[c-nsp] BGP to OSPF redistribution

[Harold 'Buz' Dale]

Can you stop learning routes from 'provider b' and add it back as a default?  Then everything should go to the more specific route and if 'provider a' goes down things will then go through 'provider b'?

Luck,
Buz

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Saxon Jones
Sent: Wednesday, January 13, 2010 3:39 PM
To: null zeroroute
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] BGP to OSPF redistribution

Actually I re-read your problem. Sham links may be a solution to look at, if
you control the right pieces of equipment. You can also mess with the AD of
OSPF external routes versus OSPF internal routes but this is probably a Bad
Idea(TM) (and my testing of this a few years ago showed it didn't have the
desired result).

______________________________
Saxon Jones

Email: saxon.jones at gmail.com
Telephone: (780) 669-0899
Toll-free: (866) 701-8022
United Kingdom: 0(1315)168664



2010/1/13 Saxon Jones <saxon.jones at gmail.com>

> If I understand your question properly, why not just change the
> administrative distance of the eBGP routes to something less than 110.
> ______________________________
> Saxon Jones
>
> Email: saxon.jones at gmail.com
>
>
> 2010/1/13 null zeroroute <nullzero.route at gmail.com>
>
>> I'm having a problem trying to figure out a way to get eBGP learned routes
>> (from a layer-3 VPN MPLS WAN provider) into our internal OSPF, so that the
>> routes learned via the provider are preffered over the internally learned
>> OSPF routes.
>>
>> No matter where the BGP-->OSPF redistribution point is, if it's the PE or
>> CE, the routes will still show up (by default) as OSPF external, and will
>> never be prefferred.
>>
>> The provider who's path we prefer will only run BGP.  We would like to use
>> OSPF everywhere if possible, for several reasons.
>>
>> WAN provider A is a layer-3 VPN MPLS network, and is the prefferred path.
>> WAN provider B is a layer-2 VPN MPLS network over which we run OSPF.
>> Provider B's network is inferior at times and we use it as a backup.
>>
>> The equipment where the eBGP peering relationsips exist is a mix of 7600,
>> 3800, 2800, 1800, 6500, 3750, 3550.
>>
>> We considered GRE over the providers network however we then wind up with
>> 25+ tunnels at each location, and that just grows as each new site is
>> added,
>> not to mention some potential issues regarding throughput with a GRE
>> tunnel
>> in the path.
>>
>> Is there a way to redistribute BGP into OSPF so that the routes can be
>> anything but OSPF external?
>>
>> I have not found a way to do this yet, and was wondering if it's even
>> possible, or if I'm missing something obvious.  Any suggestions
>> appreciated.
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>
>
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