From: Mike Loyer (mloyer@xxxxxxxxxxxxxx)
Date: Fri Aug 25 2000 - 11:29:33 GMT-3
pulled this from the cisco tips Q&A section
Q: Why are loopbacks advertised as /32 host routes in OSPF?
A: Loopbacks are considered host routes in OSPF, and they're advertised as /32.
For more information, see section 9.1 of RFC 2328. In Cisco IOS ® version 11.3
T and 12.0, if the ip ospf network point-to-point command is configured under l
oopbacks, then OSPF advertises the loopback subnet as the actual subnet configu
red on loopbacks.
----- Original Message -----
From: "Geatti" <geatti@home.com>
To: "Simon Baxter" <Simon.Baxter@au.logical.com>; "CCIE Group Study (E-mail)" <
ccielab@groupstudy.com>
Sent: Friday, August 25, 2000 11:20 AM
Subject: RE: 2nd attempt at a question!!
> someone mentioned you could change the network type with certain ios
> versions 'ip ospf network....' Haven't tried it myself yet but look back
> a few days and you'll find the post.
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of Simon Baxter
> > Sent: Friday, August 25, 2000 9:51 AM
> > To: CCIE Group Study (E-mail)
> > Subject: 2nd attempt at a question!!
> >
> > I'm doing a test lab which has asked me if there's any way to
> > advertise routes to loopback interfaces as anything but /32 routes.
> >
> > I can't see any way around this :
> >
> > Link connected to: a Stub Network
> > (Link ID) Network/subnet number: 130.130.33.1
> > (Link Data) Network Mask: 255.255.255.255
> > Number of TOS metrics: 0
> > TOS 0 Metrics: 1
> >
> > R4#sh ip os int lo0
> > Loopback0 is up, line protocol is up
> > Internet Address 130.130.33.1/24, Area 0.0.0.0
> > Process ID 10, Router ID 130.130.33.1, Network Type LOOPBACK, Cost:
> > 1
> > Loopback interface is treated as a stub Host
> > R4#
> >
> >
> > No matter what I do, it always stays as "Loopback interface is treated
> > as a stub Host"
> >
> >
> > Is this a trick question???
> >
> > I'm losing WAY too much sleep over it..
> >
> >
> > Simon
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