What is 802.1Q native VLAN?
IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual local area networking (VLANs) on an IEEE 802.3 Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.
What are the three primary options for enabling inter-VLAN routing?
Inter-VLAN Routing Operation Three options include legacy, router-on-a-stick, and a Layer 3 switch using SVIs. Legacy used a router with multiple Ethernet interfaces.
What is 802.1Q router?
The IEEE 802.1Q protocol is used to interconnect multiple switches and routers, and for defining VLAN topologies. The IEEE 802.1Q standard is extremely restrictive to untagged frames. The standard provides only a per-port VLANs solution for untagged frames.
What is the purpose of 802.1Q tagging?
The 802.1Q tagging protocol allows the Ethernet frame size to increase by four bytes to a range of 68 to 1522 bytes. This size increase is due to the insertion of a four-byte VLAN tag into the frame. The tags, which include a VLAN Identifier (VID), are attached to each Ethernet frame by MAC address.
Which is the VLAN not tagged by 802.1 Q?
The “Untagged” designation enables VLAN operation with non 802.1Q-compliant devices. A port can be an untagged member of one protocol-based VLAN of each protocol type. When assigning a port to multiple, protocol-based VLANs sharing of the same type, note that the port can be an untagged member of only one such VLAN.
What is 802.1Q encapsulation?
What is 802.1Q Encapsulation? 802.1Q is the networking standard that defines virtual LANs (VLANs) on an Ethernet network. VLANs are logical networks that share a single physical connection using 802.1Q tagged frames.
What is the function of 802.1Q protocol in a VLAN implementation?
Encapsulating IEEE 802.1Q VLAN tags within 802.1Q enables service providers to use a single VLAN to support customers who have multiple VLANs. The IEEE 802.1Q-in-Q VLAN Tag Termination feature on the subinterface level preserves VLAN IDs and keeps traffic in different customer VLANs segregated.
What is the difference between router-on-a-stick and inter-VLAN routing?
The main advantage of Inter-VLAN routing is that the switch is handling the routing of traffic between the VLANs. In a router-on-a-stick setup, traffic between the VLANs would need to pass through the router multiple times (Tx and Rx).
Which two methods can be used for inter-VLAN routing?
There are two ways in which inter-VLAN routing can be accomplished.
- Traditional inter-VLAN routing.
- Router-on-a-stick.
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 inter-VLAN routing?
This method of inter-VLAN routing relies on a router with multiple physical interfaces. Each interface is usually connected to the switch, one for each VLAN.
Why is there no traffic passing between VLAN1 and the router?
As a result, no traffic will pass between VLAN1 on the switch and the router. In these situations always put the configuration for the native VLAN under the main interface and on the trunk create subinterface for all other VLANS.
How many vlan interfaces are there on a single router?
So there is only one interface for routing all the VLANs. That would pose a challenge because every VLAN requires an interface on a router to facilitate inter-VLAN communications.
How to facilitate inter-VLAN communication with a router?
But, to facilitate inter-VLAN communication, we need to go through a router For the router to route on behalf of a VLAN, it has to have an interface to that VLAN. So, in example if we have three VLANs therefore, we would need three physical interfaces on the router, each assigned with a unique IP address and connected to the respective VLANs.