Qinq Implementations; Protocols And Standards - H3C S5560S-EI Series Configuration Manual

When a tagged Ethernet frame from CE 1 arrives at PE 1, the PE tags the frame with SVLAN 3. The
double-tagged Ethernet frame travels over the service provider network until it arrives at PE 2. PE 2
removes the SVLAN tag of the frame, and then sends the frame to CE 4.
Figure 59 Typical QinQ application scenario
VLANs 1 to 20
Customer
network B
PE 1
Customer
network A
VLANs 1 to 10

QinQ implementations

QinQ is enabled on a per-port basis. The link type of a QinQ-enabled port can be access, hybrid, or
trunk. The QinQ tagging behaviors are the same across these types of ports.
A QinQ-enabled port tags all incoming frames (tagged or untagged) with the PVID tag.
•
If an incoming frame already has one tag, it becomes a double-tagged frame.
•
If the frame does not have any 802.1Q tags, it becomes a frame tagged with the PVID.
QinQ provides the most basic VLAN manipulation method to tag all incoming frames (tagged or
untagged) with the PVID tag. To perform advanced VLAN manipulations, use VLAN mappings or
QoS policies as follows:
•
To add different SVLANs for different CVLAN tags, use one-to-two VLAN mappings.
•
To use criteria other than the CVLAN ID to match packets for SVLAN tagging, use the QoS nest
action. The QoS nest action can also be used with other actions in the same traffic behavior.
For more information about VLAN mappings, see
information about QoS, see ACL and QoS Configuration Guide.

Protocols and standards

•
IEEE 802.1Q, IEEE Standard for Local and Metropolitan Area Networks-Virtual Bridged Local
Area Networks
•
IEEE 802.1ad, IEEE Standard for Local and Metropolitan Area Networks-Virtual Bridged Local
Area Networks-Amendment 4: Provider Bridges
CE 3
CVLAN B Data
SVLAN 4 CVLAN B Data
SVLAN 3 CVLAN A Data
Service provider network
CVLAN A Data
CE 1
SVLAN 3
Internet
SVLAN 4
"Configuring VLAN
175
VLANs 1 to 10
CE 4
CVLAN A Data
CVLAN A Data
CVLAN B Data
CVLAN B Data
CE 2
VLANs 1 to 20
mapping." For more
Customer
network A
PE 2
Customer
network B