Re: How does AS-override work?

+) Scenario without As-override :

R1 (As 64512 )<<<------>>>> R2 (As 64513)<<<<<-------- >>>>>>R3 (As 64514)

10.10.10.0/24 i 10.10.10.0/24 64512 i
10.10.10.0/24 64513 64512 i

+) Scenario with As-override configured @ R2

R1 (As 64512 )<<<------>>>> R2 (As 64513)<<<<<-------- >>>>>>R3 (As 64514)

10.10.10.0/24 i 10.10.10.0/24 64512 i
10.10.10.0/24 64513 64513 i

+) when AS Override is used, AS 64512 in the AS-PATH is replaced with
the AS number of the sending BGP router R2 ,which is 64513.
+) Any other occurrences (further down the AS-PATH) of the receiving
router's AS number are not replaced because they indicate a real
routing information loop.

Corrected Version : Hope it will work .

Rsharma

On 5/29/09, Rsharma <cciers09_at_gmail.com> wrote:
> Hope this will help you ......
>
>
>
> +) Scenario without As-override :
>
> R1 (As 64512 ) <<<<<------>>>>>> R2 (As 64513)ASoverride
> <<<<<<-------- >>>>>>R3 (As 64514)
>
> 192.168.10.0/24 i 192.168.10.0/24 64512 i
> 192.168.10.0/24 64513 64512 i
>
>
> +) Scenario with As-override configured @ R2
>
> R1 (As 64512 ) <<<<<------>>>>>> R2 (As 64513)ASoverride
> <<<<<<-------- >>>>>>R3 (As 64514)
>
> 192.168.10.0/24 i 192.168.10.0/24 64512 i
> 192.168.10.0/24 64513 i
>
>
>
>
>
>
> +) when AS Override is used, AS 64512 in the AS-PATH is replaced with
> the AS number of the sending BGP router R2 ,which is 64513.
>
> +) Any other occurrences (further down the AS-PATH) of the receiving
> router's AS number are not replaced because they indicate a real
> routing information loop.
>
>
> Rsharma
>
>
>
>
> On 5/29/09, Jitendra Anbu <Jitendra.Anbu_at_optus.com.au> wrote:
>> 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
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Fri May 29 2009 - 10:48:03 ART