From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Mar 26 2003 - 17:21:19 GMT-3
I don't disagree that I was veering slightly off-topic by not directly
addressing the question. But interesting, nonetheless, eh?
As far as the area numbers, they are stored as 32-bit numbers and sent
as 32-bit numbers in the OSPF header, regardless of how you enter them
at the command line.
> -----Original Message-----
> From: Tim Fletcher [mailto:tim@fletchmail.net]
> Sent: Wednesday, March 26, 2003 2:06 PM
> To: Jonathan V Hays; 'Angelo De Guzman'; CCIELAB@groupstudy.com
> Subject: RE: Defining OSPF Area
>
>
> But the question, at least as I understood it, was about area
> numbers, not
> network numbers.
>
> area 0 ...
> network <addr> <mask> area 0
>
> vs
>
> area 0.0.0.0 ...
> network <addr> <mask> area 0.0.0.0
>
> -Tim Fletcher
>
> At 01:59 PM 3/26/2003 -0500, Jonathan V Hays wrote:
> >On page 295 of the "Cisco OSPF Command and Configuration
> Handbook" Bill
> >Parkhurst says:
> >
> > "One problem that can arise when using a host address in
> the [OSPF]
> >network statement is if the IP address of the interface
> changes. If you
> >change the IP address of the Ethernet interface on Router A from
> >172.16.1.1 to 172.16.1.3, then the interface will no longer
> be enabled
> >for OSPF. You need to delete the network statement
> containing the host
> >router 172.16.1.1 and re-enter the network statement using the host
> >route 172.16.1.3."
> >
> >His point is that using "network 172.16.1.0 0.0.0.255" avoids this
> >minor problem. When you change the interface IP address you will NOT
> >have to re-enter the network statement. With the /24
> wildcard mask you
> >will
> >*still* momentarily lose your OSPF neighbor connection on
> that interface
> >when you change the interface IP address - but it will
> automatically be
> >reestablished without needing to muck around with the OSPF network
> >command.
> >
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf
> > > Of Tim Fletcher
>
> > > Sent: Wednesday, March 26, 2003 10:35 AM
> > > To: Angelo De Guzman; CCIELAB@groupstudy.com
> > > Subject: Re: Defining OSPF Area
> > >
> > >
> > > Angelo,
> > >
> > > It is just 2 ways of representing it on the router, and
> is strictly
> > > a mater of personal preference. In fact you can configure two
> > > routers using different formats on each one, and as long as the
> > > numbers match, it will
> > > work. For example a router configured with area 1000 will
> > > work just fine
> > > with a router configured with area 0.0.0.3.232.
> > >
> > > Sometimes a dotted notation will be used in a hub and spoke
> > > topology, where each spoke is in a separate area. To simplify
> > > troubleshooting, you can use
> > > the same area number as the block of IPs assigned to that spoke.
> > >
> > > -Tim Fletcher
> > >
> > > At 10:25 PM 3/25/2003 -0800, Angelo De Guzman wrote:
> > > >Hi To All,
> > > > What is the best practice in computer the OSPF
> > > >area. Use 0 or 0.0.0.0. All routers are Cisco. Please
> enumerate the
> > > >advantage and desadvantage of using each. Specially in
> > > troubleshooting
> > > >and configuration wise?
> > > >Thanks in Advance,
> > > >Angelo
> > > >
> > > >__________________________________________________
> > > >Do you Yahoo!?
> > > >Yahoo! Platinum - Watch CBS' NCAA March Madness, live on
> > > your desktop!
> > > >http://platinum.yahoo.com
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