From: Tarun Pahuja (pahujat@gmail.com)
Date: Fri Oct 26 2007 - 15:30:36 ART
Hans,
You would have to write an RFP and get it approved if you
wanted the sequence changed ;-)
Not sure where the confussion is, why would BGP prefer a route from an
external AS when it has one that was generated locally?
BGP does check the origin of the route on a later stage, if you look
at all the steps it goes through to choose the best route.
HTH,
Tarun
On 10/26/07, Hans None <acsyao@hotmail.com> wrote:
> Tarun,
>
> Then can I change the sequence to Weight>locally generated route>Local
> Preference?
>
> Is there any difference?
>
> > Date: Fri, 26 Oct 2007 22:38:58 +0530
> > From: pahujat@gmail.com
> > To: acsyao@hotmail.com
> > Subject: Re: BGP route selection sequence-contradiction!
> > CC: ccie.xpert@gmail.com; koen@koenzeilstra.com; ccielab@groupstudy.com
>
> >
> > ACS,
> > Weight is a Cisco-proprietary BGP attribute.The weight
> > attribute is significant only to the router on which it is changed. If
> > you set a higher weight for a particular route in order to give it
> > preference (a higher weight is preferred over a lower one), that
> > weight is not advertised to other routers.
> >
> > HTH,
> > Tarun
> >
> > On 10/26/07, Hans None <acsyao@hotmail.com> wrote:
> > > All,
> > >
> > > I have a question on BGP route selection sequence.
> > >
> > > According to Cisco, the rule is:
> > >
> > > Weight>Local Preference>locally generated route
> > >
> > > However, all the locally generated routes will have higher weight of
> 32768,
> > > then they will take precedence over Local Preference. Is this a
> > > contradiction?
> > >
> > > Shall the order be Weight>locally generated route>Local Preference?
> > >
> > > Need an explanation on this.
> > >
> > > Thanks in advance.
> > >
> > > -ACS
> > >
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