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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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Application Scenarios for MAC Address Tables

Application Scenarios for MAC Address Tables

MAC Address Anti-flapping

As shown in Figure 2-9, employees of an enterprise need to access the enterprise server. If an attacker uses the server MAC address as the source MAC address to send packets to another interface, the server MAC address is learned on the interface. Packets sent to the server are sent to unauthorized users. In this case, employees cannot access the server, and important data will be intercepted by the attacker. MAC address anti-flapping can be configured to prevent unauthorized users from using the server MAC address to access the switch.

Figure 2-9 Networking diagram of MAC address anti-flapping

MAC Address Flapping Detection

As shown in Figure 2-10, a loop occurs on a user network because network cables between two LSWs are incorrectly connected. The loop causes MAC address flapping and MAC address table flapping.

You can enable MAC address flapping detection on the Switch to detect MAC address flapping and discover loops.

Figure 2-10 Networking diagram of MAC address flapping detection

Updated: 2019-05-08

Document ID: EDOC1100004351

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