From: Casey, Paul (6822) (Paul.Casey@o2.com)
Date: Tue Nov 11 2003 - 04:45:40 GMT-3
I didnt think it had anything to do with OSPF but more related to PPP.
All why the /32 is keeping the line up is well documented on the Cisco
website...!!
If the ISDN link was HDLC I dont think the same problem would occur.
Anyone, any other explainations of this command..!!
What is peer neighbor route really for..!!
Kind regards.
Paul.
> -----Original Message-----
> From: ccie2be [SMTP:ccie2be@nyc.rr.com]
> Sent: Monday, November 10, 2003 9:08 PM
> To: Casey, Paul (6822); ccielab@groupstudy.com
> Subject: Re: peer neighbor route.,
>
> When redistribution into OSPF is taking place on one of the routers on one
> end of the link and the ip subnet of the link is included under the ospf
> process, using this command stop the isdn link from flapping.
>
> I don't remember all the details but the way I understand it is that
> without
> this command, when the isdn link comes up (from interesting traffic for
> example), ospf will install a new /32 route in the route table. When the
> link goes down, ospf removes the route, But when the /32 route is removed
> that means there's been a topology change. OSPF, being a routing
> protocol,
> must, of course, notify all it's neighbors of the topology change and send
> out a new LSA to do this. And, this new LSA has to, of course, reach the
> other side of the isdn link so ospf brings up the link. Once the link is
> up
> that /32 route is again installed in the route table only to go away again
> after the link goes back down. And, so the cycle repeats.
>
> To stop this cycle, the no peer neighbor command prevents the /32 route
> from
> being installed in the route table in the first place.
>
> I forget the roll that redistribution plays in this scenario, but I know
> that this is explained very well in the book, Troubleshooting IP Routing
> Protocols in the section on flapping isdn links (or using the ip ospf
> demand
> circuit command).
>
>
> ----- Original Message -----
> From: "Casey, Paul (6822)" <Paul.Casey@o2.com>
> To: <ccielab@groupstudy.com>
> Sent: Monday, November 10, 2003 2:39 PM
> Subject: peer neighbor route.,
>
>
> > Hello,
> >
> > I am been looking this peer neighbor route command used under PPP.
> > Can someone explain to me what this command is actually for,
> > Yes, I have read that you can remove the /32 host routes it installs
> from
> > the far side of the link,
> > used for ISDN ..by typing the no form of the command.
> > but what is the purpose of this command when its turned on.
> >
> > ex: Why would I want to use this command in the first place - or more to
> the
> > point what can I not do without it,..? What do I need /32 host routes
> for.
> > Anyone got an example.
> >
> > Cisco website is vague of this stuff. or maybe its just the links I can
> find
> > are vague.
> >
> > Any help appreciated.
> > Kind regards.
> >
> >
> >
> >
> >
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