CCIE workbook v3.0 - Full scale lab 1 task 4.2

Hi there,

I just realised something on the full scale lab 1 task 4.2 verification:

From the answer provided from the workbook:

R7#show ip route ospf
O E2 192.168.210.0/24 [110/1] via 192.168.79.9, 00:00:01, FastEthernet0/0
O E2 192.168.78.0/24 [110/3] via 192.168.79.9, 00:00:24, FastEthernet0/0
O E2 192.168.108.0/24 [110/2] via 192.168.79.9, 00:00:24, FastEthernet0/0
O 192.168.199.0/24 [110/2] via 192.168.79.9, 00:00:24, FastEthernet0/0
8.0.0.0/32 is subnetted, 1 subnets
O E2 8.8.8.8 [110/3] via 192.168.79.9, 00:00:24, FastEthernet0/0
192.168.0.0/32 is subnetted, 2 subnets
O 192.168.0.9 [110/2] via 192.168.79.9, 00:00:24, FastEthernet0/0
O E2 192.168.0.10 [110/2] via 192.168.79.9, 00:00:24, FastEthernet0/0

Note: It was OSPF E2 routes.

 

In fact, from my lab, the answer should O IA routes:

R7#sh ip route ospf
Gateway of last resort is not set

      8.0.0.0/32 is subnetted, 1 subnets
O IA     8.8.8.8 [110/5] via 192.168.79.9, 00:04:55, FastEthernet0/0
      192.168.0.0/32 is subnetted, 2 subnets
O        192.168.0.9 [110/2] via 192.168.79.9, 00:11:19, FastEthernet0/0
O IA     192.168.0.10 [110/4] via 192.168.79.9, 00:04:55, FastEthernet0/0
O IA  192.168.78.0/24 [110/5] via 192.168.79.9, 00:04:55, FastEthernet0/0
O IA  192.168.108.0/24 [110/4] via 192.168.79.9, 00:04:55, FastEthernet0/0
O     192.168.199.0/24 [110/2] via 192.168.79.9, 00:11:19, FastEthernet0/0
O IA  192.168.210.0/24 [110/3] via 192.168.79.9, 00:04:55, FastEthernet0/0

 

I believe the redistributed routes between OSPF and MBGP should be regarded as O IA routes on R7. Can you please confirm?

 

Regards,

Chris Lau

 

 

 

Comments

  •  

    You'll only get IA routes if you manually set the OSPF domain-ID on XR1 as it doesn't encode it from the process ID by default like regular IOS, 

    Off the top of my head - when you configure the later task and bring up OSPF between R1 and XR2 you'll have IA routes vs O routes with O being preferred, the later task of configuring a sham-link  would make everything 'O' in which case you rely on metrics to break the tie. 

    So whilst your answer is right, I think INE are also right - as for that particular task it's not saying you need IA or E2 routes, as the later sections deal with path selection.

  • Hi TimG,

    Thanks for your prompt reply. Yes, what I did was manually configured the domain ID on XR to make it matched at both ends. Therefore, the PE will be determined as OSPF ABR that originated type-3 routes.

    Ok, i agreed with you

     

    Regards,

    Chris Lau

     

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