Qinq; Subnet Vlan; Figure 2 Qinq Typical Networking - Zte ZXR10 5900 Series User Manual

ZXR10 5900/5200 Series User Manual (Ethernet Switching Volume)

QinQ

QinQ, also known as VLAN stack, is a graphic name for the IEEE
802.1Q based tunnel protocol. QinQ technology encapsulates the
original VLAN tag (inner tag) with another VLAN tag (outer tag) so
that the inner tag is masked.
QinQ implements simple Layer 2 VPN (L2VPN) without protocol
support, applicable to small-sized LANs with L3 switches as their
core.
QinQ typical networking is shown in Figure 2. Port to the cus-
tomer network is called the customer port. The port to the Service
Provider network is called the uplink port, and the SP edge access
device is called Povider Edge (PE).
F 2 Q Q T N
IGURE IN YPICAL ETWORKING
The customer network is usually connected to the PE through trunk
VLAN. Uplinks ports in the SP network are connected symmetri-
cally in the trunk VLAN mode.
When a packet (tagged/untagged) from customer network 1
reaches the customer port of switch A. Switch A attaches an outer
tag (VLAN ID as 10) to its forcibly. Within the SP network, packet
is forwarded to all ports in VLAN 10. This packet finally arrives at
switch B. Switch B recognizes that the port to customer network
2 is a customer port, then dispatches the outer tag complying
with the traditional 802.1Q to restore the original packet. Switch
B sends the packet to customer network 2.
Thus data is transparently transmitted between customer net-
works 1 and 2 through the SP network. This allows the customer
considerable flexibility for Private VLAN ID planning, without any
conflict with those of the SP network.

Subnet VLAN

Subnet-based VLAN applies to L2 VLAN networks for flexible con-
figuration of data frame forwarding. Subnet-based VLAN forward
a data frame to a VLAN based on the source IP address. This
source IP address based VLAN can forward user data from differ-
ent subnets cross several VLANs, while remain the original VLAN
membership unchanged.
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