[c-nsp] Converting OSPF backbone to iBGP

[Dan Armstrong]

A quick addition to this thread:

Assuming that your IGP carries is only point to point & loopbacks...

In an "all iBGP" network - what do you do with customer's that are using 
your address space?   Do you redistribute Connected (& static routes) on 
your access routers into iBGP?  I assume that's about all you can do, right?




Mark Tinka wrote:
> On Wednesday 24 September 2008 15:52:13 Garry wrote:
>
>   
>> after years of running very smoothly and without any
>> problems (and not expecting any), we have decided to move
>> our backbone from OSPF (single area) to iBGP as far as
>> "best practice" recommendations go ...
>>     
>
> This is, indeed, a best practice as far as scaling the 
> autonomous system goes.
>
>   
>> I've been trying 
>> to find decent write-ups about certain things, but
>> haven't been too successful as far as certain details go
>> ... maybe somebody has some good pointers for me ...
>>     
>
> Philip Smith (Cisco) has some very good slides on this and 
> other best practice scaling techniques for ISP's that he 
> gives at various workshops and conferences.
>
> You can Google to find a lot of these.
>
>   
>> OK, so baseline recommendation is to only transport
>> loopback/interface IPs in OSPF, do everything else via
>> iBGP ...
>>     
>
> Correct.
>
>   
>> Also, we have CPE devices that speak OSPF to our
>> equipment in order to set up dual uplinks to customer
>> sites ...
>>     
>
> As a friend of mine would say, "I recommend my competitors 
> do that..."
>
> But seriously, running an IGP with your customers isn't a 
> good idea (unless you're doing l3vpn's). I'd recommend 
> running eBGP with your customer's CPE, and keep the 
> OSPF "internal".
>
> Cheers,
>
> Mark.
>   
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>
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