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S12700 V200R010C00 Configuration Guide - Ethernet Switching

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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Configuration Task Summary

Configuration Task Summary

Table 4-5 describes the VLAN configuration tasks. Figure 4-23 illustrates the logical relationship between configuration tasks.

Figure 4-23  Logical relationship between configuration tasks
Table 4-5  VLAN configuration task summary
Configuration Task Description

VLANs can isolate the hosts that do not need to communicate with each other, which improves network security, reduces broadcast traffic, and mitigates broadcast storms.

Configuring Inter-VLAN Communication

After VLANs are assigned, users in different VLANs cannot directly communicate with each other. If users in different VLANs need to communicate, configure VLANIF interfaces to implement inter-VLAN Layer 3 connectivity.


You can also configure a VLAN termination sub-interface or VLAN Switch to implement inter-VLAN connectivity. For details about the VLAN termination sub-interface and VLAN switching, see Using a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication and VLAN Switch Configuration.

Configuring a Traffic Policy to Implement Intra-VLAN Layer 2 Isolation

After VLANs are assigned, users in the same VLAN can directly communicate with each other. If some users in the same VLAN need to be isolated, configure MQC-based intra-VLAN Layer 2 isolation.


Intra-VLAN isolation can also be implemented using port isolation. For details about port isolation, see Configuring Port Isolation in "Ethernet Interface Configuration" in the S12700 V200R010C00 Configuration Guide - Interface Management.

Configuring a Traffic Policy to Implement Inter-VLAN Layer 3 Isolation

After VLANIF interfaces are configured to implement inter-VLAN connectivity, users in different VLANs can communicate at Layer 3. If some users in different VLANs require unidirectional communication or need to be isolated, configure a traffic policy.

Configuring an mVLAN

To use the NMS to manage devices in a centralized manner, assign VLANs and configure a VLAN as the management VLAN.

Configuring Transparent Transmission of Protocol Packets in a VLAN

An interface sends protocol packets of all VLANs to the CPU for processing, affecting the forwarding efficiency. You can configure protocol packet transparent transmission in a VLAN so that the switch sends only protocol packets in a specified VLAN. This function improves the forwarding efficiency.

Updated: 2019-08-21

Document ID: EDOC1000142081

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