Re: Question: Why use network X.X.X.X 0.0.0.0 area 0?

Hey Justin,

The no passive interface command and the network command serve 2 seperate
functions.

The net 192.16.1.1 0.0.0.0 area 0 command stars advertising that interface
subnet into OSPF.

The no passive interface command allows other OSPF devices on that interface
to peer.

So being more specific about the interface is not a replacement for the no
passive command. It's always a good idea to do no passive on specific
interfaces so you dont get unwanted neighbors from backbone routers or
devices taht are supposed to be in other areas/processes.

Don.

On Sun, Oct 18, 2009 at 9:47 PM, Justin Mitchell <jgmitchell_at_gmail.com>wrote:

> Thanks Anthony, that is the kind of explanation I was looking for. I
> typically use passive-interface default and then enable the ones I
> need. This seems a like a better idea because I have a tendency to
> forgot to issue the no passive-interface command.
>
> Justin G. Mitchell
> http://www.google.com/profiles/jgmitchell
>
>
>
> On Sun, Oct 18, 2009 at 3:08 PM, Anthony Sequeira <asequeira_at_ine.com>
> wrote:
> > Most of us do this to not accidentally bring another interface into the
> OSPF
> > domain.
> >
> > The "equivalent" configuration approaches you will often see for the
> other
> > IGPs are:
> >
> > router eigrp 100
> > network 172.16.1.1 0.0.0.0
> >
> > and
> >
> > router rip
> > version 2
> > passive-interface default
> > network 172.16.0.0
> > no passive-interface fa0/0
> >
> > Warmest Regards,
> >
> > Anthony J. Sequeira, CCIE #15626
> > http://www.INE.com <http://www.ine.com/>
> >
> > Test your Core Knowledge today!
> > Q: What is the default OSPF network type for a Frame Relay multipoint
> > sub-interface?
> > A: nonbroadcast
> > More Info:
> >
> http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080094054.shtml
> >
> >
> > On Oct 18, 2009, at 3:52 PM, Justin Mitchell wrote:
> >
> >> Why would you use network 192.168.1.1 0.0.0.0 area 0? I understand
> >> this is to place just the interface into area 0, but why not use
> >> 0.0.0.255 or whatever the wildcard mask would normally be?
> >>
> >> This configuration is on frame-relay and ethernet interfaces.
> >>
> >> Justin G. Mitchell
> >> http://www.google.com/profiles/jgmitchell
> >>
> >>
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Received on Mon Oct 19 2009 - 11:43:19 ART