3 Network Applications
SmartAX MA5606T
Product Description
20
Huawei Technologies Proprietary
Issue 01 (2006-12-08)
In the QinQ application, the packet transmitted in the backbone network has two layers of
802.1Q tags: a public VLAN tag and a private VLAN tag.
Figure 3-3 illustrates the implementation of QinQ, as introduced below:
!
At the user side
The enterprise user traffic adopts xDSL access and is delivered in the VLAN mode. As
shown in Figure 3-3, the users of VLAN 1 and VLAN 2 can access the MA5606, on
which QinQ is enabled. The MA5606T adds a public VLAN tag (VLAN 3) to the user
packet, and forwards the packet to the upstream network.
!
At the network side
In the backbone network, the packet is transmitted using the public VLAN tag. After the
packet reaches the MA5606T on the other side of the backbone network, the MA5606T
removes the public VLAN tag from the packet, and passes the packet to the equipment at
the user side.
Figure 3-3
QinQ application
IP
Internet
Router
MA5606T
Modem
L2
User
User
User
L2
Modem
VLAN 1
VLAN 1
VLAN 2
VLAN 2
VLAN 3
VLAN 3
MA5606T
User
QinQ
private line
3.5 VLAN Stacking Application
The MA5606T supports the VLAN stacking to realize the VLAN extension and private line
wholesale service.
!
When the VLAN extension and user identification are needed, a BRAS is required.
!
When private line wholesale service is needed, the upstream network needs to be in the
L2 working mode so that the packets can be directly transmitted using VLAN IDs and
MAC addresses.
In the VLAN stacking application, the user packet is untagged before reaching the MA5606T.
When the packet reaches the MA5606T, it is tagged with two VLAN tags (outer VLAN and
inner VLAN), and then transmitted to the associated ISP based on the outer VLAN tag. A user
is identified by the inner VLAN tag.
