Solved: eBGP default 0.0.0.0 redistribution into OSPF

AJAZ NAWAZ · ‎06-28-2008

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

mohammedmahmoud · ‎06-28-2008

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.

View solution in original post

Harold Ritter · ‎06-28-2008

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,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

AJAZ NAWAZ · ‎06-28-2008

Cool man. What's the score with eigrp then - same?

mohammedmahmoud · ‎06-28-2008

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 · ‎06-28-2008

Much appreciated Mohammed.

case closed :-)

asa - ajaz