Contents
What is CTAG and stag?
802.1q supports 12 bit VLAN id field, which amounts to 4096 VLANs. Thus, a single service provider can carry traffic for a maximum of 4096 customer VLANs. STAG addition before the CTAG. Advantages of Q-in-Q : It provides 4k * 4k (nearly 16 M) VLAN Ids, which can meet the shortage of VLAN ID resources.
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 VLAN mapping?
VLAN Mapping provides a mechanism for Service Providers to translate CVLANs to SVLANs when a packet enters its network and vice-versa, when it leaves the network. VLAN translation is enabled on a per-port basis, where a CVLAN is mapped to an SVLAN.
What is C tag?
C-Tag is an abbreviation of Customer VLAN tag. The IEEE standard 802.1ad provides for double-tagging by service providers so that they can use VLANs allocated internally together with traffic already tagged as VLANs by service provider customers.
What’s the difference between inner and outer VLAN IDs?
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.
What makes the outer planets different from the inner planets?
The outer planets, also known as gas giants, comprise of relatively large planets Jupiter, Saturn, Uranus, and Neptune. As discussed earlier they are situated far from the sun. These planets are mainly composed of gases like hydrogen, helium, methane, etc. Their density is relatively low but they are large in size.
Which is the inner planet closest to the Sun?
The first eight planets of our solar system (Excluding the asteroid Pluto) are divided into inner planets and outer planets. Planets which are closest to the sun, the innermost planets, are categorized as inner planets, that are Mercury, Venus, Earth, and Mars.
What does the outer VLAN id represent in DSLAM?
• When deploying Gigabyte Ethernet DSL Access Multiplexer (DSLAM) in wholesale model, you can assign the inner VLAN ID to represent the end-customer virtual circuit (VC) and assign the outer VLAN ID to represent the service provider ID.