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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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Intra-VLAN Layer 2 Isolation

Intra-VLAN Layer 2 Isolation

You can add different users to different VLANs to implement Layer 2 isolation between users. If an enterprise has many users, VLANs have to be allocated to all users who are not allowed to communicate with each other. This user isolation method uses a large number of VLANs and makes configuration more complex, increasing the maintenance workload of the network administrator.

Huawei provides intra-VLAN Layer 2 isolation technologies including port isolation, MUX VLAN, and Modular QoS Command-Line Interface (MQC).

Port Isolation

Port isolation can isolate interfaces in a VLAN. You can add interfaces to a port isolation group to disable Layer 2 packet transmission between the interfaces. Interfaces in different port isolation groups or out of port isolation groups can exchange packets with other interfaces. In addition, interfaces can be isolated unidirectionally, providing more secure and flexible networking.

For details about port isolation, see Configuring Port Isolation in "Ethernet Interface Configuration" in the S7700 and S9700 V200R011C10 Configuration Guide - Interface Management.


Multiplex VLAN (MUX VLAN) provides a mechanism to control network resources using VLANs. It can implement inter-VLAN communication and intra-VLAN isolation.

For example, an enterprise has the following requirements:
  • Employees can communicate with each other but customers are isolated.
  • Both employees and customers can access enterprise servers.

You can deploy the MUX VLAN to meet the preceding requirements.

For details about the MUX VLAN feature, see MUX VLAN Configuration.

Intra-VLAN Layer 2 Isolation Based on the Traffic Policy

A traffic policy is configured by binding traffic classifiers to traffic behaviors. You can define traffic classifiers on a switch to match packets with certain characteristics and associate the traffic classifiers with the permit or deny behavior in a traffic policy. The switch then permits or denies packets matching the traffic classifiers. In this way, intra-VLAN unidirectional or bidirectional isolation is implemented based on the traffic policy.

The switch supports intra-VLAN Layer 2 isolation based on MQC and ACL-based simplified traffic polices. For details about MQC and ACL-based simplified traffic polices, see MQC Configuration and ACL-based Simplified Traffic Policy Configuration in the S7700 and S9700 V200R011C10 Configuration Guide - QoS.

Updated: 2019-10-18

Document ID: EDOC1000178310

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