several regarding of ospf

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Jul 3rd, 2010
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Hi team.


I have a several question.


first of all, We have a boundary router what have a two ospf process itself., ospf 1 and ospf 2.

for several security concern, we decide to divide ospf process at HQ, and branch office.


1. when We redistribute from ospf 2 to ospf 1, if ospf 2 has default-route, all network from ospf 2 to ospf 1 but except default-route Right?


2. If we would like to perform that ospf 2 has just only default route toward ospf 1, just only configure 'default-information originate' on boundary router?


3. I would like to know the exact knowledge, the difference of between redi. default-route and default-information originate.


4. On some device, I check that when I redistribute default-route on that, the default-route was advertised to all same ospf process.

    but, on other device, redi. default-route didn't work, So We have to use 'default-information originate',

    Is it related 'IOS' ?


Please let me know ASAP

Thank you.

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Edison Ortiz Sat, 07/03/2010 - 09:09
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1. when We redistribute from ospf 2 to ospf 1, if ospf 2 has default-route, all network from ospf 2 to ospf 1 but except default-route Right?


Correct.


2. If we would like to perform that ospf 2 has just only default route toward ospf 1, just only configure 'default-information originate' on boundary router?


Correct. Caveat, you must have a 0.0.0.0 in the RIB for the default-information originate to work. If you have default-information originate always, then a default route will be provided even if you had no 0.0.0.0 in the RIB.



. I would like to know the exact knowledge, the difference of between redi. default-route and default-information originate.


You can't redistribute the default route in OSPF, the only way is to issue a default-information originate and I explained above, there is a 'always' keyword.


4. On some device, I check that when I redistribute default-route on that, the default-route was advertised to all same ospf process.

    but, on other device, redi. default-route didn't work, So We have to use 'default-information originate',

    Is it related 'IOS'


That's not an expected behavior and I will love to see the config outputs. You can't redistribute the default into OSPF.


Regards,


Edison

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