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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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Preventing MAC Address Flapping Between Interfaces with the Same Priority

Preventing MAC Address Flapping Between Interfaces with the Same Priority

Context

Preventing MAC address flapping between interfaces with the same priority can improve network security.

After the switch is configured to prevent MAC address flapping between interfaces with the same priority, the following problem may occur: If the network device (such as a server) connected to an interface of switch is powered off and the same MAC address is learned on another interface, the switch cannot learn the correct MAC address on the original interface after the network device is powered on.

NOTE:

This configuration does not take effect on the SA cards of S series.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run undo mac-learning priority priority-id allow-flapping

    The device is configured to prevent MAC address flapping between interfaces with the same priority.

    By default, the device allows MAC address flapping between interfaces with the same priority.

  3. Run mac-learning priority flapping-defend action discard

    The switch discards packets when it is configured to prohibit MAC address flapping.

    By default, the action is forward when the switch is configured to prohibit MAC address flapping.

Verifying the Configuration

Run the display current-configuration command to check whether MAC address flapping is allowed between interfaces with the same priority.

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Updated: 2019-10-18

Document ID: EDOC1000178310

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