From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed May 04 2005 - 12:05:03 GMT-3
It is just different notation. Area 0.0.0.0 is the same as area
0. Area 0.0.0.1 is the same as area 1.
<RFC 2328>
3.1. The backbone of the Autonomous System
The OSPF backbone is the special OSPF Area 0 (often written as
Area 0.0.0.0, since OSPF Area ID's are typically formatted as IP
addresses). The OSPF backbone always contains all area border
routers. The backbone is responsible for distributing routing
information between non-backbone areas. The backbone must be
contiguous. However, it need not be physically contiguous;
backbone connectivity can be established/maintained through the
configuration of virtual links.
</RFC 2328>
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> George He
> Sent: Wednesday, May 04, 2005 1:54 AM
> To: Jim; gladston@br.ibm.com; ccielab@groupstudy.com
> Subject: RE: 0.0.0.1 on OSPF hello
>
> I remember that if you run OSPF on Windows 2000 box, the area ID like
> 0.0.0.1 or something like this.
>
> Cheers
>
> George
> -----Original Message-----
> From: Jim [mailto:nhatquang@thiennam.org]
> Sent: Wednesday, 4 May 2005 3:32 PM
> To: gladston@br.ibm.com; ccielab@groupstudy.com
> Subject: Re: 0.0.0.1 on OSPF hello
>
> how is the config? it looks like a router-id than an ip address.
>
> ----- Original Message -----
> From: <gladston@br.ibm.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, May 04, 2005 3:55 AM
> Subject: 0.0.0.1 on OSPF hello
>
>
> > Do you know what OSPF means with 0.0.0.1?
> >
> > It is a non-broadcast net, R2 is sending hello to R5. Debug ip ospf
> hello
> > and debug ip packet det are enabled.
> >
> > Send hello to 0.0.0.1
> >
> > Debug ip packet confirms that the destination IP of the hello is
> unicast
> > address. Area is 0.
> >
> >
> > r2#
> > *Mar 1 03:02:11.716: OSPF: Send hello to 0.0.0.1 area 0 on
> Serial0/0.257
> > from 172.16.200.2
> > *Mar 1 03:02:11.716: IP: s=172.16.200.2 (local), d=172.16.200.7
> > (Serial0/0.257), len 124, sending, proto=89
> >
> >
> > When the network is broadcast, it says "Send hello to 224.0.0.5"
which
> > really is the destination IP.
> > But when it is non-broadcast, it seems there is no sense on
"0.0.0.1".
> > (well, I must say, I could not find the sense, hope feedback clarify
> it).
> >
> > r2#sh deb con
> > *Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on
> Ethernet0/0
> > from 172.16.26.2
> > *Mar 1 03:06:19.834: OSPF: Send hello to 224.0.0.5 area 11 on
> Ethernet0/1
> > from 172.16.29.2
> >
> >
>
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