What is QinQ used for?
What is QinQ used for?
In Q-in-Q tunneling, as a packet travels from a customer VLAN (C-VLAN) to a service provider’s VLAN, a customer-specific 802.1Q tag is added to the packet. This additional tag is used to segregate traffic into service-provider-defined service VLANs (S-VLANs).
What is 802.1Q tunneling?
802.1Q tunneling enables Service Providers to use a single VLAN to support customers who have multiple VLANs, while preserving customer VLAN IDs and keeping traffic in different customer VLANs segregated. A port configured to support 802.1Q tunneling is called a tunnel port.
How do I configure QinQ?
To configure the switch, follow these steps:
- Enable QinQ: Edge l(config)#: qinq svlan tag-type 88a8.
- Reboot the box with the configuration saved to transfer into svlan bridge mode.
- Configure S-VLANs and ports connected to the customer network.
- Configure the provider ports leading to the core of the provider network.
What is selective QinQ?
Selective Q-in-Q is the way to achieve Q-in-Q per CVLAN basis, where you have the flexibility to selectively choose and add service VLAN tag based on the customer VLAN.
What is the difference between Dot1q and QinQ?
The original 802.1Q specification allows a single Virtual Local Area Network (VLAN) header to be inserted into an Ethernet frame. QinQ allows multiple VLAN tags to be inserted into a single frame, an essential capability for implementing Metro Ethernet network topologies.
What is the difference between 802.1Q and 802.1 ad?
802.1ad is a protocol for carrying VLAN traffic on an Ethernet. It is based upon 802.1Q, but allows for VLANs to be nested by adding two tags to each frame instead of one (a technique commonly known as VLAN stacking or QinQ). It also makes it possible to have more than the 4094 separate VLANs allowed by 802.1Q.
What is Cisco QinQ?
A Q-in-Q VLAN tunnel enables a service provider to segregate the traffic of different customers in their infrastructure, while still giving the customer a full range of VLANs for their internal use by adding a second 802.1Q tag to an already tagged frame.
Which types of interfaces can be configured with selective QinQ?
You are advised to configure selective QinQ on a hybrid interface. Selective QinQ can take effect on the interface only in the inbound direction.
What is inner VLAN and outer VLAN?
Within an Ethernet Frame, these two tags are often known as “Inner tag” and “Outer tag”. “Inner tags” contain VLAN information that belong to the traffic of the NSP’s customers. The “Outer tags” contains information relating to the NSP’s VLAN networks.
What is ISL and DOT1Q?
ISL and DOT1Q are 2 encapsulation standards supporting Virtual LANs (VLANs) on an Ethernet network. These are the 2 frame tagging protocols that Cisco supports. The tagging protocol can be manually specified on a trunk port, or dynamically negotiated using Cisco’s proprietary Dynamic Trunking Protocol (DTP).