From: libone mhlanga (libone@lycos.com)
Date: Thu Mar 19 2009 - 08:23:42 ART
Oh yeah you can do funky things with route-maps any day .. maybe I should
say give me a scenario where you would NOT want local_pref to be known by
all your iBGP peers ?
<---------[ Received Mail Content ]----------
Subject : Re: Local Preference
Date : Thu, 19 Mar 2009 13:13:31 +0200
From : Ruhann <groupstudy@ru.co.za>
To : libone mhlanga <libone@lycos.com>
Cc : Scott Morris <smorris@internetworkexpert.com>, Andres Alejandro
<andres_ccie@hotmail.com>, ccielab@groupstudy.com
You would do it with a route-map :D
But regarding official documentation, as per most dodgy's, they not
documented, no need to, and probably good reason not too.
But that does not mean it cant be used to do funky things :)
On Thu, Mar 19, 2009 at 12:44 PM, libone mhlanga wrote:
> "It's something either set INBOUND from eBGP peers, or OUTBOUND to iBGP
> peers. "
>
> Halabi's quote is below:-
>
> LOCAL_PREF ( type code 5 )is a well-known discretionary and
> non-transitive attribute - used by a BGP speaker to inform other BGP
> speakers in its own AS of the originating speaker's degree of
preference
> for an advertised route.
>
> So I am not sure how you would set it "OUTBOUND to iBGP peers" ? ie my
> understanding is that you just set it on received routes from your eBGP
> peers and every one of your iBGP peers will accept the value set...end
of
> ! There is no suggestion that you can selectively filter who gets that
> value amongst your iBGP peers...its an AS-wide accepted value once set
> otherwise it would be very messy me thinks :)
>
> ---------[ Received Mail Content ]----------
>
> Subject : RE: Local Preference
>
> Date : Wed, 18 Mar 2009 22:20:42 -0400
>
> From : "Scott Morris"
>
> To : "'Andres Alejandro'" ,
>
>
> It is NOT a transitive attribute on eBGP peers. So you could set it all
> you
>
> want, but it won't do anything towards the outside of your AS!
>
> It's something either set INBOUND from eBGP peers, or OUTBOUND to iBGP
>
> peers. (which one may wonder why you don't change local pref for your
own
>
> router, but want to on other routers in your ASN, but stranger things
> have
>
> happened!)
>
> ;)
>
> HTH,
>
> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
>
> JNCI-M/JNCI-ER
>
> Senior CCIE Instructor
>
> smorris@internetworkexpert.com
>
> Internetwork Expert, Inc.
>
> http://www.InternetworkExpert.com
>
> Toll Free: 877-224-8987
>
> Outside US: 775-826-4344
>
> Knowledge is power.
>
> Power corrupts.
>
> Study hard and be Eeeeviiiil......
>
> -----Original Message-----
>
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>
> Andres Alejandro
>
> Sent: Wednesday, March 18, 2009 3:15 PM
>
> To: ccielab@groupstudy.com
>
> Subject: Local Preference
>
> Hi group,
>
> I have a little doubt, can I apply the local preference inside/outside?
> or
>
> only inside?.
>
> Sample:
>
> 1)
>
> route-map LP
>
> mat community xx
>
> set local preference XX
>
> router bgp XX
>
> neig x.x.x.x route-map LP in
>
> 2)
>
> route-map LP
>
> mat community xx
>
> set local preference XX
>
> router bgp XX
>
> neig x.x.x.x route-map LP out
>
> Please, let me know the opinion.
>
> Thanks
>
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