324 CHAPTER 35: VLAN-VPN CONFIGURATION GUIDE
■Configure Switch B
#
vlan 1040
#
interface Ethernet1/0/21
port access vlan 1040
undo ntdp enable
stp disable
vlan-vpn enable
vlan-vpn tpid 9200
#
interface Ethernet1/0/22
port link-type trunk
port trunk permit vlan 1 1040
vlan-vpn tpid 9200
Precautions ■Do not configure VLAN 1040 as the default VLAN of Ethernet 1/0/12 of Switch
A or Ethernet 1/0/22 of Switch B. Otherwise, the outer tag will be removed
before a packet is transmitted.
■This example assumes that Ethernet 1/0/11 of Switch A and Ethernet 1/0/21 of
Switch B are both access ports. If the two ports are trunk or hybrid ports,
specify the default VLAN of the two ports as VLAN 1040, and configure the
ports to send untagged packets of VLAN 1040. For detailed information, refer
to “Port Basic Configuration” in the Configuration Guide for your product.

Configuring BPDU

Tunnel

With the BPDU tunnel feature, a switch can transmit Layer 2 protocol packets
(NDP packets in this example) along tunnels established on the public network,
implementing unified network calculation and maintenance for the private
networks connected through the public network.
Network Diagram Figure112 Network diagram for configuring BPDU tunnel
Networking and
Configuration
Requirements
■Customer 1 and Customer 2 are customer side devices, while Provider 1 and
Provider 2 are edge devices of the service provider. Customer 1 and Customer 2
are connected to Ethernet 1/0/1 of Provider 1 and Ethernet 1/0/4 of Provider 2
respectively.
■Provider 1 and Provider 2 are connected through trunk a link, which permits
packets of all VLANs.
Network
Eth1/0 /1
Eth1/0/2
Eth1/0/3
Customer1 Custom er2
Provider1 Provider2
Eth1/0/4