Re: No-Advertise & No-Expor

From: Narbik Kocharians (narbikk@gmail.com)
Date: Mon Jan 12 2009 - 20:28:11 ARST

Guys,

Local-as can be given to another router in another AS, and it will have the
same effect as the no-export.

On Mon, Jan 12, 2009 at 1:57 PM, Jason Morris <mcnever@gmail.com> wrote:

> for local-as to work you would have to set that community inbound on
> R3. If that's out of your domain that's not really an option. If you
> set the local-as community while its still inside AS10 it wont get
> advertised out.
>
> no-export = AS10 telling AS30 not to tell anyone else
>
> local-as = AS10 not telling AS30 at all
>
> or at least that's my understanding
>
>
>
>
> On Mon, Jan 12, 2009 at 3:27 PM, CCIE To Be <ccie.tobe81@gmail.com> wrote:
> > Got it....
> >
> > Other question is related to local-as community. Let suppose we don't
> want
> > to advertise a specific prefix outside 'AS 10' then we will have again
> same
> > option of no-export. What about using local-as community in this scenario
> > which will not allow a particular prefix to go out of local AS 10 ??
> >
> >
> >
> > On Tue, Jan 13, 2009 at 12:01 AM, Huan Pham <pnhuan@yahoo.com> wrote:
> >
> >> 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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> >>
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> >
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> >
> > _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
> 

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
www.Net-Workbooks.com
Sr. Technical Instructor

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

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