Siemens S223 - Manual (Page 184)

UMN:CLI User Manual
SURPASS hiD 6615 S223/S323 R1.5
184 A50010-Y3-C150-2-7619
8.1.8 QinQ
QinQ or Double Tagging is one way for tunneling between networks
T U
T U
T T T
U
U
T
T
T
VLAN 200
VLAN 200
VLAN 201
VLAN 201
VLAN 641 PVID 641
T: Tagged
U: Untagged
Customer A Customer A
Customer B
Customer B
Trunk Port
Trunk Port
Tunnel Port
Tunnel Port
Tunnel Port
Tunnel Port
Fig. 8.2 Example of QinQ Configuration
If QinQ is configured on the hiD 6615 S223/S323, it transmits packets adding another Tag
to original Tag. Customer A group and customer B group can guarantee security because
telecommunication is done between each VLANs at Double Tagging part.
Double tagging is implemented with another VLAN tag in Ethernet frame header.
Preamble Destination Source 802.1Q VLAN Tag Type/Length LLC Data FCS
TPID 8100 Priority Canonical 12-bit identifier
VLAN Ethernet Frame
Preamble Destination Source 802.1Q VLAN Tag Type/Length LLC Data FCS VLAN Tag
TPID 8100/9100 Priority Canonical 12-bit identifier TPID 8100 Priority Canonical 12-bit identifier
Ethernet Frame using 802.1Q Tunneling
Fig. 8.3 QinQ Frame
Port which connected with Service Provider is Uplink port (internal), and which connected
with customer is Access port (external).
Tunnel Port
By tunnel port we mean a LAN port that is configured to offer 802.1Q-tunneling support. A
tunnel port is always connected to the end customer, and the input traffic to a tunnel port
is always 802.1Q tagged traffic. The different customer VLANs existing in the traffic to a
tunnel port shall be preserved when the traffic is carried across the network
Trunk Port
By trunk port we mean a LAN port that is configured to operate as an interswitch link/port,