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RC1201-2GE16E1T1 Product Description
Figure 3-5 Typical networking for basic QinQ
As shown in Figure 3-5, the RC1201-2GE16E1T1 is the Provider Edge (PE).
A packet is sent to the PE by a customer device, and the packet carries a Tag VLAN 100.
When passing through the user side port of the PE, the packet is added with an outer Tag
VLAN 200. And then the packet is sent to the ISP network through the uplink port of the PE.
When the packet with the outer Tag VLAN200 is sent to the other PE, this PE will remove the
outer Tag for the packet and then send the packet to the other customer equipment. Now, the
packet carries the TAG VLAN 100 only.
With basic QinQ, the Internet VLAN IDs with limited quantity can be relieved so that users
can plan their VLAN IDs on their own without conflicting with public network VLAN IDs.
Selective QinQ
The selective QinQ is an enhanced application for basic QinQ. Based on some features, the
selective QinQ can perform traffic classification on users' data. By adopting port, VLAN or
both of them, the selective QinQ encapsulates different data traffic with different VLAN Tags.
The selective QinQ makes the ISP's network architecture flexible. With the selective QinQ,
devices can classify customer devices on the port that is connected to the access layer,
encapsulating different outer Tag for various customer devices. In addition, the selective
QinQ adopts the outer Tag to configure the QoS policy in the public network, flexibly
configure the data transmission priority, and provide related services for users.
3.4.4 VLAN mapping
VLAN Mapping is mainly used to replace the private VLAN Tag of Ethernet packets with
ISP's VLAN Tag, making packets transmitted according to ISP's VLAN forwarding rules.
During packets are sent to the peer private network from the ISP network, the VLAN Tag is
restored to the original private VLAN Tag, according to the same VLAN forwarding rules.
Therefore packets are correctly sent to the destination.
When the RC1201-2GE16E1T1 receives packets with private VLAN Tag, the RC1201-
2GE16E1T1 will match the private VLAN Tag according to configured VLAN mapping rules.
If success, the private VLAN Tag is replaces according to configured VLAN mapping rules.
The RC1201-2GE16E1T1 supports 1:1 VLAN mapping only; that is, it replaces VLAN Tag
of packets from a specified VLAN with new VLAN Tag.
Different from QinQ, VLAN mapping does not encapsulate packets with multi-layer VLAN
Tags but modify VLAN Tags so that packets are transmitted as configured by the ISP.
Raisecom Technology Co., Ltd.
3 Service functions and features
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