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Operation Manual – VLAN-VPN

H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1

VLAN-VPN Configuration

1-7

[SwitchA-vlan10] quit

[SwitchA] interface Ethernet1/0/2

[SwitchA-Ethernet1/0/2] vlan-vpn tpid 9100

[SwitchA-Ethernet1/0/2] port link-type trunk

[SwitchA-Ethernet1/0/2] port trunk permit vlan 10

# Add Ethernet1/0/1 port of Switch A to VLAN 10 and enable the VLAN-VPN function

for the port.

[SwitchA] interface Ethernet1/0/1

[SwitchA-Ethernet1/0/1] port access vlan 10

[SwitchA-Ethernet1/0/1] vlan-vpn enable

[SwitchA-Ethernet1/0/1] quit

2) Configure Switch B

Because Switch B comes from another manufacturer, the commands involved may

differ from those for S3600 series switches. So only the operations are listed, as shown

below:

z Configure Ethernet3/1/1 and Ethernet3/1/2 ports of Switch B to be trunk ports.

z Add the two ports to VLAN 10.

 Note:

The following describes how a packet is forwarded from Switch A to Switch C.

z As the Ethernet1/0/1 port of Switch A is a VLAN-VPN port, when a packet from the

user’s network side reaches Ethernet1/0/1 port of Switch A, it is tagged with the

default VLAN tag of the port (VLAN 10) and is then forwarded to Ethernet1/0/2 port.

z Because Ethernet1/0/2 port is configured with VLAN-VPN TPID, Switch A changes

the TPID value in the outer VLAN Tag of the packet to 0x9100 and forwards the

packet to the public network.

z The packet reaches Ethernet3/1/2 port of Switch B in the public network. Switch B

forwards the packet to Ethernet3/1/1, which belongs to VLAN 10.

z The packet is forwarded from Ethernet3/1/1 port of Switch B to the network on the

other side and enters Ethernet1/0/2 port of Switch C. Then Switch C forwards the

packet to its Ethernet1/0/1 port, which also belongs to VLAN 10. As Ethernet1/0/1

port is an access port, Switch C strips off the outer VLAN tag of the packet and

restores the original packet.

z It is the same case when a packet travels from Switch C to Switch A.

After the configuration, the networks connecting Switch A and Switch C can receive

data packets from each other.

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