H3C Technologies H3C S10500 Series Switches - Manual (Page 207)

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Figure 66 One-to-one VLAN mapping implementation
Many-to-one VLAN mapping
Implement many-to-one VLAN mapping through the following configurations, as shown in Figure 67 :
• Apply an uplink policy to the incoming traffic on the customer-side port to map different CVLAN IDs
to one SVLAN ID. When a packet arrives, the switch replaces its CVLAN tag with the matching
SVLAN tag.
• Configure the network-side port as a DHCP snooping trusted port. For downlink traffic, the switch
looks through the DHCP snooping table, and replaces the SVLAN ID with the CVLAN ID found in
the table.
Figure 67 Many-to-one VLAN mapping implementation
... ...
NOTE:
Each DHCP snooping entry contains information about one DHCP client, including its IP address, MAC
address, and CVLAN. For more information about DHCP snooping, see
Layer 3—IP Services
Configuration Guide.
One-to-two VLAN mapping
Implement one-to-two VLAN mapping through the following configurations, as shown in Figure 68 :
• Apply an uplink policy to the incoming traffic on the customer-side port to tag the incoming packets
from a certain CVLAN with an outer SVLAN tag.
• Configure the customer-side port as a hybrid port, and assign the port to SVLANs as an untagged
member. When the port forwards the packets from these SVLANs, it removes their SVLAN tag.