2
Figure 1 Application scenario of one-to-one and many-to-one VLAN mapping
As shown in Figure 1, the network is implemented as follows:
• Each home gateway uses different VLANs to transmit the PC, VoD, and VoIP services.
• To further subclassify each type of traffic by customer, configure one-to-one VLAN mapping on
the wiring-closet switches. This feature assigns a separate VLAN to each type of traffic from
each customer. The required total number of VLANs in the network can be very large.
• To prevent the maximum number of VLANs from being exceeded on the distribution layer
device, configure many-to-one VLAN mapping on the campus switch. This feature assigns the
same VLAN to the same type of traffic from different customers.
One-to-two and two-to-two VLAN mapping
One-to-two and two-to-two VLAN mapping are typically used to implement communication across
different SP networks, as shown in Figure 2.
VLANs 101 and 102 -> VLAN 501
VLANs 201 and 202 -> VLAN 502
VLANs 301 and 302 -> VLAN 503
...
Campus switch
Distribution
network
DHCP client
DHCP server
...
Wiring-closet
switch
VLAN 1 -> VLAN 101
VLAN 2 -> VLAN 201
VLAN 3 -> VLAN 301
VLAN 1 -> VLAN 102
VLAN 2 -> VLAN 202
VLAN 3 -> VLAN 302
PC
VoD
VoIP
VLAN 2
Home gateway
VLAN 1
VLAN 3
PC
VoD
VoIP
VLAN 2
Home gateway
VLAN 1
VLAN 3
Wiring-closet
switch
VLAN 1 -> VLAN 199
VLAN 2 -> VLAN 299
VLAN 3 -> VLAN 399
VLAN 1 -> VLAN 200
VLAN 2 -> VLAN 300
VLAN 3 -> VLAN 400
PC
VoD
VoIP
VLAN 2
Home gateway
VLAN 1
VLAN 3
PC
VoD
VoIP
VLAN 2
Home gateway
VLAN 1
VLAN 3
...
VLANs 199 and 200 -> VLAN 501
VLANs 299 and 300 -> VLAN 502
VLANs 399 and 400 -> VLAN 503
... ...
... ...
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