Re: EIGRP+PPP

Thanking all for this pond of info.

On Thu, Sep 2, 2010 at 2:05 PM, masroor ali <masror.ali_at_gmail.com> wrote:

> thanks alot everyone.
>
> On Thu, Sep 2, 2010 at 3:32 AM, Narbik Kocharians <narbikk_at_gmail.com>
> wrote:
>
> > hahahaha
> >
> > No man that is my age.
> >
> > On Wed, Sep 1, 2010 at 3:31 PM, Adrian Brayton <abrayton_at_gmail.com>
> wrote:
> >
> >> Could you guys be any older :) Hehehe! Narbik, is that really your CCIE
> #
> >> or is it your Social Security Number!
> >>
> >> Jokes aside, that was great! Thanks Narbik!
> >>
> >> Sent from my iPad
> >>
> >> On Sep 1, 2010, at 6:19 PM, Robert Hosford <rhosford_at_certifiednets.com>
> >> wrote:
> >>
> >> > Narbik,
> >> >
> >> > This post is an excellent example the little gotchas you can learn
> here.
> >> When ISDN was on the lab this was one of the issues you had to know
> cold.
> >> So thank you for the trip down memory lane.
> >> >
> >> > Robert
> >> >
> >> > -----Original Message-----
> >> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf
> Of
> >> Narbik Kocharians
> >> > Sent: Wednesday, September 01, 2010 5:54 PM
> >> > To: Marcelo Rosa
> >> > Cc: karim jamali; masroor ali; Cisco certification
> >> > Subject: Re: EIGRP+PPP
> >> >
> >> > Just to add to whats being said here.
> >> >
> >> > This behaviour was useful from the days when we used Modems to connect
> >> to the Internet (My grandma's days). You needed to know how to connect
> to
> >> the pop router and it needed to know how to connect to you. So you had
> to
> >> run PPP.
> >> >
> >> > Nowadays, we use this behavior to provide reachability, since PPP adds
> >> neighbor's IP address as a host route in your routing table the end
> points
> >> no longer need to be in the same subnet to have NLRI to each other.
> >> >
> >> > Why remove it?
> >> > Going back to Rocky Marciano days, when we had ISDN and we needed to
> use
> >> the ISDN link as a backup to a frame or other types of links. The second
> you
> >> did an "Encap ppp" under your BRI interface, ppp added the /32 host
> routes
> >> automatically (Default behaviour), now....let's say you are running OSPF
> >> over the main and your ISDN interfaces, we both know that OSPF's hellos
> will
> >> keep the ISDN link UP, unless you do an "IP OSPF DEMAND-CIR" under your
> BRI
> >> interface, which maintained the OSPF neighbor adjacency while bringing
> the
> >> ISDN link down, the ONLY time the ISDN link would ever come up is when
> OSPF
> >> detected a topology change. If you did not do this, end of the month you
> >> would get a bill for few thousand dollars for your ISDN usage. An RGE
> event
> >> (Resume Generated Event).
> >> >
> >> > But once OSPF establishes a nieghbor adjacency through the ISDN link
> and
> >> brings the ISDN link down, from PPP's perspective, the link was down so
> it
> >> removed the /32 route. Once the route was removed, from OSPF's
> perspective
> >> we had a topology change, so OSPF will bring the link back up to convey
> the
> >> changes, and the cycle repeated itself, so the end result was that the
> ISDN
> >> link kept on flapping. So what we had to do was to remove the host route
> by
> >> configuring "No peer neighbor-route".
> >> >
> >> > I hope this helped.
> >> >
> >> > On Wed, Sep 1, 2010 at 2:02 PM, Marcelo Rosa <MRosa_at_multirede.com.br>
> >> wrote:
> >> >
> >> >> These /32 routes exist to address the issue when you use ip unumbered
> >> >> and the borrowed ip addresses are not in the same subnet. As Karim
> >> >> stated, they make reachability possible. I you don4t need it, you can
> >> >> use the no peer neighbor-route to eliminate it.
> >> >>
> >> >> HTH,
> >> >>
> >> >>
> >> >> Marcelo Rosa
> >> >> http://codornafatiada.wordpress.com
> >> >> http://projectccie.wordpress.com
> >> >> Sent from my Ollivetti Lettera 82
> >> >>
> >> >> "It4s supposed to be hard. If it wasn4t hard everyone would do it.
> The
> >> >> hard is what makes it great."
> >> >>
> >> >>
> >> >>
> >> >> -----Mensagem original-----
> >> >> De: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] Em nome de
> >> >> karim jamali Enviada em: quarta-feira, 1 de setembro de 2010 17:57
> >> >> Para: masroor ali; Cisco certification
> >> >> Assunto: Re: EIGRP+PPP
> >> >>
> >> >> Dear Masroor,
> >> >>
> >> >> This has nothing to do with EIGRP. Just run PPP on both sides of the
> >> >> interface and you will see that peer neighbor route will always
> >> >> install the host route for the other side. This is PPP's normal
> >> >> behavior, well I kind of think about it "it is just 2 people on the
> >> >> link" so they must be able to reach each other. You can also try it
> >> >> with different subnets (1.1.1.1 and
> >> >> 3.3.3.3) for instance and you will see that the peer neighbor route
> >> >> makes reachability possible.
> >> >>
> >> >> HTH,
> >> >>
> >> >> Best Regards,
> >> >>
> >> >> On Wed, Sep 1, 2010 at 11:46 PM, masroor ali <masror.ali_at_gmail.com>
> >> wrote:
> >> >>
> >> >>> can you please describe more???
> >> >>>
> >> >>> On Thu, Sep 2, 2010 at 1:44 AM, rajeevan singh
> >> >>> <rajeevansingh_at_gmail.com
> >> >>>> wrote:
> >> >>>
> >> >>>> so no peer neighbor-route , on the link ( interface.)
> >> >>>>
> >> >>>> On Thu, Sep 2, 2010 at 2:12 AM, masroor ali <masror.ali_at_gmail.com>
> >> >>> wrote:
> >> >>>>
> >> >>>>> hi,
> >> >>>>>
> >> >>>>> when using ppp with eigrp, why it shows /32 neighbor route in
> >> >>>>> local routing table??? and using no peer neighbor-route it
> >> >>>>> doesnt show /32 route what's the idea?
> >> >>>>>
> >> >>>>> --
> >> >>>>> Regards,
> >> >>>>> Masroor Ali
> >> >>>>>
> >> >>>>>
> >> >>>>> Blogs and organic groups at http://www.ccie.net
> >> >>>>>
> >> >>>>>
> >> >>
> ______________________________________________________________________
> >> >> _
> >> >>>>> Subscription information may be found at:
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> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>
> >> >>>
> >> >>>
> >> >>> --
> >> >>> Regards,
> >> >>> Masroor Ali
> >> >>>
> >> >>>
> >> >>> Blogs and organic groups at http://www.ccie.net
> >> >>>
> >> >>> ____________________________________________________________________
> >> >>> ___ Subscription information may be found at:
> >> >>> http://www.groupstudy.com/list/CCIELab.html
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>
> >> >>
> >> >> --
> >> >> KJ
> >> >>
> >> >>
> >> >> Blogs and organic groups at http://www.ccie.net
> >> >>
> >> >>
> ______________________________________________________________________
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> >> >>
> >> >>
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> >> >>
> >> >>
> ______________________________________________________________________
> >> >> _ Subscription information may be found at:
> >> >> http://www.groupstudy.com/list/CCIELab.html
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >
> >> >
> >> > --
> >> > Narbik Kocharians
> >> > CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.MicronicsTraining.com
> <http://www.micronicstraining.com/>Sr. Technical Instructor YES! We take
> Cisco Learning Credits!
> >> > Training And Remote Racks available
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net
> >> >
> >> >
> _______________________________________________________________________
> >> > Subscription information may be found at:
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> >> >
> >> >
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> >> >
> >> >
> _______________________________________________________________________
> >> > Subscription information may be found at:
> >> > http://www.groupstudy.com/list/CCIELab.html
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >
> >
> >
> > --
> > Narbik Kocharians
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> > www.MicronicsTraining.com
> > Sr. Technical Instructor
> > YES! We take Cisco Learning Credits!
> > Training And Remote Racks available
> >
>
>
>
> --
> Regards,
> Masroor Ali
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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>
>
>
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>

-- 
Thanks & Regards,
Vivek Vidhate.
Blogs and organic groups at http://www.ccie.net