Vlan why

It works in multi-protocol environments. This method is not practical in a predominately IP based network. The configurations of tables are shared among all device ports. Skip to content. What is VLAN? How to Increase Upload Speed. Report a Bug. Previous Prev. Next Continue. Home Testing Expand child menu Expand. SAP Expand child menu Expand. Web Expand child menu Expand. For instance, hosts use ARP requests broadcasts to resolve layer-3 to layer-2 addresses.

Multicasts are are flooded to every port in the broadcast domain, albeit IGMP snooping, if supported and configured, can mitigate this behavior. Logical segmentation of networks is defined as Vlan. Vlan itself is broadcast domain. Traffic can be isolated with the help of vlans. It ensures group of devices available in multiple networks to be combined into one logical network.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why do we use VLAN? Ask Question. Asked 5 years, 8 months ago. Active 9 months ago. Viewed 7k times. Improve this question. Add a comment. Active Oldest Votes.

Improve this answer. You can immediately increase the available cumulative bandwidth for the 5 users without upgrading to Gbit. There are other scenarios that shouldn't be too hard to come up with, but reality is the best teacher. I'm sure some users here on Spice Works can relate anecdotal stories. In my network, consisting of several satellite offices connected through a "metro-ethernet" setup from a local provider which has each office is on a separate VLAN which comes to our main office with some more beefy equipment.

The main office has an additional VLAN piped in on the same cable that gives us Internet connectivity. This allows us to have one content filter at our main office to manage which prevents people at all offices from going to sites that are We are also in the process of implementing MAC authentication.

Essentially, every device plugged into our network has the mac-address stored in a RADIUS server, and the switch puts that specific port into a offline state until it can identify the MAC. I know many people will argue about the lack of security when it comes to MAC-based authentication MAC address can be, and frequently are, spoofed and I agree with them It may not be the best concept of security, and a bit paranoid, but it's better than nothing.

There are many reasons to use VLANs, and many situations where there is little need for them. It's hard to give advice on the subject, with little information. VLANs will split broadcast domains with a router-on-a-stick config , therefore avoiding broadcast storms. Matthew : Did you get your question answered? Any BA's or HP's to give out? Sorry, I've been rude.

The last couple of weeks were not good ones so I neglected this post. Tons of great info was provided to me here. Thanks everyone for the great info and great ideas. I start configuring my VLANs this week and have a much better understanding and some good ideas of how to use them. I stumbled across this post recently in my quest for making since of the 39 VLANs we currently have in a company with less than users and devices. KevinRitchey's post should be put into a book To continue this discussion, please ask a new question.

Spiceworks Help Desk. The help desk software for IT. Track users' IT needs, easily, and with only the features you need. Learn More ». Get answers from your peers along with millions of IT pros who visit Spiceworks.

Best Answer. Hi Matthew, It looks like you've done your homework, so if this is too basic, please don't be insulted. View this "Best Answer" in the replies below ». Zak This person is a verified professional. Verify your account to enable IT peers to see that you are a professional. An example is like keeping your computers traffic from bumping into your email servers traffic. Matthew wrote: [A] I see a lot of layer 2 switches with layer 3 static routing included.

To be more specific in my answer, I lettered yours A - F; here's my take [A] I really don't think you need a layer 3 switch. But to review - logical separate, broadcast separation, security and QoS. VLANs and Security Switches separate traffic so that when you plug your laptop into a switch port the only traffic you should be able to hear is the traffic that is sent directly to you, or is part of a broadcast or multicast frame. Generally switches are located in secure areas. Matthew Jan 13, at UTC.

Thanks, MJ. Consider for example this scenario: You have a megabit network running on CAT5 with 8 users, 3 of which are using a video conferencing solution 6 hours a day. Brett Jan 14, at UTC. Pure Capsaicin.