Concepts And Terms - HP 3600 v2 series Configuration Manual

Figure 64 Application scenario of two-to-two VLAN mapping
QinQ or selective
QinQ
PE 1
CE a1
Site 1 and Site 2 are in VLAN 2 and VLAN 3, respectively. The VLAN assigned for VPN A is VLAN 10
in the SP 1 network and VLAN 20 in the SP 2 network.
If Site 1 sends a packet to Site 2, the packet is processed on the way to its destination using the following
workflow:
When the packet tagged with VLAN 2 arrives at the edge of network SP 1, PE 1 tags the packet
1.
with outer VLAN 10 through basic QinQ or selective QinQ.
When the double-tagged packet enters the SP 2 network, PE 3 replaces the outer VLAN tag (VLAN
2.
10) with VLAN 20. Because the packet is destined for Site 2 in VLAN 3, PE 3 also replaces the
inner tag (VLAN 2) of the packet with VLAN 3. This process is two-to-two VLAN mapping.
When PE 4 receives the packet with the new VLAN tag pair, it removes the outer VLAN tag and
3.
forwards the packet to VLAN 3.
NOTE:
For more information about basic QinQ and selection QinQ configurations, see the chapter "QinQ
configuration."

Concepts and terms

Figure 65 shows a simplified network to help explain the concepts and terms that you might encounter
when you work with VLAN mapping.
VLAN 10 VLAN 2 Data
SP 1
VLAN 2 Data
VPN A
Site 1
Two-to-two VLAN
mapping
PE 2 PE 3
Traffic
195
QinQ or selective
VLAN 20 VLAN 3 Data
SP 2
VLAN 3 Data
VPN A
Site 2
QinQ
PE 4
CE a2