From: Logan, Harold (loganh@xxxxxxxxxxxx)
Date: Tue Apr 16 2002 - 14:12:54 GMT-3
I ran into the same problem. A gentleman on the list by the name of Chang took
the time to email Karl Solie with a few questions about this scenario. He poste
d the reply a couple weeks ago; I'll re-post the relevant parts:
<snip>
To answer your questions, Yes use the default-network to solve this. This in
one way, and the way I wanted you to use. They really like to make sure you
know all the ins and outs of propagating a default network. This network
should also be summarized at a 15 bit boundary like you did.
<snip>
Basically he was saying to use the ip default-network command to get the 151.10
0 network into IGRP. Myself, I'm pretty stubborn, plus I don't know if that sol
ution would be acceptable for the lab, since ip default-network puts a static r
oute in the router's config.
The approach we used when some friends and I went through this was to summarize
at /15 in EIGRP, and redistribute EIGRP into OSPF at R2. At R2 we also tried s
everal different summary-addresses, and at R3 we redistributed OSPF into IGRP.
What was odd was, we could get the 172 network from R5's loopback interface to
show up on R6, but not the 151 network. We tried summarizing it at both a class
B and class A boundary, but couldn't get either of those to work. Whatever we
used as a summary address would show up in R3's table as learned by OSPF, but f
or some reason IGRP didn't want to take it. I'll try my hand at it again if I e
ver lab up skynet again, but I've already spent a lot of time on that one and m
y lab is in July, so I doubt I'll revisit it anytime soon.
-----Original Message-----
From: Dennis.D.Adekola@britishairways.com
[mailto:Dennis.D.Adekola@britishairways.com]
Sent: Tuesday, April 16, 2002 11:36 AM
To: Muhamamd Durrani
Cc: ccielab@groupstudy.com
Subject: Re: OSPF - IGRP
It's a good thing this discussion has come up
And i know it's one that will keep rearing it's ugly head
If anyone has done the skynet lab from the sollie book
On router 5(running EIGRP) you are meant to summarize 151.100.1.1/24 and
151.101.1.1/24
This should give 151.100.0.0/14
You are required to get this subnet into IGRP on R6 which is a /24
But between the R5 and the R6 is an ospf domain.
I have done the required redistribute connected
Then done a summary address to a /24 on the ASBR of the OSPF domain
But still fail to see the 151.100.00 network on R6 in the eigrp domain
I hope i have't ended up confusing all
If you've done this lab before you'll probably understand
Phew !!!!!!!!!!!
D
Muhamamd Durrani <dan_schaw@yahoo.com>@groupstudy.com on 16/04/2002
14:56:26
Please respond to Muhamamd Durrani <dan_schaw@yahoo.com>
Sent by: nobody@groupstudy.com
To: Tarek Sabry <tsabry
cc: ccielab
bcc:
Subject: Re: OSPF - IGRP
Hi Tarek ,
With Summary-Address you cannot re-distribute to other
routing protocol . Its for the Summary Address for
Ecternal Routes .
I would rather say create a Summary Address with "Area
range " commad on the router you want to summarized
the addresses on, with the mask configured on the
interfaces running IGRP. If the mask is now same as
configured on IGRP interfaces than you wil not see the
route on IGRP router .
Another way that I could see is to create a static
route on ASBR to NULL 0 and redistribute static into
IGRP process ..but again the mask SHOULD match with
interaces configured with IGRP .
Let me know id I am wrong .
Regards,
Muhammad
--- Tarek Sabry <tsabry@houston.sns.slb.com> wrote:
> Hi
>
> I understand that there may be more than one way to
> redistribute VLSM into
> FLSM. However the only way that seems to work for me
> when redistributing
> OSPF into IGRP is the brilliant method suggested by
> someone a little while
> back, whereby I need to create an intermediate OSPF
> process. I don't feel
> comfortable with just this way though, because the
> proctors may object to
> it.
>
> So let's say we have a /26 network connected to the
> OSPF side of the
> redistributing router. Someone had suggested before
> that a good way of
> achieveing what I want would be to redistribute
> connected into OSPF and
> create a "summary-address" of a /24, and this route
> would be redistributed
> into IGRP with the rest of the OSPF routes.
>
> Is that supposed to work??? Well doesn't the
> "summary-address" inject a
> route INTO OSPF and not OUT OF it?? Also how come I
> do not see any routes to
> "Null 0" after I create my OSPF summary address?
>
> What are common gotchas for OSPF summaries??
>
> Thanks a lot
> Tarek
>
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