Application Scenario Of One-To-Two And Two-To-Two Vlan Mapping - HP A6600 Configuration Manual

Application scenario of one-to-two and two-to-two VLAN
mapping
Figure 67 shows a typical application scenario in which two remote sites of VPN A, Site 1 and Site 2,
must communicate across two SP networks, SP 1 and SP 2.
Figure 67 Application scenario of one-to-two and two-to-two VLAN mapping
One-to-two VLAN
mapping
PE 1
VLAN 2
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 by using one-to-two VLAN mapping.
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 PE4 receives the packet with the new VLAN tag pair, it removes the outer VLAN tag and
3.
forwards the packet to VLAN 3.
Use QinQ to implement one-to-two VLAN mapping. For more information about QinQ, see the chapter
"QinQ configuration."
VLAN 10 VLAN 2 Data
SP 1
Data
VPN A
Site 1
Two-to-two VLAN
mapping
PE 2 PE 3
Traffic
180
One-to-two VLAN
VLAN 20 VLAN 3 Data
SP 2
VLAN 3 Data
VPN A
Site 2
mapping
PE 4
CE a2