[c-nsp] ISP Dual AS

[Andrey Petrenko]

i operate network with some AS. one AS we use for transit traffic and connecting to the upstream, all another use for regional branch
--
With best regards,
Andrey 'sshd' Petrenko
xmmp\gtalk: andy.petrenko at gmail.com
skype: andy.petrenko
web: http://sshd.by

On 06.12.2012, at 15:21, Reuben Farrelly <reuben-cisco-nsp at reub.net> wrote:

> On 6/12/2012 10:54 PM, mert ozkul wrote:
>> Hi All,
>> I have query about ISP Design.
>> Why some ISP`s (Ex: BT) using dual AS`es on their network?
>> What are the advantages of using more than one AS in the ISP network?What can be achieved if you use more than one AS?
>> Thanks,Best Regards,
>> -Mert
> 
> I operate a network where we have two AS's.  We inherited the second AS when we took over the second network.
> 
> Why haven't we merged this into one big AS?  Well the two AS's have two completely separate routing policies.  One of those AS's supplies only schools as downstream users, and the upstream connectivity to them is via a specific supplier (a regional educational/research network) whose rules of engagement are that they only supply to education/non corporate clients.
> 
> Our other AS is a bit more relaxed, and there is no such restriction with any suppliers to that network.
> 
> The two AS's peer with each other though so it doesn't cost anything for data to transit between them anyway.
> 
> It does pose some fairly minor complications in terms of training and one-bgp-as-per-IOS but given we have full control over both AS's and all the equipment in them, it means on the other hand that we get to work with some slightly more exciting things like inter-AS MPLS that you don't get to experiment with when it's all one vanilla system ;-)
> 
> Just one reason why an ISP may have more than one AS.
> 
> Reuben
> 
> 
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