From: Aamer Kaleem (kaleemaamer@yahoo.com)
Date: Mon Nov 18 2002 - 04:37:15 GMT-3
my two cents are :
try backdoor thing...
Aamer
--- Brian McGahan <brian@cyscoexpert.com> wrote:
> David,
>
> Administrative distance doesn't have anything to do
> with the BGP
> best path selection process. The BGP best path
> selection determines
> which prefix will be candidate to be installed in
> the IP routing table,
> and will be propagated to other BGP neighbors.
> Administrative distance
> determines which prefix is actually installed in the
> routing table if
> you have multiple longest matches from multiple
> protocols.
>
> The reason your router is not picking the iBGP
> learned prefix
> over the EBGP learned prefix is most likely
> synchronization. Your iBGP
> learned paths are not synchronized, and the
> synchronization rule does
> not apply to EBGP neighbors. Next-hop reachability
> could also be the
> issue, but I'm assuming you already have this due to
> IGP. Turn
> synchronization off and see what happens.
>
> AFAIK, there is no way to change the EBGP over iBGP
> selection
> other than changing that actual peering session.
> For more information
> on the selection process:
>
>
http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a
> 0080094431.shtml
>
> On a side note, Jennifer, distance can be changed
> using the
> routing process command 'distance'. For more info
> on the distance
> command:
>
>
http://www.groupstudy.com/archives/ccielab/200208/msg00909.html
>
>
> HTH
>
> Brian McGahan, CCIE #8593
> Director of Design and Implementation
> brian@cyscoexpert.com
>
> CyscoExpert Corporation
> Internetwork Consulting & Training
> Voice: 847.674.3392
> Fax: 847.674.2625
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Jennifer Bellucci
> > Sent: Sunday, November 17, 2002 6:58 PM
> > To: Giveortake@aol.com; ccielab@groupstudy.com
> > Subject: Re: BGP path selection
> >
> > I read somewhere that it is now possible to change
> the AD for a given
> > route
> > by using route-maps or some other filtering tech
> >
> > Someone correct me
> > ----- Original Message -----
> > From: <Giveortake@aol.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Monday, November 18, 2002 12:23 AM
> > Subject: BGP path selection
> >
> >
> > > I am trying to make my router select a path from
> an IBGP peer over
> the
> > same
> > > path from an EBGP peer. In my demo scenerio,
> I can not use "no
> synch"
> > I
> > > have tried adjusting the meds, local pref, and
> weights, but
> apparently
> > the
> > > Admin distance of 20 will always take
> precidence. Any suggestions?
> > Please
> > > only answer if certain!
> > >
> > > output from router is as follows
> > >
> > > 200.0.0.2/32 150.50.17.2 0
> 0 100 ?
> > > * i 150.50.78.7 75
> 100 0 100 ?
> > > *> 200.0.0.4/32 150.50.17.2 65
> 0 100 ?
> > > * i 150.50.78.7 139
> 100 0 100 ?
> > > *> 200.0.0.5/32 150.50.17.2 65
> 0 100 ?
> > > * i 150.50.78.7 11
> 100 200 100 ?
> > > *> 200.0.0.6/32 150.50.17.2 65
> 0 100 ?
> > > * i 150.50.78.7 11
> 100 0 100 ?
> > > *> 200.0.0.7/32 150.50.17.2 75
> 0 100 ?
> > > * i 150.50.78.7 0
> 100 200 100 ?
> > >
> > > Thank You,
> > >
> > > David
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