CCNP BSCI(642-901) Lab – IPv6 OSPF Virtual Link

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Acme is a small export company that has an existing enterprise network that is runing IPV6 OSPFv3. Currently is configured on all routers.However, P4S-R4′s loopback address (FEC0:4:4) cannot be seen in P4S-R1′s routin table.You are tasked with identifying the cause of this fault and implementing the needed corrective actions that uses features and does no change the current area assignments. You will know that you have corrected the fault when P4S-R4′s loopback address (FEC0:4:4) can ping from P4S-R1 to P4S-R4 loopback address.

Special Note: To gain the maximum number of points you must remove all incorrect or unneeded configuration statements related to this issue.

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Special Note: To gain the maximum number of points you must remove all incorrect or unneeded configuration statements related to this issue.

Answer and Explanation:

To troubleshoot the problem, first issue the show running-config on all of 4 routers. Pay more attention to the outputs of routers P4S-R2 and P4S-R3

The output of the “show running-config” command of P4S-R2:

OSPFIPv6v3VirtualLink_show_run_R2

The output of the “show running-config” command of P4S-R3:

OSPFIPv6v3VirtualLink_show_run_R3

We knew that all areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible,we can use a virtual link to connect to the backbone through a non-backbone area. The area through which you configure the virtual link is known as a transit area. In this case, the area 11 will become the transit area. Therefore, routers P4S-R2 and P4S-R3 must be configured with the area <area id> virtual-link <neighbor router-id> command.

+ Configure virtual link on P4S-R2 (from the first output above, we learned that the OSPF process ID of P4S-R2 is 1):

P4S-R2>enable
P4S-R2#configure terminal
P4S-R2(config)#ipv6 router ospf 1
P4S-R2(config-rtr)#area 11 virtual-link 3.3.3.3

Save the configuration:

P4S-R2(config-rtr)#end
P4S-R2#copy running-config startup-config

(Notice that we have to use neighbor router-id 3.3.3.3, not P4S-R2′s router-id 2.2.2.2)

+ Configure virtual link on P4S-R3 (from the second output above, we learned that the OSPF process ID of P4S-R3 is 1 and we have to disable the wrong configuration of “area 54 virtual-link 4.4.4.4″):

P4S-R3>enable
P4S-R3#configure terminal
P4S-R3(config)#ipv6 router ospf 1
P4S-R3(config-rtr)#no area 54 virtual-link 4.4.4.4
P4S-R3(config-rtr)#area 11 virtual-link 2.2.2.2

Save the configuration:

P4S-R3(config-rtr)#end
P4S-R3#copy running-config startup-config

You should check the configuration of P4S-R4, too. If it has the command of “area … virtual link …” then remove it.

After finishing the configuration don’t forget to ping between P4S-R1 and P4S-R4 to make sure they work well!

That is all, hope to helpful for you. Best Luck for ur BSCI Exam.

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