From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Sun Dec 22 2002 - 14:36:56 GMT-3
I like Sage's fix for non-Backbone areas. It does create external routes.
I read someone else's fix that works if the Loopbacks are in a backbone area
router. That is to create another area in that router effectively making
that router an ABR for the new area. This can be done in several ways, but
if possible I like creating a new Loopback interface specifically for this
purpose. The IP address of the new Loopback interface needs to be in the the
address space that would be used if you summarized all of the other
Loopbacks. An example:
The exiting loopbacks are in Area 0 and they are:
lo0= 139.7.1.1/32
lo1= 139.7.1.2/32
lo3= 139.7.1.3/32
etc.
Make a new loopback --- lo254= 139.7.1.254/32
put that loopback in it's own area --- network 139.7.1.254 0.0.0.0 area 254
make a range command for the new area -- area 254 range 139.7.1.0
255.255.255.0
This should create a summary address to null in the routing table
139.7.1.0/24
It doesn't matter that all the other loopbacks are in a different area. All
traffic for the 139.7.1.0/24 net comes to the object router where it can
resolve the specific loopback addresses.
Like I said, someone else has already suggested this. Let me know if this
works.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Evgeny Tantsura
Sent: Sunday, December 22, 2002 7:24 AM
To: Sage Vadi
Cc: ccielab@groupstudy.com
Subject: Re: OSPF: summarization of loopbacks - is it possible?
Hi,
You can summarize only on the boundary, ie between two areas.
> Hi!
>
> I have x amount of loopback interfaces configured in
> my internal router. I need to summarize them. Loopback
> interfaces by default are host routes, workaround is
> to enable "ip ospf net point-to-point" under their
> local interface - and their actual subnet is
> advertised.
>
> That is fine.
>
> But the problem is that loopback interfaces when they
> are advertised using the network command ie - NOT
> redistribute connected. Seem NOT to be able to be
> summarized using the area range command. When I use
> the redistribute connected and summary-address - this
> works!!!
>
> What is the problem here? Or is redistribute-connected
> inclusive of summary-address the ONLY way to summarize
> loopback networks?
>
> rgds,
> Sage
>
>
>
>
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With kind regards/ met vriendelijke groeten,
------------------------------------------------
E. Tantsura
Network Developer
Essent Kabelcom N.V.
Dr.van Deenweg 84
8025BN Zwolle, The Netherlands
Tel: +31-(0)38-850-7642
Fax: +31-(0)38-850-7410
Mob: +31-(0)6-290-80458
------------------------------------------------
.
.
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