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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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Using a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication

Using a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication

As shown in Figure 5-2, the router connects to the switch through a Layer 3 Ethernet interface. User hosts are assigned to VLAN 2 and VLAN 3, and need to communicate with each other.

Figure 5-2  Using a Dot1q termination sub-interface to implement inter-VLAN communication

Perform the following operations to implement inter-VLAN communication:

  • Create sub-interfaces Port1.1 and Port1.2 on the Ethernet interface connecting Router to Switch.

  • Configure Dot1q termination on Port1.1 and Port1.2 to remove VLAN tags in packets sent by Switch.

  • Assign IP addresses to Port1.1 and Port1.2.

  • Configure the IP addresses of Port1.1 and Port1.2 as the default gateway addresses for user hosts.

After the preceding operations are performed, user hosts in VLAN 2 and VLAN 3 can communicate at Layer 3. When a host in VLAN 2 sends packets to a host in VLAN 3, the process is as follows:
  1. Port1.1 removes the VLAN tag of the packets sent from VLAN 2 through Switch, and forwards the packets to Port1.2 at Layer 3.
  2. Before sending the packets out, Port1.2 adds VLAN 3 to the packets so that the packets can reach user hosts in VLAN 3.
The process is reversed when a host in VLAN 3 sends packets to a host in VLAN 2.
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Updated: 2019-05-25

Document ID: EDOC1000097279

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