On Sep 22, 2010, at 9:25 AM, Heath Jones wrote:
> Hi all,
>
> Probably a silly question, but can anyone explain to me this: 3561
> 3356 9031 {35821,35821,35821,35821} i
Isn't this just AS prepending ?
http://home.ie.cuhk.edu.hk/~dmchiu/tnsm.pdf
(You can easily find info on this for your router of choice with any search
engine.)
>
> To explain it a bit better, I'm looking at real routing information
> from routeviews (#3).
>
> According to RFC 4271 (9.2.2.2 Aggregating Routing Information):
>> For the purpose of aggregating AS_PATH attributes, we model
>> each AS within the AS_PATH attribute as a tuple <type, value>,
>> where "type" identifies a type of the path segment the AS
>> belongs to (e.g., AS_SEQUENCE, AS_SET), and "value" identifies
>> the AS number.
>> ...
>> No tuple of type AS_SET with the same value SHALL appear
>> more than once in the aggregated AS_PATH.
>
> Am I misreading things, or is this path information out of spec?
>
>
> ps. Is this the best list to post to for this type of thing, or can
> someone recommend a better one?
I would try NANOG.
Regards
Marshall
> Cheers
> Heath
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