Why do we use router on a stick for inter VLAN communication?
It is a method of inter-VLAN (virtual local area networks) routing where one router is connected to a switch via a single cable. The router has physical connections to the broadcast domains where one or more VLANs require the need for routing between them.
Which statement about a router on a stick is true?
Which statement about a router on a stick is true? Its data plane routes traffic for a single VLAN over two or more switches. It requires the native VLAN to be disabled. It uses multiple subinterfaces of a single interface to encapsulate traffic for different VLANs.
What is the purpose of router on a stick?
ROUTER-ON-A-STICK, also known as a “one-armed router” is a method for running multiple VLANs over a single connection in order to provide inter-VLAN routing without the need of a Layer 3 switch. Essentially the router connects to a core switch with a single interface and acts as the relay point between networks.
Which functionality does an SVI provide?
A switch virtual interface (SVI) represents a logical Layer-3 interface on a switch. VLANs divide broadcast domains in a LAN environment. Whenever hosts in one VLAN need to communicate with hosts in another VLAN, the traffic must be routed between them. This is known as inter-VLAN routing.
How to configure a router on a stick?
It’s possible to create sub-interfaces on a router. These are virtual interfaces and on each sub-interface we can configure an IP address, basically it looks like this: You can pick any number that you like but I decided to use the VLAN numbers, one sub-interface for VLAN 10 and another for VLAN 20.
What are the subinterfaces for router on a stick?
In the configuration in Example 4-6, the R1 G0/0/1 subinterfaces are configured for VLANs 10, 20, and 99. The router-on-a-stick configuration is complete after the switch trunk and the router subinterfaces have been configured. The configuration can be verified from the hosts, router, and switch.
How is a router connected to a switch?
In our example we use a router to provide Layer 3 connectivity as shown in our diagram. The router uses just a single interface connected to a trunk port on the switch. The Router interface can be divided into two subinterfaces, with each subinterface belonging to the appropriate VLAN.
What is the VLAN of a Cisco router on a stick?
The first host belongs to Network 10.10.10.0/24 (VLAN10) and the second one to 20.20.20.0/24 (VLAN20). By default, if the switch is just a normal Layer 2 switch the two hosts can not communicate between them because they belong to different VLANs and there is no routing.