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  1. Hi Rene,

    thanks a lot for your helpful explanation, I simulated your lab and found something that I need your explanation for it.

    when I leaked 8.8.8.8 at R4, R2 calculated the metric of 8.8.8.8 with 168 as below:

    R2#sh ip route isis 1
          8.0.0.0/32 is subnetted, 1 subnets
    i ia     8.8.8.8 [115/168] via 192.168.24.4, 00:14:47, Ethernet0/2
    

    although R4 calculated it with 30 :

    R4#sh ip route isis
          8.0.0.0/32 is subnetted, 1 subnets
    i L2     8.8.8.8 [115/30] via 192.168.47.7, 00:50:55, Ethernet0/1
    

    the metric calculated with 40 at R2 when I configured the

    ... Continue reading in our forum

  2. Hi Walid,

    That’s a good question. I just booted this topology again and I see a metric of 40 on R2:

    R2#show ip route isis                         
    
    Gateway of last resort is 192.168.24.4 to network 0.0.0.0
    
    i*L1  0.0.0.0/0 [115/10] via 192.168.24.4, 00:14:23, GigabitEthernet0/2
          8.0.0.0/32 is subnetted, 1 subnets
    i ia     8.8.8.8 [115/40] via 192.168.24.4, 00:14:23, GigabitEthernet0/2
    i L1  192.168.13.0/24 [115/20] via 192.168.12.1, 00:15:16, GigabitEthernet0/1
    i L1  192.168.35.0/24 [115/30] via 192.168.12.1, 00:15:10, GigabitEthernet0/1
    i L1  192.168.47.0
    ... Continue reading in our forum

  3. Hi Rene,

    R1#traceroute 8.8.8.8 

    this command result:

    R1 uses R3

    Why do you write:

    R1 uses R2

  4. Hi Rene
    why we will configure on R4 , not on R2 , is there a reason or first level-1-2 router

  5. Hi Bahri,

    Thanks, this is a typo yes. Just fixed it.

    Rene

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