Re: Maximum-path ibgp

:) everyting fine got it THANKS
 but where did I belive come from in last post :) kidding

On Wed, Mar 31, 2010 at 11:23 PM, Muzammil Mukhtar <
muzammil_mukhtar_at_hotmail.com> wrote:

> I believe that's right in case of normal BGP.
>
>
> ------------------------------
> Date: Wed, 31 Mar 2010 23:22:14 +0530
>
> Subject: Re: Maximum-path ibgp
> From: jckdaniels12_at_gmail.com
> To: muzammil_mukhtar_at_hotmail.com
> CC: naman.prep_at_gmail.com; ccielab_at_groupstudy.com
>
> if it was BGP IPV4 then will it have imported routes from all 4 RR for same
> prefix by default ?
>
> On Wed, Mar 31, 2010 at 11:15 PM, Muzammil Mukhtar <
> muzammil_mukhtar_at_hotmail.com> wrote:
>
> > so import has to be configured under VPNV4 session of bgp <<<<<< this
> will
> > bring update from diff RR in BGP table only and not in RIB.....
> >
> That's right
>
>
> > But otherwise also all updates from all BGP peers (RR) should be their in
> > BGP table as per ibgp behaviour.....route learnt frrom RR server is
> > installed in BGP table >>>>>>>
>
> It doesn't work this way in in MP-BGP situation, routes get imported from
> RR that has the lower loopback id, PE will not import the routes from all RR
> for same prefix pointing to same next-hop.
>
> ...Muhammad
>
> > Date: Wed, 31 Mar 2010 22:54:48 +0530
>
> > Subject: Re: Maximum-path ibgp
> > From: jckdaniels12_at_gmail.com
> > To: muzammil_mukhtar_at_hotmail.com
> > CC: naman.prep_at_gmail.com; ccielab_at_groupstudy.com
> >
> > so import has to be configured under VPNV4 session of bgp <<<<<< this
> will
> > bring update from diff RR in BGP table only and not in RIB.....
> >
> > But otherwise also all updates from all BGP peers (RR) should be their in
> > BGP table as per ibgp behaviour.....route learnt frrom RR server is
> > installed in BGP table >>>>>>>is their any clause of cluster-id in this
> case
> > for RR???
> >
> > On Wed, Mar 31, 2010 at 10:48 PM, Muzammil Mukhtar <
> > muzammil_mukhtar_at_hotmail.com> wrote:
> >
> > > You got it, except, route update will not be in BGP table. BGP table
> will
> > > show the import from only one RR, if you do the "import command" than
> it
> > > will install all of them in BGP table.
> > >
> > > From BGP to RIB, it is a different selection mechanism based on BGP
> > > attirbutes and whether you've iBGP multipath, ibgp unequal cost..etc.
> > >
> > >
> > >
> > > ------------------------------
> > > Date: Wed, 31 Mar 2010 22:45:23 +0530
> > >
> > > Subject: Re: Maximum-path ibgp
> > > From: jckdaniels12_at_gmail.com
> > > To: muzammil_mukhtar_at_hotmail.com
> > > CC: naman.prep_at_gmail.com; ccielab_at_groupstudy.com
> > >
> > > so you mean if I have topology with PE1 advertising 1.1.1.0/24
> > >
> > > PE1 is peering with 4 RR (VPNV4).....Route update will be their in BGP
> > > table from all RR ( 4 RR's).....but I'll install only one ...
> > >
> > > If I use import comand it will insall all updates from 4 RR in routing
> > > table <<<<<
> > >
> > >
> > >
> > >
> > > On Wed, Mar 31, 2010 at 10:26 PM, Muzammil Mukhtar <
> > > muzammil_mukhtar_at_hotmail.com> wrote:
> > >
> > > What tends to happen is let's say you've 4 RR and your P,PE routers
> imports
> > > routes from them but only one RR gets elected out of the 4 RR but if
> you
> > > want to import routes from all of these RR than you choose the command
> > > Import.
> > >
> > > > Date: Wed, 31 Mar 2010 21:01:34 +0530
> > >
> > > > Subject: Re: Maximum-path ibgp
> > > > From: jckdaniels12_at_gmail.com
> > > > To: muzammil_mukhtar_at_hotmail.com
> > > > CC: naman.prep_at_gmail.com; ccielab_at_groupstudy.com
> > > >
> > > > requisest you to please explain in detail you were talking about RR
> > > >
> > > > On Wed, Mar 31, 2010 at 8:27 PM, Muzammil Mukhtar <
> > > > muzammil_mukhtar_at_hotmail.com> wrote:
> > > >
> > > > > It will, that's the default behaviour of maximum-path, whatever
> routes
> > > > > marked as mutlipath in the BGP table will be insterted into the
> routing
> > > > > table.
> > > > >
> > > > >
> > > > > > Date: Wed, 31 Mar 2010 20:11:21 +0530
> > > > > > Subject: Re: Maximum-path ibgp
> > > > > > From: jckdaniels12_at_gmail.com
> > > > > > To: muzammil_mukhtar_at_hotmail.com
> > > > > > CC: naman.prep_at_gmail.com; ccielab_at_groupstudy.com
> > > > >
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > but if maximum path is configured and next hop are 2 diffrent PE
> , so
> > > > > wont
> > > > > > it install both next hops in routing table if MXIMUM-path ibgp is
> > > > > > configured.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > On Wed, Mar 31, 2010 at 7:29 PM, Muzammil Mukhtar <
> > > > > > muzammil_mukhtar_at_hotmail.com> wrote:
> > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > The main purpose of this to improve the convergence time if
> you've
> > > > > multiple
> > > > > > > route reflectors and the next hop is the same.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > For your setup, it may not make a difference as you are only
> > > learning
> > > > > the
> > > > > > > prefix from two PEs, this feature is usually used where you've
> > > multiple
> > > > > > > Route-reflectors where route is only imported from the RR with
> the
> > > > > lower
> > > > > > > loopback.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ...Muhammad
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > Date: Wed, 31 Mar 2010 00:14:49 -0700
> > > > > > > > Subject: Maximum-path ibgp
> > > > > > > > From: naman.prep_at_gmail.com
> > > > > > > > To: ccielab_at_groupstudy.com
> > > > > > > >
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > I need to understand the difference between normal
> maximum-path
> > > ibgp
> > > > > and
> > > > > > > > maximum-path ibgp import. Now suppose if a PE is getting a
> same
> > > route
> > > > > > > from
> > > > > > > 2
> > > > > > > > different PE via a ibgp VPNv4 session.
> > > > > > > >
> > > > > > > > So if maximum-path ibgp is configured in that address-family
> it
> > > will
> > > > > put
> > > > > > > 2
> > > > > > > > routes in the VRF routing table. So what difference will it
> make
> > > if i
> > > > > > > > configure import keyword along with this command.
> > > > > > > >
> > > > > > > > thanks
> > > > > > > >
> > > > > > > >
> > > > > > > > Blogs and organic groups at http://www.ccie.net
> > > > > > > >
> > > > > > > >
> > > > >
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Received on Wed Mar 31 2010 - 23:29:36 ART