From: Jason Sinclair (sinclairj@powertel.com.au)
Date: Tue Oct 15 2002 - 20:30:06 GMT-3
Peter,
Couldn't agree more - I am hoping that one of the moves by Cisco after the
changes in the lab later this year will be towards current BGP technology
and use. I had heard via the grapevine that Cisco intends making the no
synch. Command a default config setting in the next round of IOS releases.
Regards,
Jason Sinclair CCIE #9100
Manager, Network Control Centre
POWERTEL
55 Clarence Street,
SYDNEY NSW 2000
AUSTRALIA
office: + 61 2 8264 3820
mobile: + 61 416 105 858
email: sinclairj@powertel.com.au
-----Original Message-----
From: Peter van Oene [mailto:pvo@usermail.com]
Sent: Wednesday, 16 October 2002 08:19
To: ccielab@groupstudy.com
Subject: RE: Help with Local Preference
Than you should ask yourself why you are writing a test that is certifying
your ability to use 10 year old, fully deprecated, useless technology.
At 03:09 PM 10/15/2002 -0700, loizos yiangou wrote:
>What if you are not allowed to disable
>synchronization?
>
>
>--- Peter van Oene <pvo@usermail.com> wrote:
> > You guys _really_ need to turn off sync. You are
> > perpetuating all sorts of
> > nasty uses for otherwise useful BGP tools like
> > confederations ;-) Not to
> > mention making me doubt what I thought I knew.
> >
> >
> > At 09:00 PM 10/14/2002 -0400, Paglia, John
> > (USPC.PCT.Hopewell) wrote:
> > >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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