HP A5830 Configuration Manual page 175

Figure 58 One-to-one VLAN mapping implementation
Customer
Network
Network-side port
Many-to-one VLAN mapping
Implement many-to-one VLAN mapping through the following configurations, as shown in
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 59 Many-to-one VLAN mapping implementation
Customer
network
Network-side port
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
 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.
Inbound
uplink policy
CVLAN Data
CVLAN Data
Outbound
downlink policy
Customer-side port
CVLAN 1 Data
Inbound
uplink policy
CVLAN n Data
CVLAN Data
DHCP snooping table lookup
Customer-side port
168
SVLAN Data
SVLAN Data
Uplink traffic Downlink traffic
SVLAN Data
SVLAN Data
SVLAN Data
Uplink traffic Downlink traffic
SP network
Figure 59:
SP network
Figure 60: