H3C Technologies H3C S5560 Series Switches - Manual (Page 249)

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Figure 64 Basic VLAN mapping terms
One-to-one VLAN mapping
As shown in Figure 65 , one-to-one VLAN mapping is implemented on the customer-side port and
replaces VLAN tags as follows:
• Replaces the CVLAN with the SVLAN for the uplink traffic.
• Replaces the SVLAN with the CVLAN for the downlink traffic.
Figure 65 One-to-one VLAN mapping implementation
Many-to-one VLAN mapping
As shown in Figure 66 , many-to-one VLAN mapping is implemented on both the customer-side and
network-side ports as follows:
• For the uplink traffic, the customer-side many-to-one VLAN mapping replaces multiple CVLANs with
the same SVLAN.
• For the downlink traffic, the network-side many-to-one VLAN mapping replaces the SVLAN with the
CVLAN found in the DHCP snooping table or ARP snooping table. For more information about
DHCP snooping or ARP snooping, see Layer 3—IP Services Configuration Guide.
SP
Network-side port
Customer-side port
Uplink traffic
Downlink traffic