RE: OSPF redistribution into eBGP

Just did it up in GNS3 as well..

You need to include the 'network 0.0.0.0' command under the BGP
configuration on R1 to advertise the default over to R3.

Give that a shot.

Cheers,

Aaron.

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Usha
Rani
Sent: Tuesday, 25 January 2011 6:32 PM
To: Carlos G Mendioroz
Cc: Cisco certification
Subject: Re: OSPF redistribution into eBGP

R1(config-router)#do show version | i IOS
Cisco IOS Software, 3600 Software (C3640-IK9O3S-M), Version 12.4(23),
RELEASE SOFTWARE (fc1)
R1(config-router)#

 i'm trying in Dynamips..

On Tue, Jan 25, 2011 at 3:59 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> What version of IOS are you running @ R1 ?
> It used to be the case that the default route was filtered by default.
> You would need a network statement (BGP) to enable it, or a neighbor
> default-originate to clamp it.
> Default route can be tricky at times. Most protocols have special
> treatment one way or the other, for a reason.
> -Carlos
>
> Usha Rani @ 25/01/2011 04:49 -0300 dixit:
>
>> Hi,
>> I have a question on OSPF redistribution into BGP.
>>
>>
>> R2----ospf----R1---BGP-----R3
>>
>>
>>
>>
>>
>> 1. Configured OSPF between R1 and R2
>>
>> 2. Advertised R2 s loopback in OSPF also R2 is advertising
>> default-route always.
>>
>> 3. Configured eBGP between R1 and R3
>>
>> 4. In R1, Redistributed ospf routes into BGP (redistribute ospf 1
>> match internal external 1 external 2)
>>
>> 5. In R3, its observed that all the OSPF routes have been
>> redistributed into BGP, except the default-route.
>>
>>
>>
>> P.S: If I configure EIGRP between R1 and R3 and redistribute OSPF into
>> EIGRP, even the default-route is getting redistributed into EIGRP.
>>
>>
>>
>> *Is this the expected behavior?*
>>
>>
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>>
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>>
>>
>>
>>
>>
>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Tue Jan 25 2011 - 19:36:05 ART