2 Replies Latest reply: Apr 1, 2019 12:16 PM by Ri0N RSS

    CCNP - Challenge Lab 7

    Brian

      So i have been using the Cisco CCNP Route Learning Labs and recently completed Challenge Lab #7.  The last part of the Scenario was to reduce the IPv6 routing table and the database in Area 1.  In addition, you are to make sure the traffic to/from Area 1 flows in both directions over the same ABR.

       

      Now if you are familiar with the LAB, the traffic should flow through HQ2 from the backbone area to/from Area 1 as well as Area 2 to Area 1.

       

      My solution was the following:

       

      HQ1

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      exit

      interface Ethernet0/1

      ospfv3 cost 15

       

      HQ2

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      exit

       

      DIST

      =====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub

      exit

      interface Ethernet0/0

      ospfv3 cost 15


      The changes in blue accomplish the task of making sure traffic flows through HQ2.  Changes were made on two different routers.

       

      However, Cisco's "Answer Key" to the Lab was the following:

       

      HQ1

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      area 1 default-cost 2

       

       

      HQ2

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      exit

      interface Ethernet0/1

      ospfv3 cost 8

       

       

      DIST

      =====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub

       

      Again, changes were made to two different routers. So I have a question, if this were the actual CCNP Route Exam, would my answer be marked wrong?  Both solutions accomplish the goal as stated.  Cisco has always recommend that when you make a change to the cost on a link that you make it on both sides of the link for consistency purposes.  If this is still true, then their solution did not do this.  Furthermore, both of these solutions required a change on two different routers.  A better solution would be two changes to a single router.  Like so:

       

      HQ1

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      area 1 default-cost 2

      exit

      interface Ethernet0/1

      ospfv3 cost 15

       

       

      HQ2

      ====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub no-summary

      exit

       

       

      DIST

      =====

      router ospfv3 1

      address-family ipv6 unicast

      area 1 stub

       

      So my concern here is there are three ways to accomplish the task as stated in the Lab, which is the correct one?  Is Cisco grading on the end result! The end result being that traceroutes confirm the traffic going through HQ2.  Or are they looking for key configuration commands to tell if you have completed the task?

       

      I look forward to Cisco's official stance on issues like this regarding exam simulation questions and in particular the CCIE lab exams.

       

      Brian