3Com WX3000 operation manual Selective QinQ Configuration Example, Vlan-vpn priority

You are recommended not to configure both the DHCP snooping and selective Q-in-Q function on the device, which may result in the DHCP snooping to function abnormally.

Configuring the Inner-to-Outer Tag Priority Mapping Feature

Configuration Prerequisites

Enabling the VLAN-VPN feature on the current port

Configuration Procedure

Follow these steps to configure the inner-to-outer tag priority mapping feature:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Enter Ethernet port view	interface interface-type	—
	interface-number
Enable the inner-to-outer tag	vlan-vpn priority	Required
priority mapping feature and	old-priority remark	By default, the inner-to-outer tag
create a priority mapping	new-priority	priority mapping feature is not enabled.

Selective QinQ Configuration Example

Processing Private Network Packets by Their Types

Network requirements

As shown in Figure 2-2:

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GigabitEthernet 1/0/3 of Switch A provides public network access for PC users and IP phone users. PC users belong to VLAN 100 through VLAN 108, and IP phone users belong to VLAN 200 through VLAN 230. GigabitEthernet 1/0/5 of Switch A is connected to the public network. The peer end of Switch A is Switch B.

GigabitEthernet 1/0/11 of Switch B is connected to the public network. GigabitEthernet 1/0/12 and GigabitEthernet 1/0/13 of Switch B provide network access for PC servers belonging to VLAN 100 through VLAN 108 and voice gateways (for IP phone users) belonging to VLAN 200 through VLAN 230 respectively.

The public network permits packets of VLAN 1000 and VLAN 1200. Apply QoS policies for these packets to reserve bandwidth for packets of VLAN 1200. That is, packets of VLAN 1200 have higher transmission priority over packets of VLAN 1000.

Employ the selective QinQ feature on Switch A and Switch B to differentiate traffic of PC users from that of IP phone users, for the purpose of using QoS policies to guarantee higher priority for voice traffic.

To reduce broadcast packets in the network, enable the inter-VLAN MAC address replicating feature for selective QinQ.

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