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 dot1q 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.
What is the difference between dot1q and QinQ?
VLAN packets are classified into dot1q packets, which carry only one VLAN tag, and QinQ packets, which carry two VLAN tags. Dot1q termination: terminates packets that carry one VLAN tag. QinQ termination: terminates packets that carry two VLAN tags.
What is Q in Q used for?
Q-in-Q, also known as 802.1ad, is a protocol commonly used by network service providers (NSPs) to provide more Layer 2 flexibility. Q-in-Q allows multiple VLAN tags to be inserted into a single Ethernet frame.
What is VLAN 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.
What is second dot1q?
Router(config-subif)# encapsulation dot1q 100 second-dot1q 200. (Required) Enables the 802.1Q encapsulation of traffic on a specified subinterface in a VLAN. • Use the second-dot1q keyword and the vlan-id argument to specify the VLAN tags to be terminated on the subinterface.
Why is QinQ used?
The general purpose of QinQ is to allow frames from multiple customers to be forwarded (or tunneled) through another topology (provider network) using service VLANs or S-VLANs.
What is Svlan and Cvlan?
CVLAN tag—Identifies the VLAN to which the frame belongs when it is transmitted in the customer network. SVLAN tag—Identifies the VLAN to which the QinQ frame belongs when it is transmitted in the service provider network. The service provider allocates the SVLAN tag to the customer.
What is QinQ translation?
VLAN Translation includes the VLAN tunneling feature and the VLAN mapping one to one feature. This feature is known as “double tagging” or QinQ, because in addition to the regular 802.1Q tag (Customer VLAN/C-VLAN), the switch adds a second ID tag known as a Service Tag (S-VLAN), to forward traffic over the network.
What is double VLAN tagging?
Double-tagging is a method by which the attacker tries to reach a different VLAN using the vulnerabilities in the trunk port configuration. When the switch receives the frame, it sees the outer tag as native VLAN and therefore discards the outer tag. …
What is Cvlan and Svlan?
What does QinQ stand for?
QINQ
| Acronym | Definition |
|---|---|
| QINQ | 802.1q in 802.1q Tunneling |
How to configure Q-in-Q tunneling in Cisco?
Configuration of Q-in-Q tunnelling in Cisco is very simple. First let’s configure ISP inside links. We need to make sure, our mtu is enough to add extra tag for Q-in-Q tunnel.
Can a VPC support Q-in-Q tunneling?
Note Q-in-Q is supported on port channels and vPC. To configure a port channel as an asymmetrical link, all ports in the port channel must have the same tunneling configuration. Using the 802.1Q tunneling feature, service providers can use a single VLAN to support customers who have multiple VLANs.
Why do we need QinQ in Cisco switches?
QinQ 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. For more information about QinQ, see http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/configuration/guide/dot1qtnl.html.
What do you call a tunnel port in 802.1Q?
A port configured to support 802.1Q tunneling is called a tunnel port. When you configure tunneling, you assign a tunnel port to a VLAN that is dedicated to tunneling. Each customer requires a separate VLAN, but that VLAN supports all of the customer’s VLANs.