From: Paglia, John (USPC.PCT.Hopewell) (JPaglia@NA2.US.ML.com)
Date: Mon Oct 14 2002 - 22:00:53 GMT-3
Probably because eBGP routes are accepted by the directly connected eBGP
peer regardless of synchronization-they just wont propogate to that routers
iBGP peers.
It accepted the eBGP over the iBGP routes because iBGP routes have to be
synchronized, and in your case they weren't. You can get around this with
confederations as well.
John
> -----Original Message-----
> From: D. Lee [SMTP:dongweylee1@attbi.com]
> Sent: Monday, October 14, 2002 8:42 PM
> To: Mahmud, Yasser
> Cc: ccielab@groupstudy.com
> Subject: Re: Help with Local Preference
>
> Thank you, and you are right. Why is that??
>
> I knew the internal route from IBGP peer is not synchronized when I
> checked
> it with sho ip bgp x.x.x.x.
>
> ----- Original Message -----
> From: "Mahmud, Yasser" <YMahmud@Solutions.UK.ATT.com>
> To: "'D. Lee'" <dongweylee1@attbi.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Monday, October 14, 2002 3:50 PM
> Subject: RE: Help with Local Preference
>
>
> > It seems as a synchronization problem, use the <no sync> command on R2
> >
> > Yasser Mahmud
> >
> > -----Original Message-----
> > From: D. Lee [mailto:dongweylee1@attbi.com]
> > Sent: Monday, October 14, 2002 10:08 PM
> > To: Cristian Henry H; Paglia, John (USPC.PCT.Hopewell)
> > Cc: 'Peter van Oene'; ccielab@groupstudy.com
> > Subject: Re: Help with Local Preference
> >
> >
> > I do not know what I am missing, but it seems like it always prefers the
> > external route in my lab.
> > (Even though the internal route with a higher local preference)
> >
> > ----- Original Message -----
> > From: "Cristian Henry H" <chenry@reuna.cl>
> > To: "Paglia, John (USPC.PCT.Hopewell)" <JPaglia@NA2.US.ML.com>
> > Cc: "'Peter van Oene'" <pvo@usermail.com>; <ccielab@groupstudy.com>
> > Sent: Monday, October 14, 2002 2:33 PM
> > Subject: Re: Help with Local Preference
> >
> >
> > > Also it is propaged troughout an Confederation!
> > >
> > > "Paglia, John (USPC.PCT.Hopewell)" wrote:
> > > >
> > > > Local pref propogates throughout an AS, so with all things equal it
> > should
> > > > go thru r2.
> > > >
> > > > > -----Original Message-----
> > > > > From: Peter van Oene [SMTP:pvo@usermail.com]
> > > > > Sent: Monday, October 14, 2002 3:55 PM
> > > > > To: Cristian Henry H
> > > > > Cc: ccielab@groupstudy.com
> > > > > Subject: Re: Help with Local Preference
> > > > >
> > > > > Pref should override this.
> > > > >
> > > > > At 04:14 PM 10/14/2002 -0300, Cristian Henry H wrote:
> > > > > >Externals first, then internals
> > > > > >
> > > > > >"D. Lee" wrote:
> > > > > > >
> > > > > > > R1 and R2 are IBGP peers within the same AS, and they are both
> > EBGP
> > > > > peering
> > > > > > > with other AS.
> > > > > > >
> > > > > > > A route-map for local preference was created on R2 for a
> > destination
> > > > > X.
> > > > > > >
> > > > > > > R1 learned a route to X via his EBGP peer, and it was assigned
> a
> > local
> > > > > > > preference 100.
> > > > > > > R2 also learned a route to X via his EBGP peer, and it was
> > assigned a
> > > > > > higher
> > > > > > > local-pref 200
> > > > > > > because of using the route-map. R2 passed the route with
> higher
> > > > > > local-pref to
> > > > > > > R1.
> > > > > > >
> > > > > > > >From the point of view of R1, the best path to X is through
> his
> > EBGP
> > > > > > peer or
> > > > > > > R2??
> > > > > > >
> > > > > > > The router will prefer its external route or its internal
> route
> > with
> > > > > higher
> > > > > > > local preference??
> > > > > > >
> > > > > > > Thanks for all the feedback ...
> > > > > >
> > > > > >--
> > > > > >Cristian E. Henry
> > > > > >REUNA
> > > > > >
> > > > > >E-mail: chenry@reuna.cl
> > > > > >Fono: 56-2-3370336
> > >
> > > --
> > > Cristian E. Henry
> > > REUNA
> > >
> > > E-mail: chenry@reuna.cl
> > > Fono: 56-2-3370336
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