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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

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, HVRP, and Layer 2 protocol transparent transmission.
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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 this configuration is complete, the following issue may occur: If a network device (such as a server) connected to an interface of the 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 on S series switches.

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 configured to prohibit MAC address flapping.

    By default, the action is forward when 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: 2019-01-18

Document ID: EDOC1100038843

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