From: Tim Fletcher (tim@fletchmail.net)
Date: Wed Mar 26 2003 - 16:06:14 GMT-3
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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