What is QinQ VLAN?

QinQ is an amendment to the IEEE 802.1Q specification that provides the capability for multiple VLAN tags to be inserted into a single Ethernet frame. Single tag translation, where you map a customer to a VNI and preserve the service as an inner VLAN inside a VXLAN packet.Click to see full answer. Keeping this in view, what is QinQ used for?QinQ allows multiple VLAN tags in an Ethernet frame; together these tags constitute a tag stack. When used in the context of an Ethernet frame, a QinQ frame is a frame that has 2 VLAN 802.1Q headers (double-tagged).Beside above, what is inner VLAN and outer VLAN? The command accepts an Outer VLAN ID and one or more Inner VLAN IDs. The outer VLAN ID always has a specific value, while inner VLAN ID can either be a specific value or a range of values. A subinterface that is configured with a single Inner VLAN ID is called an unambiguous Q-in-Q subinterface. Additionally, what is QinQ tunneling? 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.What is service VLAN?The inner tag or inner tags are set by the customer, so the vlans that span the customer network. Also known as the Customer Tag or cVLAN. The outer tag is set by the provider: It is also referred as a Service Vlan or Provider vlan or sVLAN. This vlan will carry the customer vlan’s to the required locations.