eBGP default 0.0.0.0 redistribution into OSPF

Answered Question
Jun 28th, 2008
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I know about def-info orig [always].

And aware too of stub/t-stubby/nssa rules.


My question is why does ospf deny the redistribution of external 0.0.0.0 into itself?


r1---ebgp---r2---ospf---r3


r2 has a 0.0.0.0 route present in it's rt learned via ebgp (20). r2 then attemtps to redist all bgp routes into ospf. it manages to accomplish this except the default.


Is there any workaround other than those listed at the top of this posting. I want to use the redistribution of bgp learnt 0.0.0.0 into ospf.


tia

Ajaz

Correct Answer by mohammedmahmoud about 8 years 11 months ago

Hi Ajaz,


EIGRP is the only routing protocol that doesn't utilize the default-information originate command , to advertise default information just do the redistribution.


BR,

Mohammed Mahmoud.

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Harold Ritter Sat, 06/28/2008 - 06:41
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Ajaz,


The only way to inject the default route in OSPF is, as you mentioned, through the "default-information originate" command. Redistribution of the default from another source is explicitly prevented by IOS.


Regards,

AJAZ NAWAZ Sat, 06/28/2008 - 09:19
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Cool man. What's the score with eigrp then - same?



Correct Answer
mohammedmahmoud Sat, 06/28/2008 - 09:40
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Hi Ajaz,


EIGRP is the only routing protocol that doesn't utilize the default-information originate command , to advertise default information just do the redistribution.


BR,

Mohammed Mahmoud.

AJAZ NAWAZ Sat, 06/28/2008 - 11:02
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Much appreciated Mohammed.

case closed :-)


asa - ajaz

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