[104651] in North American Network Operators' Group
Re: Splitting ARIN assignment
daemon@ATHENA.MIT.EDU (Yamasaki, Charles)
Thu May 22 14:32:34 2008
Date: Thu, 22 May 2008 11:30:42 -0700
From: "Yamasaki, Charles" <Charles.Yamasaki@move.com>
To: Hyunseog Ryu <r.hyunseog@ieee.org>,
James Kelty <jkelty@pandora.com>
In-Reply-To: <4835B14B.9000901@ieee.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> Make sure that your two location is inter-connected directly,
Why is this required? If you put static routes to point the remote /21 to
the upstream provider on each side wouldn't that take care of the origin AS
loop?
On 5/22/08 10:45 AM, "Hyunseog Ryu" <r.hyunseog@ieee.org> wrote:
> I I were you, I will advertise as following.
>
> /21 Original ARIN allocation
> /22 First half of ARIN allocation
> /22 second half of ARIN allocation
>
> In this case, you will have backup /21 route just in case of filtering
> or something like that.
> But in normal case, traffic will be routed based on more specific
> routes, which are /22s.
>
> In some case, upstream ISPs may filter based on strict filtering, which
> means all BGP prefix announcement should be matched with registered CIDR
> info including subnet size.
> In most case, upstream ISP will accept any subnet size between
> registered size (/21) and /24 size.
>
> Because of load sharing and traffic engineering requirement, it is easy
> to handle those situation with /22 size.
>
> Make sure that your two location is inter-connected directly, and have
> enough capacity when each of location upstream connection goes down.
>
>
> Hyun
>
>
> ames Kelty wrote:
>> Hey all,
>>
>> I'm looking for an opinion from the group. I have an ARIN /21
>> assignment and a new requirement for a second data center. Rather than
>> ask for another assignment, I would like to advertise one /22 from one
>> location and the other /22 from the second location both with the same
>> asn. My apps will work that way, so I don't have an issue internally,
>> but I'm looking for a broader base opinion on that.
>>
>> Thanks a lot!
>>
>> -James
>>
>>
>>
>>
>
>
Charles Yamasaki
Manager Network Engineering
Move Inc.
30700 Russell Ranch Rd
Westlake Village, CA 91362
O: 805.557.3829
M: 805.603.6492
F: 805.557.3870
