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S12700 V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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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

As shown in Figure 4-19, departments 1 and 2 of a small-sized 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 through 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

As shown in Figure 4-20, departments 1 and 2 of a medium- or large-sized 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 through the Layer 3 switches.

Figure 4-20  Using VLANIF interfaces to implement inter-VLAN connectivity 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: 2019-01-18

Document ID: EDOC1100038103

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