From: Huan Pham (pnhuan@yahoo.com)
Date: Mon Jan 12 2009 - 18:01:24 ARST
No-export of course!
Using no-advertise will prevent prefixes received from AS10 to be advertized to R3 iBGP peers as well which are undesirable here.
Sent from my iPhone
On 13/01/2009, at 6:28 AM, CCIE To Be <ccie.tobe81@gmail.com> wrote:
Dear Group,
I have a confusion regarding usage of no-advertise and no-export
communities. I know that no-advertise means NOT TO ADVERTISE to any bgp peer
( iBGP & eBGP ) whereas no-export says NOT TO ADVERTISE to any eBGP peer
means don't advertise outside this AS. Consider the following topology,
R1(AS 10) --------R2(AS 10)------------R3(AS 30)
Let say AS 10 is advertising a prefix to AS 30 and requirement is that AS 30
should not forward this prefix further to any other AS. Now we have option
to use either no-advertise or no-export on R2 towards R3. Both will give the
desired result , what should be the recommended approach here ??
HTH
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