Cisco Switch Vlans

Posted on 2010-08-27
Last Modified: 2012-05-10

I have a layer 2 switch and is connected to a router in Vlan1 which works fine, is it possibe create another Vlan and connect devices in that vlan to another router and be able to communicate.

i.e. Vlan 1 can connect to the router in vlan 1
      Vlan 2 can connect to the router in vlan 2
Question by:skywalker101
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

ID: 33540107
yes that configuration is called a router on a stick i've attached a couple of links showing a sample configuration.

the cisco example is much more detailed.

hope it helps :-)

Expert Comment

ID: 33540123
I suppose that every router 1 has 2 interfaces, eth0 connected to VLAN 1 and eth1 connected to VLAN 2. In that case, YES, devices connected to VLAN 1 can "communicate" with devices connected to VLAN 2 through the routers.

Remember that VLANs are layer 2 things, router are layer 3. So you'll have to configure IP routing between VLANs 1 and 2.


Author Comment

ID: 33540142
I will have 2 routers one will be for vlan 1 traffic
Another router for vlan 2 traffic
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Expert Comment

ID: 33540207
you don't need to have two routers or two interfaces to route traffic from two vlans. if you have created the two vlans on one switch, the you can configure a router on a stick.

port from the switch connecting to the router would be a trunk port, trunking the two vlans.

port from the router to the switch would be configured as sub interfaces trunking the two vlans effectively having routing between the two vlans. i've placed an example above comment.

Accepted Solution

ffleisma earned 250 total points
ID: 33540420
i've attached a diagram so that you could visualize it, it would really just depends on your requirements.

hope it helps :-)

Expert Comment

ID: 33546736
Vlan's can operate without router.
Router is used only if there is a need for inter-vlan communication.
Router will be the gateway for each particular vlan.
You can use two routers for each vlan or use one router for the two vlan's.
You can also use sub-interfaces if there are limited interfaces in your router.

Featured Post

Manage your data center from practically anywhere

The KN8164V features HD resolution of 1920 x 1200, FIPS 140-2 with level 1 security standards and virtual media transmissions at twice the speed. Built for reliability, the KN series provides local console and remote over IP access, ensuring 24/7 availability to all servers.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Problem Description:   Couple of months ago we upgraded the ADSL line at our branch office from Home to Business line. The purpose of transforming the service to have static public IP’s. We were in need for public IP’s to publish our web resour…
In the hope of saving someone else's sanity... About a year ago we bought a Cisco 1921 router with two ADSL/VDSL EHWIC cards to load balance local network traffic over the two broadband lines we have, but we couldn't get the routing to work consi…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question