[c-nsp] what's the right way to redistribute certain bgp prefixedinto ospf?

[Chris Woodfield]

Here there be dragons...

As others have said, this is a *very* dangerous thing to do and  
should only be done if you have exhausted all other means of  
achieving your goal. You don't want to accidentally redistribute a  
full table into your IGP (which will be the result should you  
accidentally delete the match statement in your route map).

If you must do it, be very careful (if nothing else, make sure your  
prefix-list ends with a explicit deny in it to prevent extra permits  
from being added accidentally) and make sure your IOS has the max- 
prefix option enabled.

-C

On Dec 6, 2006, at 5:43 AM, matthew zeier wrote:

>
>
> Oliver Boehmer (oboehmer) wrote:
>>> I have one or two BGP prefixes I need to get into my IGP - what's  
>>> the
>>> right way to get a specific BGP prefix into OSPF?
>>
>> redistribute bgp <foo> route-map <bar>
>>
>> route-map <bar> permit 10
>>  match ip address ...
>
> So to clarify, something like the following?
>
> ip prefix-list ams-routes permit 163.245.212.0/22
>
> route-map ams-prefix permit 10
>   match ip address prefix-list ams-routes
>
> router ospf 1
>   redistribute bgp 65001 route-map ams-prefix subnets
>   redistribute maximum-prefix 200 80
>
>
> (Basically I have one site announcing the supernet /20 and another  
> site with a
> different ASN announcing the /22.  My BGP speaking routers have no  
> problem
> with it but my OSPF-only routers are only seeing the nailed up / 
> 20.  So I need
> some way to get the remote /22 into the IGP here.)
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