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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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Configuring MAC Address Flapping Prevention to Block User Attacks

Configuring MAC Address Flapping Prevention to Block User Attacks

When you deploy a Layer 2 network, you can configure MAC address flapping prevention to block attacks from unauthorized users. As shown in Figure 2-9, employees of an enterprise need to access the server connected to Port1 of the switch. If an unauthorized user sends packets using the server's MAC address as the source MAC address, the server's MAC address is learned on another interface of the switch. Then packets sent by employees to the server are sent to the unauthorized user. As a result, employees cannot access the server, and important data may be intercepted by the unauthorized user. To prevent unauthorized users from using the server's MAC address to attack the switch, set a higher MAC address learning priority for the interface connected to the server than the interfaces connected to unauthorized users. In this case, MAC address flapping will not occur when unauthorized users attack the switch.

Figure 2-9  Networking of MAC address flapping prevention
Updated: 2019-10-18

Document ID: EDOC1000178310

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