What is inter-VLAN routing?
Inter-VLAN routing is the process of forwarding network traffic from one VLAN to another VLAN. There are three inter-VLAN routing options: Legacy Inter-VLAN routing: This is a legacy solution. It does not scale well. Router-on-a-Stick: This is an acceptable solution for a small- to medium-sized network.
What is the purpose of inter-VLAN routing and VLAN trunking?
In this type of inter-VLAN routing, the interface connecting the router to the switch is usually a trunk link. The router accepts traffic that is tagged from the VLANs on the switch through the trunk link. On the router, the physical interface is divided into smaller interfaces called subinterfaces.
What is inter-VLAN routing on a Layer 3 switch?
Inter-VLAN routing using a Layer 3 switch is simpler to configure than the router-on-a-stick method. After the configuration is complete, the configuration can be verified by testing connectivity between the hosts. From a host, verify connectivity to a host in another VLAN using the ping command.
Why do we use VLAN routing?
You can use VLAN routing to allow more than one physical port to reside on the same subnet, to span a VLAN over multiple physical networks, or to provide additional segmentation or security.
How do you communicate between two VLANs?
There are three methods of permitting traffic to flow between VLANs:
- Configure a router and connect a single interface to a switch per VLAN configured.
- Configure a router to use IEEE 802.1Q and connect to a switch via a trunk.
- Configure (and possibly purchase) a Layer 3–capable switch.
Can you have 2 VLANs on the same subnet?
Of course you can do that, but it is not the recommended way. VLANs use software to emulate separate physical LANs. Each VLAN is thus a separate broadcast domain and a separate network. As you have identified, routing between these VLANs would be difficult, because they are the same subnet.
CAN Layer 2 switches do VLAN routing?
You can configure one or more VLANs to perform Layer 2 bridging. Thus, MX Series routers or EX Series switches can function as Layer 2 switches, each with multiple bridging, or broadcast, domains that participate in the same Layer 2 network. You can also configure Layer 3 routing support for a VLAN.
CAN Layer 2 switches do inter VLAN routing?
Devices in the same VLAN can communicate without any routing, and devices in different VLANs require routing to communicate with each other. L2 switches require an L3 routing device to communicate between different VLANs, and the device is either an external router or Layer 3 module on the same chassis.
Can a switch route between VLANs?
You need to have either a router or a Layer-3 switch in order to forward traffic between different VLANs (different subnets).
How are VLANs communicated between switches?
A device called a router handles requests for devices to communicate when not belonging to the same VLAN. This function is called interVLAN routing. The router will have programmed an IP (Internet protocol) address on each of it’s connected VLAN networks.
Is VLAN tagging Layer 2 or Layer 3?
VLANs are data link layer (OSI layer 2) constructs, analogous to Internet Protocol (IP) subnets, which are network layer (OSI layer 3) constructs.
Which method is used to route between VLANs?
Three options are available for routing between VLANs:
- Use a router, with one router LAN interface connected to the switch for each and every VLAN.
- Use one router interface with trunking enabled.
- Use a Layer3 switch, a device that performs both the switching and routing operations.