[j-nsp] Migration from IGP to e-BGP

[Christopher Morrow]

(Android mail sucks, sorry)

I think the OP means confederation not 'private islands'.... And they'll have to do some planning to move to confederations.

More importantly, why get rid of your igp? Are you not already doing route reflection and/or ibgp full mesh ?

"Justin M. Streiner" <streiner at cluebyfour.org> wrote:

>On Fri, 28 Dec 2012, tim tiriche wrote:
>
>> We have multi area OSPF and would like to migrate the multi area to
>> private ASN BGP islands.
>
>How are you defining an 'island'?
>
>> Main ASN:1234
>>
>> Problem:
>>
>> In the current OSPF areas there is an e-BGP Peering and Transit with customer.
>> After migration, how can i ensure that customer peer using the Main
>> ASN:1234 and transport it over the core?
>
>"Peering" and "Transit" mean two different things to a number of people 
>who read this mailing list.  I'm guessing you mean one or the other (most 
>likely transit)?
>
>If the customers speak eBGP with you today, and your end of the session is 
>in AS1234, then the customer's traffic will transit AS1234, depending on 
>what you do with the traffic while it's on your network.  If I'm
>understanding your intentions correctly, what do you hope to gain, or what
>problem are you trying to solve by creating 'private ASN BGP islands'?
>
>If the issue is reducing the number of IBGP sessions on your backbone, 
>have a look at route reflectors and BGP confederations.
>
>> How have others done it?
>
>In my past life, we spoke eBGP with our downstream customers.  Either the 
>customers had their own public ASN, or we used another public ASN that we 
>had available at the time.  Private ASNs were used in a few corner cases. 
>The latter two approaches impose limitations that might not be acceptable 
>for some customers.  YMMV.
>
>jms
>
>> Loops, local-as? Would independent domain help?
>>
>> Looking for suggestions.
>>
>> Sincerely,
>> -Tim
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