Configure And Verify VRF Lite

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:

  1. A switch that has VRF lite will be shared by a number of customers. Each of these customers will have their own routing tables.
  2. The VRF lite will allow multiple customers to use the VRF tables as a result the same IP address can be used again. Overlapped IP addresses are also allowed at times in different VPNs.
  3. The VRF lite will also not support the ISIS and IGRP.
  4. If you want to configure a multicast on the same layer 3 interface at the same time it may not be possible.
  5. The VRF lite will also not affect the packet switching rate.
  6. The customer can use multiple VLANs but the VLAN should not overlap with the VLAN of the other customers.

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:

  1. First you will have to enter the VRF configuration mode and then assign the VRF name.
  2. As a second step create a VPN route distinguisher with the help of the command – router (config-vrf) #rd router-distinguisher. The RD will help you to create forwarding and routing table. It will also specify the default route distinguisher for the VPN that is in use. The RD will always be added to as a prefix to the customers IPv4. The RD can be a 32 bit number or a 16 bit number.
  3. As the third step you will have to create a list of export and import route target communities for the specified VRF.
  4. The fourth step is an optional one. In this you are needed to associate the specified route map with the VRF.
  5. In the fifth step you are required to exit the configuration mode you are in and enter the global configuration mode.
  6. As a sixth step you will have to specify the interface and enter the interface configuration mode.
  7. In this stage you are needed to associate the VRF with the subinterface or the interface.
  8. In this step you will have to leave the privileged EXEC mode by using the command router (config- if) # end.
  9. The last step that we are about to discuss is considered optional. What you are required to do in this is save the changes that you have made in the configuration to NVRAM.

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:

  1. If you want to display the IP routing table for a VRF the command that you will need to use is router # show ip route vrf vrf –name.
  2. If you want to the set of the interfaces and VRFs then you will have to use the command router# show ip vrf.
  3. If you want to display the routing protocol information for the VRF the command that you will need to use is router # show ip protocols vrf  vrf name.
  4. If you want to ping an ip address that has a specific VRF the command that you will need to use is router # ping vrf ( vrf name ) ip ip address.

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.

Related IT Guides

  1. 200-301 exam dumps
  2. Configure and verify ACLs in a network environment
  3. Configure and verify an ACLs to limit telnet and SSH access to the router
  4. Configure and verify Cisco NetFlow
  5. Configure and verify DHCP (IOS Router)
  6. Configure and verify EtherChannels
  7. Configure and verify initial switch configuration including remote access management
  8. Configure and verify interVLAN routing (Router on a stick)
  9. Configure and Verify IP SLA
  10. Configure and verify IPv4 Network Address Translation (NAT)
  11. Configure And Verify Manual and Autosummarization With Any Routing Protocol
  12. Configure and Verify Network Time Protocol (NTP)
  13. Configure and verify PPP
  14. Configure and verify static routing
  15. Configure and verify VLANs
  16. Describe IP operations
  17. Describe the types, features, and applications of ACLs
  18. Identify and correct common network problems
  19. Recognize proposed changes to the network
  20. Select the appropriate media, cables, ports, and connectors to connect switches to other network devices and hosts
  21. Select the Components Required to Meet a Network Specification
  22. Troubleshoot Layer 2 protocols
  23. Troubleshoot passive interfaces
  24. Verify network status and switch operation using basic utilities
100% Money Back

How to Claim the Refund / Exchange?

In case of failure your money is fully secure by BrainDumps Guarantee Policy. Before claiming the guarantee all downloaded products must be deleted and all copies of BrainDumps Products must be destroyed.

Under What Conditions I can Claim the Guarantee?

Full Refund is valid for any BrainDumps Testing Engine Purchase where user fails the corresponding exam within 30 days from the date of purchase of Exam. Product Exchange is valid for customers who claim guarantee within 90 days from date of purchase. Customer can contact BrainDumps to claim this guarantee and get full refund at Exam failures that occur before the purchasing date are not qualified for claiming guarantee. The refund request should be submitted within 7 days after exam failure.

The money-back-guarantee is not applicable on following cases:

  1. Failure within 7 days after the purchase date. BrainDumps highly recommends the candidates a study time of 7 days to prepare for the exam with BrainDumps study material, any failures cases within 7 days of purchase are rejected because in-sufficient study of BrainDumps materials.
  2. Wrong purchase. BrainDumps will not entertain any claims once the incorrect product is Downloaded and Installed.
  3. Free exam. (No matter failed or wrong choice)
  4. Expired order(s). (Out of 90 days from the purchase date)
  5. Retired exam. (For customers who use our current product to attend the exam which is already retired.)
  6. Audio Exams, Hard Copies and Labs Preparations are not covered by Guarantee and no claim can be made against them.
  7. Products that are given for free.
  8. Different names. (Candidate's name is different from payer's name.)
  9. The refund option is not valid for Bundles and guarantee can thus not be claimed on Bundle purchases.
  10. Guarantee Policy is not applicable to CISSP, EMC, HP, Microsoft, PMI, SAP and SSCP exams as provides only the practice questions for these.
  11. Outdated Exam Products.
Get 10% Discount on Your Purchase When You Sign Up for E-mail

This is a ONE TIME OFFER. You will never see this Again

Instant Discount

Braindumps Testing Engine

10% OFF

Enter Your Email Address to Receive Your 10% OFF Discount Code Plus... Our Exclusive Weekly Deals

A confirmation link will be sent to this email address to verify your login.

* We value your privacy. We will not rent or sell your email address.
Your 10% Discount on Your Purchase

Save 10%. Today on all IT exams. Instant Download

Braindumps Testing Engine

Use the following Discount Code during the checkout and get 10% discount on all your purchases:


Start Shopping