Re: Maximum-path ibgp

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
> > > > > >
> > > > > >
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Received on Wed Mar 31 2010 - 22:54:48 ART