Cisco CCNP Configuring Multi-Zone and NBMA OSPF
Lab 4-5:Configuring OSPF Virtual Links 【Purpose】:In this lab, youwill detect OSPF virtual links.After completingthis lab, you will need to complete the following tasks:• Connect a zoneto a zone using a virtual link: Note: In thefigure, x is the rack number and y is the router number.:If you have anyquestions, you can ask and ask for help from the tutor at the value.:
(config-route)#area x virtual-link 10.0.0.xy Create a virtual link. This area number must be a transmission area. This IP address is the RID of the peer router.
#show ip ospf Displays information about the router's OSPF process, including all areas connected by all routers.
#show ip ospf neighbor Display the router's OSPF neighbor list and their RIDs
#show ip ospf virtual-links Display the status of the virtual link
#show ip route Display the router's routing forwarding table
: Configure OSPF virtual linkOSPFrequires all zones to have a connection to zone 0 (backbone). In this lab, youwill create a discontinuous region and test the routing table results. You willconfigure a virtual link to connect the new zone to zone 0.experimentprocedure:Step 1:Remove the OSPF stub area configuration on all experimental routers.Step 2:On the internal routers PxR3 and PxR4, close the interface s0 interface anddisconnect the connection between them.Step 3:Place the loopback interface of the internal router to reach a new OSPF area,using the area number x00, where x is your rack number. This requirementrequires you to add a new network statement under the OSPF routingconfiguration.Step 4:Test the routing tables of the border routers PxR1 and PxR2. Is there aloopback interface address network (10.200.200.xy) of the internal router inthe routing table?Step 5:Because OPSF assumes that all zones will have at least one interface connectedto zone 0, this internal router will not advertise the loopback interface tothe border router.However,the area x00 is not the boundary area 0. You can solve this problem byconfiguring a virtual link from area x00 to area 0. The first step inconfiguring a virtual link is to discover the RID of the bilateral router. Youroutput should look similar to the following:Step 6:Configure an OSPF virtual link from the internal router and reach the borderrouter through area x. x is your rack number.Step 7:Verify the working status of the virtual link. Your router output should looksimilar to the following:Step 8:Verify that the border router receives the loopback interface IP address of aDeng internal router.Step 9:On the internal router, use the show ip ospf command. Which OSPF areas areactive on this router.OSPFtreats a virtual link as an interface belonging to area 0. So on the internalrouter, you can see that the three zones are active, area x , area x00 , andarea 0.:Tosuccessfully complete the entire experiment, you need to complete the followingtasks:• You usevirtual links to resolve discontinuous zone failures• Youcreate a random area topology using virtual links.