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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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Using VLANIF Interfaces to Implement Inter-VLAN Layer 3 Connectivity

Using VLANIF Interfaces to Implement Inter-VLAN Layer 3 Connectivity

VLANIF interfaces are used to implement inter-VLAN Layer 3 connectivity when devices are connected to the same Layer 3 switch or different Layer 3 switches.

Inter-VLAN Layer 3 Connectivity Between Devices Connected to the Same Layer 3 Switch

In Figure 4-19, departments 1 and 2 of a small-scale company belong to VLAN 2 and VLAN 3, respectively, and connect to a Layer 3 switch (Switch) through Layer 2 switches. Packets exchanged between the two departments need to pass the Layer 3 switch.

Figure 4-19  Using VLANIF interfaces to implement inter-VLAN communication through the same Layer 3 switch

Assign VLANs on Switch_1 and Switch_2, configure Switch_1 and Switch_2 to transparently transmit VLAN packets to the Layer 3 switch, and configure a VLANIF interface for each VLAN on the Layer 3 switch to allow communication between VLAN 2 and VLAN 3.

Inter-VLAN Layer 3 Connectivity Between Devices Connected to Different Layer 3 Switches

In Figure 4-20, departments 1 and 2 of a medium- or large-scale company are connected across two or more Layer 3 switches, and belong to VLAN 2 and VLAN 3 respectively. Packets exchanged between the two departments need to pass the Layer 3 switches.

Figure 4-20  Using VLANIF interfaces to implement inter-VLAN communication through multiple Layer 3 switches

Assign VLANs on the Layer 2 switches, and configure the Layer 2 switches to transparently transmit VLAN packets to Layer 3 switches. Configure a VLANIF interface for each user VLAN and interconnected VLANs on Switch_1 and Switch_2, and configure VLANIF interfaces for interconnected VLANs on other Layer 3 devices. In addition, configure static routes or a dynamic routing protocol between Switch_1 and Switch_2 (a dynamic routing protocol is recommended when devices are connected across more than two Layer 3 switches).

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Updated: 2019-08-21

Document ID: EDOC1000142081

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