From: Hobbs (deadheadblues@gmail.com)
Date: Sat Feb 14 2009 - 19:34:15 ARST
There's actually a nice explanation in this book right here on page 153:
http://www.amazon.com/OSPF-Anatomy-Internet-Routing-Protocol/dp/0201634724
It is in the FAQ section and the question is "Why is the
representation of point-to-point links so strange?"
The answer is pretty long but it summarizes by saying "...an option
was added to represent the links in a fashion identical to that used
by RIP. Assign a subnet to the point-to-point link and have the router
at each end of the link advertise a stub link to the subnet."
I won't pretend to know what that means, but maybe if you find a copy
of that book it will help you understand a little better...
On Sat, Feb 14, 2009 at 10:56 AM, Jared Scrivener
<jscrivener@ipexpert.com> wrote:
> Is that for a PPP link? I haven't looked at the OSPF database for this and
> don't have a router available right now to test (so I could be wrong and
> hence am speculating a bit) but PPP will normally send a /32 host route to
> its neighbor.
>
> That route would show as a connected route on the receiving device. If the
> receiving device is advertising the /32 route into its OSPF database then
> OSPF could be interpreting that /32 route (by contrast to the probable /30
> that you also have for the point-to-point link) as a stub host entry.
>
> The stub host network type is usually used for loopbacks, so it wouldn't
> surprise me if the /32 host route also was considered a stub host.
>
> Cheers,
>
> Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
> Technical Instructor - IPexpert, Inc.
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: jscrivener@ipexpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jordan
> Sent: Saturday, 14 February 2009 7:08 AM
> To: Cisco???
> Subject: OSPF stub network type
>
> Hi,guys,
> I've been wondering that why it had been showed with the command show ip
> ospf database x.x.x.x that came out a point-to-point interface and at the
> same time also had a stub network type for the same interface. Book said a
> stub network type is a network that had no neighbor. But a point-to-point
> interface such as a serial interface do have a neighbor. Why is it just
> discribed as a stub network type?
> thanks in advacne.
>
> Jordan.
>
>
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