From: Alex Steer (alex.steer@eison.co.uk)
Date: Thu Aug 02 2007 - 07:05:49 ART
Hyun
Would your address space more than likely get aggregated with all there
other customers / there own addressing?
Is it possible that they would change the origin code at this point?
Cheers
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Hyunseog Ryu
Sent: 29 July 2007 21:29
To: Gregory Gombas
Cc: Herbert Maosa; Group study
Subject: Re: Unique AS number when connecting to two different ISP's?
Upstream providers will remove private AS number when they readvertise
to other ISPs.
So natually if you have multi-homed to multiple ISPs, the route will be
appeared as inconsistent ORIGIN AS, which will not appeared as valid
route from RFC viewpoint.
According to RFC - I don't remember which -, it should be originated
from single AS number.
Also, customer who uses Private ASN with multiple upstream providers can
NOT implement consistent routing policy for that matter.
So multihomed customer with private ASN is not recommended for multiple
providers upstream connection.
If customer have multiple connections with SAME providers, they may use
private ASN for load sharing purpose.
Hyun
Gregory Gombas wrote:
> What are you losing by using a private ASN? You can still advertise
> your own dedicated IP address space via both providers can't you? Your
> ISP's simply needs to remove that private AS when passing the update
> to other ISP's...
>
> Am I missing something here?
>
> On 7/29/07, Herbert Maosa <asawilunda@googlemail.com> wrote:
>
>> If you dont have your own ASN, you will most likely have to use a
private
>> ASN to connect to the two ISPs. Remember that if you use the ISPs ASN
then
>> you are an extension of that ISP. Using the private ASN in this case
will
>> permit you to be totally provider independent.
>>
>> regards,
>>
>> Herbert.
>>
>>
>> On 7/29/07, Gregory Gombas <ggombas@gmail.com> wrote:
>>
>>> When connecting to the internet via two different ISP's, why is it
>>> necessary to have a unique AS?
>>>
>>> What if you simply configured your BGP router with the same AS
number
>>> as one of your ISP's?
>>>
>>> Considering there are only 64511 unique AS numbers, I assume that
most
>>> if not all the AS numbers are already taken. What do companies do in
>>> the case they cannot get their own AS number and need to multihome?
>>>
>>> Thanks,
>>> Greg
>>>
>>>
>>>
>>
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