From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Nov 28 2007 - 10:52:29 ART
Few things to remember:
Rip keeps the next-hop information by default, This can not be disabled
The next-hop preservation in EIGRP is not a default, It is turned on with
the interface command "no ip next-hop-self eigrp <as>"
The Next hop preservation in BGP is a default, It can be disabled with the
BGP command "neighbor <n> next-hop-self"
In OSPF next-hop preservation happens naturally except in
point-to-multipoint mode.
HTH,
Tarun
On Nov 28, 2007 6:28 AM, ccie ccie <cciefun@gmail.com> wrote:
> Thanks Gops. Perfect explanation.
>
> Reagards
> Mike
>
>
> On 11/28/07, Gupta, Gopal (NWCC) <gopal.gupta@hp.com> wrote:
> >
> >
> > One more point to add here is that OSPF too would have done the same
> > behavior as RIP if not configured with the Point-to-Multipoint option.
> >
> > HTH
> > Gops
> >
> > -----Original Message-----
> > From: Gupta, Gopal (NWCC)
> > Sent: Wednesday, November 28, 2007 16:16
> > To: 'ccie ccie'; Vaibhav Sharma
> > Cc: Cisco certification
> > Subject: RE: RIP over FR (hub&spoke) not working properly..
> >
> > Hi Mike,
> >
> > There is a basic deifference between RIP and OSPF P-2-M
> >
> > When Configured OSPF P-2-M we don't need to map spoke to spoke because
> > spoke communicates with other spoke via L-3 Route which in this case
> > would point to nextHOP of HUB and not the SPOKE.
> >
> > Where as in RIP we learn the Route which directly points to the next hop
> > of the SPOKE for which we don't have L-3-L2 mapping; and not to the next
> > hop of HUB interface; So we are unable to pong from spoke to spoke
> >
> > HTH
> > Gops
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > ccie ccie
> > Sent: Wednesday, November 28, 2007 16:04
> > To: Vaibhav Sharma
> > Cc: Cisco certification
> > Subject: Re: RIP over FR (hub&spoke) not working properly..
> > Importance: Low
> >
> > Hi Tech Lover,
> >
> > I dont have spoke to spoke mapping i only have HUB to Spoke mapping.
> > If i remove rip & put opsf with network type ip os net po to multi it
> > works.
> >
> > router rip
> > net 0.0.0.0
> >
> > remove eith ospf as below
> >
> > router os 1
> > network 0.0.0.0 0.0.0.0 ar 0 ( & network type ip os net point-to-mul
> > )
> >
> > its work fine. I can ping spoke to spoke & i learn all ospf routes.
> >
> > If i map spoke to spoke it will work.
> >
> > Question: (Note : HUB/SPOKE FR interface is main interface so by
> > default split hori is disable) 1. If i am learning network of one spoke
> > on another spoke why i cant ping in RIP case.
> > 2. Do we need spoke to spoke mapping in RIP if yes why why???
> >
> > Regards
> > Mike
> >
> >
> >
> >
> >
> >
> >
> >
> > On 11/28/07, Vaibhav Sharma <vaisharm@cisco.com> wrote:
> > >
> > > Do you have p2p subif on the spokes with the correct dlci specified?
> > > If you are using the main interface instead then you will have to have
> >
> > > static mapping between the spokes via the hub.
> > >
> > > -vaibhav
> > >
> > > ----- Original Message -----
> > > From: "ccie ccie" < cciefun@gmail.com>
> > > To: "Cisco certification" <ccielab@groupstudy.com>
> > > Sent: Wednesday, November 28, 2007 2:58 PM
> > > Subject: RIP over FR (hub&spoke) not working properly..
> > >
> > >
> > > > Hi Tech Lover,
> > > >
> > > > (spoke ) R1 <=====-FR static map========> - R2 Hub <======FR static
> > > > map====> --R3.
> > > >
> > > > No static/dynamic map between sopkes. I am running RIP V2 i am
> > > > getting routes of R1 in R3 & vice versa but unable to ping R1
> > > > loopback
> > > >
> > > > RIP config as below
> > > >
> > > > router rip
> > > > network 0.0.0.0
> > > >
> > > > Regads
> > > > Mike
> > > >
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