ports.

    3. Run quit

      Exit from the interface view.

  6. Run commit

    The configuration is committed.

Updated: 2019-04-03

Document ID: EDOC1100075367

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