Beginner The router then treats the frames tagged with VLAN 10 as if they came in or out of G0/0.10, and the frames tagged with VLAN 20 as if they came in or out G0/0.20.Our network topology will consist of a router and a switch with VLANs 10 and 20, having two computers each. It helps us prove out that the network is doing what it’s supposed to, and if there is an issue with a specific device on the network.Being able to provide this information to manufacturers is essential in getting them to stop the finger-pointing and take a second look at their own product. “Router-on-a-stick” is a type of router configuration in which you are able to use a single physical interface to route traffic between multiple VLANs. It is, in fact, generally a good practice to keep the security VLAN separate from control.These are the things you need to be aware of and make sure that you have enough speed on your firewall so as not to create a bottleneck.If you do run into this issue where you find too much communication between VLANs and your router interface can’t keep up, there’s good news.Generally, you’ll find that whatever needs constant and high-bandwidth communication between VLANs are within the same security realm. Passionate about technology and innovation.Router on a Stick: Introduction and Basic Configuration (with lab files)Router on a Stick: Introduction and Basic Configuration (with lab files) there are a lot of details and pictures. If a device on one VLAN wants to talk to a device on another VLAN, that traffic must leave the switch and pass through the router which “routes” the traffic back to the switch, over the same interface, to the other VLAN.This can be a problem because it can create a bottleneck which can overload the one interface if it’s not fast enough.
You will then issue the commands:This will create VLANs 10 and 20 with their corresponding names, descriptions and ip address.
R1 is the router that will be assuming the role as the router on a stick. It’s possible to create sub-interfaces on a router. Configuration : Here is a topology in which there is a router and a switch and some end hosts. Two of the switches act as Layer 3 switches, combining the functions of a router and a switch, routing between all 12 subnets/VLANs. In our case, there are no pre-configured vlans. Or it can help us diagnose possible errors in our configuration that may cause traffic to go somewhere it wasn’t intended.Not that we don’t do packet monitoring on switches as well – we do.
We will then configure 802.1Q trunking on the router and Let’s get inside the switch to create the VLANs 10 and 20 and assign machines into it.First, issue the show vlan brief to command to check for any existing vlans. That’s because switches have much faster backplane speeds and are much better at forwarding frames (Layer 2) – in this case packets (Layer 3) – to ports on the same switch that reside on another network segment.This is the reason why many people assume that the “router on a stick” method is inferior, and to the uninitiated it makes sense that it would be.What many people fail to realize is that there are some pretty huge benefits to using a router, or more precisely a firewall, to be the gateway between networks.To understand the benefits of putting a firewall in-between segments you must understand something that many people overlook: In other words, any firewall access rules, traffic-shaping, anti-malware scanning, etc., cannot be used on the internal network UNLESS it hits a router interface.This is the reason IP cameras can communicate with an NVR without even needing a gateway address: You can physically remove the router and they’ll still be able to communicate with each other. There are three options available for connecting a router to each subnet on a VLAN:The example network below shows what the second and third option looks like. We will then assign ports fa0/1-2 to VLAN 10 and ports fa0/4-5 to VLAN 20.So, when you now issue the show vlan brief command.