Re: Correct AS Path

From: Peter Hauck (pahauck@gmail.com)
Date: Fri Sep 26 2008 - 03:54:58 ART

Thanks, I can see you logic.

However in context to a lab though where you can see no prepending - would
the second be correct.

If it did wouldn't the question read "ASY's own and connected AS's"

My experience tells me context is everything, hence my pedantic approach.

Peter

On Fri, Sep 26, 2008 at 4:41 PM, Huan Pham
<Huan.Pham@peopletelecom.com.au>wrote:

> Hi Peter,
>
> - The first one only match route from directly connected customer if
> they do not do any prepending.
> - The second allow route originated internally, routes from directly
> connected customer (allowing to self-prepend of their own AS).
>
> I think the second is better. If you do not want to allow internal
> routes, generated by your AS, then you can do
>
> ^([0-9]+)+$
>
> Cheers,
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Peter Hauck
> Sent: Friday, 26 September 2008 4:23 PM
> To: ccielab@groupstudy.com
> Subject: Correct AS Path
>
> For those who have done this in IE it may be familiar....
>
> Create an AS filter to filter prefixes originated by AS Y's directly
> connected customers. (Assumning you are on the router that is part of
> ASY).
>
> Would this mean ^[0-9]+$ or ^([0-9]+)?$
>
> I am thinking that the first AS-PATH as it matches what is specified, as
> the second also allows routes from the AS itself.
>
> Am I wrong?
> --
> Peter
>
>
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-- 
Peter Hauck

Blogs and organic groups at http://www.ccie.net

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