Selective QinQ
- VLAN ID-based selective QinQ: adds outer VLAN tags based on inner VLAN IDs.
- 802.1p priority-based selective QinQ: adds outer VLAN tags based on 802.1p priorities in inner VLAN tags.
- Traffic policy-based selective QinQ: adds outer VLAN tags based on traffic policies so that differentiated services can be provided based on service types.
Selective QinQ is an extension of basic QinQ and is more flexible. The difference is as follows:
Basic QinQ: adds the same outer VLAN tag to all packets arriving at a Layer 2 interface.
Selective QinQ: adds different outer VLAN tags to packets arriving at a Layer 2 interface based on inner VLAN tags.
In Figure 10-4, Department 1 and Department 2 have multiple offices.
Device |
Interface |
VLAN ID Range |
Outer VLAN ID |
|---|---|---|---|
PE1 |
Port1 |
2 to 500 |
10 |
Port1 |
1000 to 2000 |
20 |
|
Port2 |
100 to 500 |
10 |
|
PE2 |
Port1 |
1000 to 4094 |
20 |
Port2 |
500 to 2500 |
20 |
Department 1 uses VLANs 2 to 500.
Department 2 uses VLANs 500 to 4094.
Port1 on PE1 receives packets from VLANs of Department 1 and Department 2 simultaneously.
Selective QinQ is configured on PE1 and PE2 in the following way to implement communication within each department and isolate the two departments.
Configure outer VLAN tags for packets received on interfaces of PE1 and PE2 according to Table 10-2.
Configure Port3 on PE1 and Port3 on PE2 to allow packets of VLAN 20 to pass.