about transit AS

From: caolw (caolw@xxxxxxxxxxxx)
Date: Mon Apr 30 2001 - 04:25:37 GMT-3

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Hi,All:

I have a question about BGP.

(AS254)---r1-(AS1)-r2-(AS1)-r3--(AS254)

1. r1,r2,r3 are in AS1,
2. r1,r3 are border router.r2 is RR.
peer is AS254
3. the request is:donot let AS1 become a transit AS
4. Donot use as-path filter.

My answer is use Commumity attri.
I let r1 and r3's incoming routes set no-export.
and send-community to r2.
r2 send-community to r1 r3.

But I know my answer is wrong.

Is anyone have any other solutions?
Thanks.
**Please read:http://www.groupstudy.com/list/posting.html

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