Contents
What is selective Q-in-Q?
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 Q-in-Q used for?
Information About Q-in-Q Tunnels 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.
What is Q-in-Q in networking?
802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. By using a different VLAN tag for each customer we can separate the traffic from different customers and also transparently transfer it throughout the service provider network.
How do I add a VLAN to a Juniper switch?
To configure a VLAN, follow these steps:
- Create the VLAN by setting the unique VLAN name:
- Configure the VLAN ID or a VLAN ID list for the VLAN.
- Assign at least one interface to the VLAN:
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 a end VLAN?
Untagging a VLAN limits the Port to a single VXC connection. Employing this method means that your Port will only be able to configure a single B-End target, although it will receive all inner/C-Tags from that peer as single/dot1q tagged. Deploy a Megaport Cloud Router.
What does Q in Q stand for?
That’s because it’s a quality name. A quality name that means “Quality tips.” That’s right, the Q stands for quality.
What is difference between bridge and VLAN?
Bridge groups provide a method to group two or more ports into a single broadcast domain, where as VLAN provide a method to group many ports into a single broadcast domain or establish a number of broadcast domains (or secure groups) on a single switch.
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.
What is megaport Vxc?
A VXC (Virtual Cross Connect) is a point-to-point Layer 2 circuit between two endpoints that is mapped with a VLAN ID on each end. You can order VXCs to reach any destination in the Megaport network just like the VXCs used with the physical Ports. You can connect up to 25 VXCs per MCR.
When to use Q-in-Q tunneling in Junos?
Q-in-Q tunneling is useful when customers have overlapping VLAN IDs, because the customer’s 802.1Q (dot1Q) VLAN tags are prepended by the service VLAN (S-VLAN) tag. The Juniper Networks Junos operating system (Junos OS) implementation of Q-in-Q tunneling supports the IEEE 802.1ad standard.
How is selective QinQ used in network engineering stack?
QinQ is a method to tag already tagged frames with an outer frame. It is like a layer-2 tunneling on a trunk. Selective QinQ allows you to tag some of the tagged frames, but not others. Thanks for contributing an answer to Network Engineering Stack Exchange!
When was Q-in-Q introduced in Junos OS?
Q-in-Q was introduced for the EX-series Switch starting with Junos OS Release 9.3. This article provides a summary of how it functions and a configuration example. Note: Additional examples and information can be found in Understanding Q-in-Q Tunneling on EX-series Switches.
When to use Q-in-Q tunneling in 802.1Q?
Using Q-in-Q tunneling, providers can also segregate or bundle customer traffic into fewer VLANs or different VLANs by adding another layer of 802.1Q tags. Q-in-Q tunneling is useful when customers have overlapping VLAN IDs, because the customer’s 802.1Q (dot1Q) VLAN tags are prepended by the service VLAN (S-VLAN) tag.