Re: How does AS-override work?

Hi,

"remove-private-as" command will check for private AS in your AS-PATH and
remove all.

"as-override" will check if the first AS number in AS-PATH is same as the
neigbor's AS number to which you are advertising and if it matches, it will
replace the AS number with its own As number.

1.1.1.1-------R1---------------R2-------------------R3
   AS100 AS200 AS100

In the above case, you have AS100 partitioned by AS200 (may be ISP) with
as-override. R2 while advertising 1.1.1.1 prefix to R3 will check if the
first AS number in AS-PATH is 100. In this case, yes and it will be replaced
by 200.

HTH,
Nagendra

On 5/28/09, Joe Astorino <jastorino_at_ipexpert.com> wrote:
>
> Basically what it does is replace the AS in prefixes coming in with your
> own
> AS. I believe that is what you want to do here, although you could
> accomplish the same thing with "remove-private-as"
>
>
> Regards,
>
> Joe Astorino
> CCIE #24347 (R&S)
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Jitendra Anbu
> Sent: Friday, May 29, 2009 12:47 AM
> To: ccielab_at_groupstudy.com
> Subject: How does AS-override work?
>
> Hi GS,
>
> Can some explain how AS-override works? If I am trying to strip off a
> private AS from an AP-Path will this command do the trick?
>
> ---------------------------------------------------------
> Regards,
>
> Jit
>
>
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Received on Thu May 28 2009 - 22:22:00 ART