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

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

In Figure 8-2, SwitchA is a Layer 3 switch configured with sub-interfaces and SwitchB is a Layer 2 switch. SwitchA connects to SwitchB through a Layer 3 Ethernet interface. User hosts are assigned to VLAN 2 and VLAN 3, and need to communicate with each other.

Figure 8-2  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 SwitchA to SwitchB.

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

  • 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 SwitchB, 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.
Updated: 2019-08-21

Document ID: EDOC1000142081

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