[113869] in North American Network Operators' Group
Re: IPv4 Anycast?
daemon@ATHENA.MIT.EDU (Zhenkai Zhu)
Wed Apr 22 16:02:14 2009
Date: Wed, 22 Apr 2009 13:01:48 -0700
From: Zhenkai Zhu <zhenkai@ucla.edu>
To: Jack Bates <jbates@brightok.net>
In-Reply-To: <49EF151C.5020405@brightok.net>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Jack Bates wrote:
> Zhenkai Zhu wrote:
>> Then there is basically no inter-As anycast besides the anycast
>> prefix for DNS root, since I only noticed like 8 prefixes that are
>> announced by more than 3 ASes..
>>
>
> I presume you are using route-views or some such to get a larger
> picture of the BGP geography?
Yes.
> I believe that many anycasts utilize the same ASN for their anycasted
> address space. I would expect that a few of them have an ASN
> specifically for their anycasted space.
>
> Given that the networks are duplicates, there's no requirement that
> one part of the AS needs to receive routes from the other part of the
> AS. For management and such of the devices, I presume there are
> separate netblocks advertised with a different ASN (possibly even
> statically assigned by a hosting network).
I just want to make sure if I understand correctly. You mean that the
anycasted address space can be announced in different places yet with
the same origin AS?
Zhenkai
>
>
> Jack
>
>
