Re: OSPF redistribution into eBGP

FTR, I've just tested this on dynamips with a 7200 running 15.1 and
still does filter the default by default.

I've seen comments citing that this is not the case here:

        http://blog.ioshints.info/2007/11/bgp-default-route.html

so I guess some architectures or images do it in a different way.

-Carlos

Carlos G Mendioroz @ 25/01/2011 08:40 -0300 dixit:
> Try with a network 0.0.0.0 inside bgp @R2.
> That should make BGP happy.
>
> Dynamips it's ok, it is a hardware emulator so the code behaves fine
> as long as you don't get into timing issues or interface singularities :)
>
> -Carlos
>
> Usha Rani @ 25/01/2011 07:32 -0300 dixit:
>> 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?*
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>> --
>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>
>>
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>>
>>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net