From: Jason Sinclair (sinclairj@powertel.com.au)
Date: Mon Feb 17 2003 - 19:17:08 GMT-3
Mark,
I must disagree with this. As per RFC 2328 (OSPF V2) 1998, Section 3.1:
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.
This precludes your concept, however in saying that I would add that a
Vendor may have coded an OSPF implementation where the backbone area ID
could be user defined, however I find that highly unlikely.
Regards,
Jason Sinclair CCIE #9100
Manager, Network Control Centre
POWERTEL
55 Clarence Street,
SYDNEY NSW 2000
AUSTRALIA
office: + 61 2 8264 3820
mobile: + 61 416 105 858
email: sinclairj@powertel.com.au
-----Original Message-----
From: Joe [mailto:groupstudy@comcast.net]
Sent: Tuesday, 18 February 2003 06:35
To: 'Mark Miller'; 'Sam Munzani'; ccielab@groupstudy.com
Cc: cciesecurity@yahoogroups.com
Subject: RE: Can you have OSPF without area 0 at all?
Please send us the link you refer to. I have to say that this is simply
not true. You will ONLY send routes from your area, whatever it may be,
into area 0, the backbone, so you can't just arbitrarily designate any
area as the backbone. It MUST be area 0.
Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mark Miller
Sent: Friday, February 14, 2003 6:15 PM
To: Sam Munzani; ccielab@groupstudy.com
Cc: cciesecurity@yahoogroups.com
Subject: Re: Can you have OSPF without area 0 at all?
The routing process in ospf has no concept that "area 0" is the backbone
area. You can make it any number you want. I remember reading
something on this. I'll try to dig it up and send you a link.
Mark Miller
----- Original Message -----
From: "Sam Munzani" <sam@munzani.com>
To: <ccielab@groupstudy.com>
Cc: <cciesecurity@yahoogroups.com>
Sent: Friday, February 14, 2003 12:56 PM
Subject: Can you have OSPF without area 0 at all?
> Team,
>
> I came across an interesting finding. I want to take everybody's
> opinion
on this before putting anything in production. We are building an OSPF
network that will eventually merge with company's main OSPF backbone
network. The core group has assigned us ospf area number 555.
>
> When I configure all my routers with OSPF area 555(with no area 0 at
> all),
it seems to be building up routing table. I always thought OSPF needs
area 0 to function. Will this work of we add a non cisco device with
area 555 configuration?
>
> What is the catch 22 in this configuration? I have started reading
> OSPF
RFC to figure out all technical details.
>
> Thanks,
> Sam Munzani
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