From: Jongsoo (bstrt2004@gmail.com)
Date: Mon Oct 31 2005 - 16:14:41 GMT-3
Andrew
Basically, I like to find out all the possible MP-BGP topology among PEs
At this moment, I am interested in finding out Hub and spoke topology.
If I use RR at HUB, then I guess it will be a star-toplogy becasue RR will
create eventually full MP-ibgp.
I was talking about more like the below topolgy
Basically, I want all traffics between spokes going through Hub ( I
should've been more clear).
PE1 Spoke1---<mpls>---PE4 HUB---<mpls>---PE2 spoke 2
|
<mpls>
|
PE3 spoke 3
Four PEs have a local VRFA network.
1) three MP-BGP session between HUB and each of three Spokes.
2) Run a igp like Rip or OSPF in VRFA among HUB and Sopkes with
redistribution with BGP and igp.
If Rip, split-horison in HUB should be disabled.
Basically, I am hoping igp in VRFA can achieve full reachability among VRFA.
Of course, I don't know if this wiill work or not yet.
Also, can you think some other way to make a HUb-spoke topology ( maybe
using RR or full-MP-iBGP and manipulating some route-target)
Thanks
Jongsoo
On 10/30/05, Andrew Lissitz (alissitz) <alissitz@cisco.com> wrote:
>
> A hub and spoke would work, as long as the central router reflects the
> routes from each spoke to the others. BGP slit horizon issues will occur if
> the central router is not configured as a RR. If the central router goes
> away ... there goes reachability as well.
> I am not sure what you mean by the IGP question.
> Here is a topology that I think you can run with only a few routers. You
> only need a couple of smart routers (PEs) to make this work. Group, please
> add or take away from this in order to make it better.
> CE---PE1---<mpls>---P1---<mpls>---PE2
> |
> | (Un tagged link)
> RR
> Off of each PE you can hang a CE or create a loopback interface add this
> loopback to a vrf. In either case you will want to have multiple VRFs on
> each PE.
> Keep the link between P1 and RR untagged for part of this and tagged for
> other parts. It makes the show commands more interesting.
> Make the link between CE and PE1 mpls. Use only BGP between the CE and
> PE1 and see if mpls has trouble or not ...
> You can do a lot with a topology like this. Group ... anything to add to
> the topology?
>
> ------------------------------
> *From:* Jongsoo [mailto:bstrt2004@gmail.com]
> *Sent:* Sunday, October 30, 2005 1:10 AM
> *To:* Andrew Lissitz (alissitz); FORUM
> *Subject:* Re: ( SP CCIE) MP BGP among PE's
>
> I think I can also see a way to reduce the number of seesion by making a
> hub-and-spoke topology.
> Then I can reduce MP-ibgp session to 3 ( from one HUB PE to three spoke
> PE), correct?
> Of course, in this case, RIP or OSPF needs in VRFA in order to achieve a
> full reachability between spoke?
> Someone correct me if I am wrong.
> Thanks
> Jongsoo
>
> On 10/29/05, Jongsoo <bstrt2004@gmail.com> wrote:
> >
> > Thanks Andrew and I got it.
> > Basically, it works as a similar way as iBGP
> > The workbook I purchased last wek and am studying now is very poor.
> > But I say ...better than nothing...I am even validating the solution as
> > well
> > Jongsoo
> >
> > On 10/29/05, Andrew Lissitz (alissitz) < alissitz@cisco.com> wrote:
> > >
> > > Good evening Jongsoo,
> > >
> > > Vpnv4 routes need to be propagated to each PE that has this VRFA. On
> > > one of the PEs, you can do a show ip route vrf VRFA and see the
> > > routes.
> > > This routing table needs to be converged, and thus you need the routes
> > > from the other PEs. You will get these routes via mpibgp sessions with
> > > other PEs or RRs.
> > >
> > > It is easier to use RRs and this way you are only creating a session
> > > with the RR, and from the RR to the other PEs ... But of course you
> > > already know this MR CCIE ;-)
> > >
> > > Does this answer your question Jongsoo?
> > >
> > > Andrew
> > >
> > > PS - Have you joined the comserv mail list? I joined both ;-)
> > >
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf
> > > Of
> > > Jongsoo
> > > Sent: Saturday, October 29, 2005 7:53 PM
> > > To: FORUM
> > > Subject: ( SP CCIE) MP BGP among PE's
> > >
> > > Let's say there are one VRF "A" and four PE's and each of PE has one
> > > physical connection belonging to VRF A.
> > > The question is in order to make a full reachability of VRF A networks
> > > among all four PE, the full MP bgp connection by creating 6 MP-BGP
> > > session is a MUST?
> > > Thanks
> > > Jongsoo
> > >
> > > _______________________________________________________________________
> > >
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