3.4 Creating a VLANIF Interface
VLANIF interfaces are Layer 3 logical interfaces. After creating VLANIF interfaces on Layer
2 devices, you can configure Layer 3 features on these interfaces.
3.4.1 Establishing the Configuration Task
Before creating a VLANIF interface, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the data required for the configuration. This
will help you complete the configuration task quickly and accurately.
Applicable Environment
Layer 3 switching combines routing and switching techniques to implement routing on a switch,
thus improving the overall network performance. After sending the first data flow, a Layer 3
switch generates mappings between MAC addresses and IP addresses. To send the same data
flow, the switch directly sends the data flow at Layer 2 but not Layer 3 based on this mapping
table. In this manner, delays on the network caused by route selection are eliminated, thus
improving data forwarding efficiency. Layer 3 switches have both switching and routing
functions.
To allow that new data flows are correctly forwarded based on the routing table, be sure that the
routing table's routing entries are correct. Therefore, VLANIF interfaces and routing protocols
must be configured on Layer 3 switches for reachable Layer 3 routes.
Pre-configuration Tasks
Before creating a VLANIF interface, complete the following task:
l Creating a VLAN
Data Preparation
To create a VLANIF interface, you need to the following data.
No.
Data
1 VLAN ID
2 IP address to be assigned to the VLANIF interface
3 (Optional) Delay after which the VLANIF interface goes Down
4 (Optional) MTU of the VLANIF interface
3.4.2 Creating a VLANIF Interface
Before configure Layer 3 features on a Layer 2 device, you must create a VLANIF interface on
the device.
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.
87
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