H3C S3100 Series Operation Manual page 9

Operation Manual (For Soliton) – VLAN-VPN
H3C S3100 Series Ethernet Switches
1) As Ethernet 1/0/11 of Switch A is a VLAN-VPN port, when a packet from the
customer's network side reaches this port, it is tagged with the default VLAN tag of
the port (VLAN 1040).
2) The TPID value of the outer VLAN tag is set to 0x9200 before the packet is
forwarded to the public network through Ethernet1/0/12 of Switch A.
3) The outer VLAN tag of the packet remains unchanged while the packet travels in
the public network, till it reaches Ethernet1/0/22 of Switch B.
4) After the packet reaches Switch B, it is forwarded through Ethernet1/0/21 of
Switch B. As the port belongs to VLAN 1040 and is an access port, the outer VLAN
tag (the tag of VLAN 1040) of the packet is removed before the packet is
forwarded, which restores the packet to a packet tagged with only the private
VLAN tag and enables it to be forwarded to its destination networks.
5) It is the same case when a packet travels from Switch B to Switch A.
Chapter 1 VLAN-VPN Configuration
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