From: Erick B. (erickbe@xxxxxxxxx)
Date: Sat Dec 02 2000 - 07:13:00 GMT-3
This works as well. Just tried it on 12.0(5) Mainline
All you need to do is shutdown the interface. OSPF
will start using the highest active IP address
automatically or if you shutdown all your IP
interfaces, it spits out this error over and over
again which is expected.
2w2d: %OSPF-4-NORTRID: Could not allocate router ID
- Erick
24d: %VOTE-2000: Counting error in FL, USA
--- George Zhang <gyzhang@bigfoot.com> wrote:
> If you configured OSPF before you configured an loop
> back interface, the RID will be
> the ip address of a physical interface. Then, after
> you configuring an loopback
> interface, you can do shut/no shut on the physical
> interface that has the RID as its
> ip address. By doing so, the RID will be changed to
> the ip address of the loopback
> interface. At least, it worked for me the other day
> (with IOS 11.3). Correct me if I
> am wrong.
>
> George Zhang
>
> Chuck Larrieu wrote:
>
> > Jiang, I'm running IOS 12.1 in my lab. Clear IP
> OSPF process does not clear
> > out bad or old RID information
> >
> > Various experiments over the last couple of days,
> both as a result of this
> > thread and private conversations, led to my
> discovery that blowing out the
> > OSPF configuration completely, then rebuilding it,
> will remove the bad
> > information ( such as a bad neighboring RID ). And
> so will reloading the
> > router. But once RID's are learned, at least in
> what I have seen so far, it
> > is hell getting "rid" of them.
> >
> > Chuck
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of Wu,
> > Jiang
> > Sent: Friday, December 01, 2000 9:00 PM
> > To: ccielab@groupstudy.com
> > Subject: Re: OSPF Lab - DR behaviour with
> loopbacks WAS: RE: question about
> > loopback interfaces
> >
> > In some ios versions (maybe 12.0 GD), you can use
> "clear ip ospf process"
> > command to restart OSPF.
> >
> > Wu
> >
> > ----- Original Message -----
> > From: Tony Olzak <aolzak@buckeye-express.com>
> > To: <erickbe@yahoo.com>; Chuck Larrieu
> <chuck@cl.cncdsl.com>; Louie Belt
> > <louieb@netmatter.com>; 'CCIE_Lab Groupstudy List'
> <ccielab@groupstudy.com>;
> > <cisco@groupstudy.com>
> > Sent: Saturday, December 02, 2000 5:16 AM
> > Subject: Re: OSPF Lab - DR behaviour with
> loopbacks WAS: RE: question about
> > loopback interfaces
> >
> > > I usually just reboot routers on the fly and
> work on something else while
> > > that router is rebooting.
> > >
> > >
> > > Tony
> > >
> > > ----- Original Message -----
> > > From: "Erick B." <erickbe@yahoo.com>
> > > To: "Tony Olzak" <aolzak@buckeye-express.com>;
> "Chuck Larrieu"
> > > <chuck@cl.cncdsl.com>; "Louie Belt"
> <louieb@netmatter.com>; "'CCIE_Lab
> > > Groupstudy List'" <ccielab@groupstudy.com>;
> <cisco@groupstudy.com>
> > > Sent: Friday, December 01, 2000 3:35 PM
> > > Subject: Re: OSPF Lab - DR behaviour with
> loopbacks WAS: RE: question
> > about
> > > loopback interfaces
> > >
> > >
> > > > If you remove the router ospf configuration
> and paste
> > > > it back, OSPF will restart with a new router
> ID if you
> > > > have a new high IP address. You can only do
> this in a
> > > > test/non-production network environment
> though. I've
> > > > done this before in my labs because it is
> faster then
> > > > waiting for the router to reboot.
> > > >
> > > > > And you are right, the RID doesn't change at
> all
> > > > > without rebooting the
> > > > > router. But, what do most techs do when a
> link is
> > > > > having problems? Reboot
> > > > > the routers. Now your RID will change.
> > > > >
> > > > > Tony
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