Configuring Vlan Termination; Overview; Vlan Termination Types; Application Scenarios - HP 6600 Configuration Manual

Configuring VLAN termination

In this chapter, for a packet that carries two or more layers of VLAN tags, the outermost layer of VLAN
tags is called "Layer 1 VLAN tag," and the second outermost layer of VLAN tags is called "Layer 2 VLAN
tag." This also applies to VLAN IDs.

Overview

VLAN termination assigns a VLAN-tagged packet received to the corresponding interface according to
its VLAN tags, and then the interface removes its VLAN tags, and forwards it through Layer 3 or
processes it in another way. Whether the packet is tagged before being sent out depends on the
configuration of the outgoing interface. Before sending a packet, the port adds a VLAN tag to the packet
according to the VLAN termination configuration on the port.

VLAN termination types

VLAN termination includes the following types:
Dot1q termination—Terminates packets which carry one or more layers of VLAN tags and whose
•
outermost VLAN tags match the configured values. Packets sent out of a Dot1q termination interface
are single-tagged.
• QinQ termination—Terminates packets which carry two or more layers of VLAN tags and whose
outermost two layers of tags match the configured values. Packets sent out of a QinQ termination
interface are double-tagged.

Application scenarios

Inter-VLAN communication
Hosts in different VLANs cannot directly communicate with each other. You can use Layer 3 routing to
allow all VLANs to communicate. To allow the specified VLANs to communicate, you can configure
VLAN termination on Layer 3 Ethernet subinterfaces.
In Figure 55, Host A belongs to VLAN 2, and Host B belongs to VLAN 3. After you specify Host A's
gateway IP address as 1.1.1.1/24 and Host B's gateway IP address as 1.1.2.1/24 and configure VLAN
termination, Host A and Host B can communicate at Layer 3 through Layer 3 Ethernet subinterfaces.
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