TAILIEUCHUNG - Configuring Virtual Links

At midnight, your pager goes off as you are sleeping in your San Jose home. You are informed that connectivity to Auckland and Singapore has been intermittent for several hours. You log on to the corporate network from home, run some diagnostics, and determine that you can’t get to Auckland. Also, you notice that the Shortest Path First algorithm is being recalculated often on your core routers. The instability seems to be associated with the Asian region of your network. Singapore local time is approximately 4:30 . You call the technical support lead in Singapore to ask if they are experiencing any network connectivity issues. He is. | Configuring Virtual Links Objective In this lab you configure an OSPF virtual link so that a disconnected area can reach the backbone as required by OSPF. Scenario At midnight your pager goes off as you are sleeping in your San Jose home. You are informed that connectivity to Auckland and Singapore has been intermittent for several hours. You log on to the corporate network from home run some diagnostics and determine that you can t get to Auckland. Also you notice that the Shortest Path First algorithm is being recalculated often on your core routers. The instability seems to be associated with the Asian region of your network. Singapore local time is approximately 4 30 . You call the technical support lead in Singapore to ask if they are experiencing any network connectivity issues. He is disappointed that you noticed already but he proudly says that he has added OSPF Area 3 in Auckland so that external routes do not need be redistributed. You agree that it would be best to include Auckland in the OSPF autonomous system but you disagree that another area should be created. A teleconference is set for tomorrow and you go about restoring connectivity and stability. A proper OSPF design has all areas adjacent to Area 0 but Area 3 is disconnected from the backbone. You will configure a virtual link through Area 51 connecting Area 3 to the backbone Area 0. Step 1 Build and configure the network according to the diagram. Also configure multiarea OSPF according to the diagram do not configure the virtual link yet . Configure each router with the loopback address indicated in the diagram. 1 - 3 Semester 5 Advanced Routing - Lab Copyright 2001 Cisco Systems Inc. Use ping to test connectivity between all directly connected interfaces. Each router should be able to ping its serial link partner. Step 2 After you configure the network according to the diagram check Auckland s routing table Auckland show ip route Gateway of last resort is not set .

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