Exam: Cisco 200-301 - Cisco Certified Network Associate (CCNA)
We in this chapter will take up the topic of “configure and verify VRF lite”. This is a topic that you will find under the exam number 300-101 route. It appears under the main topic of layer three technologies. It is a closed book exam and the questions are objective type this is why it is essential that you prepare the topic well and prepare it from the exam point of view.
Let us first understand what VRF lite is. Well it is nothing but the extension of IP routing and provides a number of routing instances.VRF lite is the short form of “VPN routing and forwarding lite” for the ML- series cards. It is made in such a way that it will provide a separate IP routing and forwarding table for each of the VPN.
It is used along with the multi protocol internal BGP (MP-IBGP). In a ML series the VRF implementation is without the MP-IBGP. If the ML series comes with a VRF lite it will be considered as a PE-extension or a customer equipment extension. The CE extension can have multiple VRFs and can serve a number of customers with just one CE box.
You will also at times notice that VRF lite on a ML series CE can have a number of subinterfaces and interfaces with the PE for different customers. However, a normal CE will have only one customer. The routing information of the VRF is considered locally and it will not distribute the VRF to the connected PE. Sometimes it will also use the VRF information for directing the traffic to the correct subinterface or interface. This happens when the traffic is received from the customers or from an internet service provider.
The interfaces in a VRF can be both physical and logical. The physical interfaces are Ethernet ports. The logical interfaces are SVIs and VLANs. In case of layer three technologies you must remember that it cannot belong to more than one VRF at a given time. VRF lite can support the cat 4500. However, it does not include the provider edge MPLS functionality. It will also not include MPLS control plane and MPLS label switching. These are not supported in the VRF lite implementation. You must keep these points in mind as a network administrator. The VRF lite interfaces always need a layer three interface. Some of the points that you must keep in mind as you configure the VRF lite are:
Now that you have got a good idea of what the VRF lite actually is we will now move on to discuss how you can configure the same. The steps that you will have to follow are as mentioned below:
We will now discuss how to monitor and verify the VRF lite. We will basically give a list of some commands that you can use in order to monitor and verify the VRF lite that you have configured using the above steps that we have discussed:
The topic is vast but these are all that you need to know from the CCNP exam point of view these are the points that you must know well and also try to prepare for the exam on these lines. It will help you to get a better score and do well in the exam.
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