Re: no peeer neighbor-route ?

In the old days when we were using modems to connect to the Internet, if you
remember we had to insert a floppy and run that floppy, in that process what
used to happen was PPP encapsulation, this happened so your local host will
have a host route to the POP router, and the POP router will have a host
route for your local host. This is done by IPCP which is one of the
components of PPP.

NOWwhy remove the host route using the No peer neighbor-route???????

Lets say your primary link was a serial P2P or Frame-relay connection and
you had ISDN as a back up and you were running OSPF, if you remember you
would always have an encapsulation of PPP on your BRI interface. WHY? That
is a different discussion

But once you ran OSPF on the ISDN link, OSPF hellos will not allow your ISDN
link to ever go down and you would be billed for $$$$$$$$$$$$$ at the end of
the month, so people were using ip ospf demand-cir on the ISDN link, with
the demand circuit, OSPF brings down the ISDN circuit but it will maintain
its adjacency through the ISDN link.

The question is when would the ISDN link ever come up?

When OSPF detects a topology change

NOWlets say the primary link is up, and OSPF just brought down the ISDN
link because of the demand circuit command.

From PPPs perspective, the link is down so it removes the host route, but
when the host route is removed, OSPF sees a topology change, so it brings up
the ISDN link and begins to convey the changes, and guess what? PPP sees the
link up, and it injects the host route again. OSPF finishes its updates and
brings down the ISDN link, and once again the cycle repeats itself.

In order to avoid constant flapping of our ISDN link, we used to remove the
host route using the No peer neighbor-route, and if the host route is
removed, then, the ISDN link will NOT flap.

I hope this helped.

On Thu, Jun 23, 2011 at 8:51 AM, Abdullah Al-Malki
<a.almalki1402_at_gmail.com>wrote:

> Dear Imran,
> The peer neighbor route feature mainly was used to connect two sides using
> the same serial link but they are in different IP subnets (like the case of
> IP unnumbered).
> This is PPP feature only.
> .
> Regards,
> Abdullah
>
> On Thu, Jun 23, 2011 at 3:30 PM, imran ali <immrccie_at_gmail.com> wrote:
>
> > thnaks for reply ...
> >
> > On Thu, Jun 23, 2011 at 2:39 PM, Marko Milivojevic <markom_at_ipexpert.com
> > >wrote:
> >
> > >
> > > You must use "peer neighbr-route" with virtual templates, too.
> > >
> >
> >
> > >
> >
> > Correct about QoS. Take note that in some cases, default value of logical
> > > bandwidth on the interface is determined from the clock speed.
> > >
> > > in which cases ?...please elobrate ...
> >
> > > --
> > > Marko Milivojevic - CCIE #18427
> > > Senior Technical Instructor - IPexpert
> > >
> > > Free CCIE Training: http://bit.ly/vLecture
> > >
> > > Mailto: markom_at_ipexpert.com
> > > Telephone: +1.810.326.1444
> > > Community: http://www.ipexpert.com/communities
> > >
> > > :: Sent from my phone. Apologies for errors and brevity. ::
> > >
> > >
> > > On Jun 23, 2011, at 6:55, Oluseye Abimbolu <seyeabimbolu_at_gmail.com>
> > wrote:
> > >
> > > > AFAIK the peer neighbor-route is only for PPP links and not HDLC. As
> > > > per technical caveat, the only time you need the peer neighbor-route
> > > > command is when the ip addresses configured on different ends of a
> ppp
> > > > link are in different subnets.
> > > >
> > > > In QOS the router calculates the bandwidth using the bandwidth
> command
> > > > and NEVER the clock rate command.
> > > >
> > > > HTH
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
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>

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