H3C Technologies H3C S10500 Series Switches - Manual (Page 206)

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Figure 65 Basic concepts of VLAN mapping
• Uplink traffic: Traffic transmitted from the customer network to the service provider network.
• Downlink traffic: Traffic transmitted from the service provider network to the customer network.
• Network-side port: A port connected to the service provider network.
• Customer-side port: A port connected to the customer network.
• Uplink policy: A QoS policy that defines VLAN mapping rules for uplink traffic.
• Downlink policy: A QoS policy that defines VLAN mapping rules for downlink traffic.
• Customer VLANs (CVLANs): VLANs assigned for customers.
• Service provider VLANs (SVLANs): VLANs assigned for transmitting traffic across the service
provider network.
NOTE:
For more information about QoS policies, see ACL and QoS Configuration Guide.
VLAN mapping implementations
This section describes how VLAN mapping is implemented on your device.
One-to-one VLAN mapping
Implement one-to-one VLAN mapping on the customer-side port through the following configurations, as
shown in Figure 66 :
• Apply an uplink policy to the incoming traffic, mapping each CVLAN ID to a unique SVLAN ID.
When a packet arrives, the switch replaces its CVLAN ID with the matching SVLAN ID.
• Apply a downlink policy to the outgoing traffic, mapping each SVLAN ID back to its corresponding
CVLAN ID. When forwarding a packet out of the port, the switch replaces its SVLAN ID with the
matching CVLAN ID.