3.12.5 Example for Implementing Communication Between VLANs
by Using VLANIF Interfaces
A Layer 3 switch can replace a router to implement communications between VLANs by using
VLANIF interfaces.
Networking Requirements
Departments of an enterprise are located on different network segments and use same services
such as Internet access and VoIP. Departments in different VLANs need to use the same service,
so communication between VLANs must be implemented.
As shown in Figure 3-14, department 1 and department 2 use the same service but belong to
different VLANs and are located on different network segments. Users in department 1 and
department 2 need to communicate with each other.
Figure 3-14 Communication between VLANs using VLANIF interfaces
SwitchA
Switch
GE1/0/1
VLAN 10
VLAN 20
PC1
10.10.10.2/24 20.20.20.2/24
Department1
PC2
Department2
GE1/0/1
GE1/0/2 GE1/0/3
Configuration Roadmap
The configuration roadmap is as follows:
1. Create VLANs on the switches for different departments.
2. Add Layer 2 interfaces to the VLANs so that packets of the VLANs can pass through the
Layer 2 interfaces.
3. On the Layer 3 switch, create VLANIF interfaces corresponding to the VLANs and
configure IP addresses for the VLANIF interfaces to implement Layer 3 communication.
NOTE
To implement communication between VLANs, hosts in each VLAN must use the IP address of the
corresponding VLANIF interface as gateway address.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 3 VLAN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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