3Com 5500G VLAN-VPN Configuration Guide, Inner tag will be used for packet forwarding, Simple way

35

VLAN-VPN CONFIGURATION GUIDE

Configuring	With VLAN-VPN enabled, a device tags a private network packet with an outer
VLAN-VPN	VLAN tag, thus enabling the packet to be transmitted through the service
	providers’ backbone network with both inner and outer VLAN tags. After reaching
	the peer private network, the packet’s outer VLAN tag will be removed and the
	inner tag will be used for packet forwarding.
	VLAN-VPN tunnels private network packets over the public backbone network in a
	simple way.
Network Diagram	Figure 111 Network diagram for configuring VLAN-VPN
	PC Server
	VLAN100

S w tchBi

E th1/0/21

E th1/0/22

TPID-0x9200

VLAN 1040

E th1/0/12

E th1/0/11

S w ichAt

VLAN200

Term inalServer

Networking and

Configuration

Requirements

As shown in Figure 111, Switch A and Switch B are both Switch 5500s. They connect the users to the servers through the public network.

■The PC users and PC servers are in VLAN 100, while the terminal users and terminal servers are in VLAN 200. Both VLAN 100 and VLAN 200 are private. On the public network, there is VLAN 1040.

■Switches of other vendors are used on the public network. They use the TPID value 0x9200.