Re: Frame-Relay, RIP & Split-Horizon

just to give you some validation to your conclusions:

RFC 2453 - RIPv2 --

*"4.4 Next Hop

   The immediate next hop IP address to which packets to the destination
   specified by this route entry should be forwarded. Specifying a
   value of 0.0.0.0 in this field indicates that routing should be via
   the originator of the RIP advertisement. "*

On Thu, Jul 14, 2011 at 9:25 AM, Aaron Riemer <ariemer_at_amnet.net.au> wrote:

> Yes that is what I love about this forum :)
>
> You get different peoples perspectives and this can make you think about
> things from a different point of view.
>
> I agree with you. The routes are obviously suppressed and I think you make
> a
> valid point regarding the next hop value.
>
> Thanks,
>
> -Aaron.
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Roy
> Khan
> Sent: Thursday, 14 July 2011 2:06 PM
> To: ariemer_at_amnet.net.au; joeastorino1982_at_gmail.com
> Cc: ccielab_at_groupstudy.com
> Subject: RE: Frame-Relay, RIP & Split-Horizon
>
> At the end we all are there to discuss our views , ideas and thinkings
>
> From: roykhan123_at_hotmail.com
> To: ariemer_at_amnet.net.au; joeastorino1982_at_gmail.com
> CC: ccielab_at_groupstudy.com
> Subject: RE: Frame-Relay, RIP & Split-Horizon
> Date: Thu, 14 Jul 2011 12:04:55 +0600
>
>
>
>
>
>
>
>
> Yes but i am not 100 percent sure about it it could be one of the possible
> reason..
> > From: ariemer_at_amnet.net.au
> > To: roykhan123_at_hotmail.com; joeastorino1982_at_gmail.com
> > CC: ccielab_at_groupstudy.com
> > Subject: RE: Frame-Relay, RIP & Split-Horizon
> > Date: Thu, 14 Jul 2011 13:48:31 +0800
> >
> > Hi Roy,
> >
> >
> >
> > Are you saying the RIP response route is suppressed from the 'debug ip
> rip'
> > output on R2 because it sees that the next hop (12.12.12.2) is itself?
> >
> >
> >
> > Cheers,
> >
> >
> >
> > -Aaron.
> >
> >
> >
> > From: Roy Khan [mailto:roykhan123_at_hotmail.com]
> > Sent: Thursday, 14 July 2011 1:04 PM
> > To: joeastorino1982_at_gmail.com; ariemer_at_amnet.net.au
> > Cc: ccielab_at_groupstudy.com
> > Subject: RE: Frame-Relay, RIP & Split-Horizon
> >
> >
> >
> >
> > this is because of next hop value.
> >
> >
> >
> > Next Hop identifies a better next-hop address, if one exists, than the
> > address of the advertising router. That is, it indicates a next-hop
> address,
> > on the same subnet, that is metrically closer to the destination than the
> > advertising router is. If the field is set to all zeros (0.0.0.0), the
> > address of the advertising router is the best next-hop address.
> >
> >
> >
> > here r1 is sending back to r2 but look the next hop value 2.2.2.2/32 via
> > 12.12.12.2, metric 2, tag 0
> >
> >
> >
> >
> >
> > > Date: Wed, 13 Jul 2011 21:22:40 -0400
> > > Subject: Re: Frame-Relay, RIP & Split-Horizon
> > > From: joeastorino1982_at_gmail.com
> > > To: ariemer_at_amnet.net.au
> > > CC: ccielab_at_groupstudy.com
> > >
> > > OK I have simplified this whole thing to show the root of the problem.
> > >
> > > Now we simply have the easiest thing in the world R1 ----- R2 connected
> > via
> > > ethernet. Split-Horizon is disabled on R1. R1 and R2 have RIP v2
> enabled
> > > on the ethernet segment 12.12.12.0/24. R2 advertises in 2.2.2.2.
> > >
> > > R2 sends the route...
> > >
> > > RIP: sending v2 update to 224.0.0.9 via FastEthernet0/0 (12.12.12.2)
> > > RIP: build update entries
> > > 2.2.2.2/32 via 0.0.0.0, metric 1, tag 0
> > > 12.12.12.0/24 via 0.0.0.0, metric 1, tag 0
> > >
> > > R1 receives it and sends it back to R2...
> > >
> > > RIP: received v2 update from 12.12.12.2 on FastEthernet0/0
> > > 2.2.2.2/32 via 0.0.0.0 in 1 hops
> > > 12.12.12.0/24 via 0.0.0.0 in 1 hops
> > > RIP: Update contains 2 routes
> > > R1#
> > > RIP: sending v2 update to 224.0.0.9 via FastEthernet0/0 (12.12.12.1)
> > > RIP: build update entries
> > > 2.2.2.2/32 via 12.12.12.2, metric 2, tag 0
> > > 12.12.12.0/24 via 0.0.0.0, metric 1, tag 0
> > > RIP: Update contains 2 routes
> > > RIP: Update queued
> > > RIP: Update sent via FastEthernet0/0
> > >
> > >
> > > R2 receives the update...but alas 2.2.2.2 has disappeared from "debug
> ip
> > > rip". Am I losing my marbles?
> > >
> > > RIP: received v2 update from 12.12.12.1 on FastEthernet0/0
> > > 12.12.12.0/24 via 0.0.0.0 in 1 hops
> > >
> > >
> > >
> > > On Wed, Jul 13, 2011 at 9:03 PM, Joe Astorino
> > <joeastorino1982_at_gmail.com>wrote:
> > >
> > > > It's actually driving me a bit mad right now.... I came to the same
> > > > conclusion...hold down timer has nothing to do with it, I had just
> > jumped
> > > > the gun and was confused for a minute.
> > > >
> > > > I am still not sure why on the spoke I don't see the route at least
> in
> > the
> > > > RIP database or in the debug ip rip output. I keep thinking it must
> be
> > > > something silly and simple I just can't put my finger on it right now
> > > >
> > > >
> > > > On Wed, Jul 13, 2011 at 8:59 PM, Aaron Riemer
> > <ariemer_at_amnet.net.au>wrote:
> > > >
> > > >> Hi Joe,
> > > >>
> > > >> Wouldn't the routes in question have to be in hold down first?
> > > >>
> > > >> I labbed this up as well. You can definitely see the routes being
> > > >> advertised
> > > >> from the spoke to the hub and back to the spoke again (wireshark). I
> > would
> > > >> say that IOS is silently binning the route has it has a higher
> metric
> > > >> before
> > > >> the debugging process is invoked.
> > > >>
> > > >> Would be good to know for sure though :)
> > > >>
> > > >> Cheers,
> > > >>
> > > >> -Aaron.
> > > >>
> > > >> -----Original Message-----
> > > >> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf
> Of
> > > >> Joe
> > > >> Astorino
> > > >> Sent: Thursday, 14 July 2011 8:24 AM
> > > >> To: Cisco certification
> > > >> Subject: Re: Frame-Relay, RIP & Split-Horizon
> > > >>
> > > >> OK so I think I figured it out. Simple -- RIP hold timer. If a RIP
> > router
> > > >> sees a route with a HIGHER metric hop-count than the one it
> currently
> > has,
> > > >> the hold timer has to expire first to prevent what I'm trying to do
> > from
> > > >> happening : ) So ...not nearly as dramatic as I had thought and has
> > > >> NOTHING
> > > >> to do with frame-relay and DLCIs, just a general function of RIP
> > > >>
> > > >> I'm pretty sure it is just a hold timer thing.
> > > >>
> > > >> This is what happens when I don't get enough sleep or as Scott would
> > say
> > > >> "not nearly enough caffeine". Still, thanks for reading and I
> welcome
> > > >> any
> > > >> comments
> > > >>
> > > >>
> > > >> --
> > > >> Regards,
> > > >>
> > > >> Joe Astorino
> > > >> CCIE #24347
> > > >> Blog: http://astorinonetworks.com
> > > >>
> > > >> "He not busy being born is busy dying" - Dylan
> > > >>
> > > >>
> > > >> Blogs and organic groups at http://www.ccie.net
> > > >>
> > > >>
> _______________________________________________________________________
> > > >> Subscription information may be found at:
> > > >> http://www.groupstudy.com/list/CCIELab.html
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > > --
> > > > Regards,
> > > >
> > > > Joe Astorino
> > > > CCIE #24347
> > > > Blog: http://astorinonetworks.com
> > > >
> > > > "He not busy being born is busy dying" - Dylan
> > > >
> > > >
> > >
> > >
> > > --
> > > Regards,
> > >
> > > Joe Astorino
> > > CCIE #24347
> > > Blog: http://astorinonetworks.com
> > >
> > > "He not busy being born is busy dying" - Dylan
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Shiran Guez
MCSE CCNP NCE1 JNCIA-ENT JNCIS-ENT CCIE #20572
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