Does each VLAN need its own router?
No, VLANs don’t require different subnets. Different subnets require different subnet addresses if they ever need to be able to route and/or talk to each other) and by extension if one VLAN wants to talk to a different VLAN it must use different addresses so we can make a routing decision to the right place.
What is the purpose of 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 I make VLANs see each other?
The simplest way to enable routing between the two VLANs to simply connect an additional port from each VLAN into a Router. The Router doesn’t know that it has two connections to the same switch — nor does it need to. The Router operates like normal when routing packets between two networks.
Can 2 VLANs have 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.
What is VLAN on router?
A virtual LAN (VLAN) is a local area network that maps devices on a basis other than geographic location, for example, by department, type of user, or primary application. Traffic that flows between different VLANs must go through a router, just as if the VLANs are on two separate LANs.
Do you need a router to route between VLANs?
In the same way, a Router is what we will need in order for hosts in different VLANs to communicate with one another. There are three options available in order to enable routing between the VLANs: Router with a Separate Physical Interface in each VLAN. Router with a Sub-Interface in each VLAN. Utilizing a Layer 3 Switch.
How to establish communications between VLANs?
When implementing this design, an 802.1Q trunk is configured between a Layer 2 switch and a router that supports 802.1Q. This trunk allows all of the traffic from the configured VLANs to be transmitted and routed via a single routed interface. The router manages and routes all traffic from one VLAN to another via this single interface.
How to setup VLAN routing with router 802.1Q trunks?
In this sample chapter from CCNA 200-301 Official Cert Guide, Volume 1, Wendell Odom discusses the configuration and verification steps related to three methods of routing between VLANs with three major sections: VLAN Routing with Router 802.1Q Trunks, VLAN Routing with Layer 3 Switch SVIs, and VLAN Routing with Layer 3 Switch Routed Ports.
What kind of switch to use between VLANs?
All VLANs over a single interface The third option for routing traffic between VLANs is to use a Layer 3 switch. This switch is capable of routing traffic from VLAN to VLAN internally, but it tends to be quite a bit more expensive than a Layer 2 switch.