From: Landon Fitts (l.fitts@xxxxxxxxxxxxxx)
Date: Wed Apr 03 2002 - 22:26:41 GMT-3
Guy,
It seems that if I use a secondary address on a router that isn't attached
to the IGRP domain, it would be no different than creating a loopback
with that same address. I see a problem with this for the following reason.
Simple example:
R1===============R2================R3
OSPF OSPF|IGRP IGRP
150.100.1.1/30 = lo0 at R1
150.100.2.1/30 = serial link between R1 & R2
150.100.3.1/24 = serial link between R2 & R3
I want R3 to see network 150.100.1.0/30, so I need to make it
appear as 150.100.1.0/24 to R3. If I create a secondary address
of 150.100.1.x/24 on link between R1 & R2, this isn't allowable
because it overlaps with 150.100.1.1/30, same would be the case
if you create a loopback on either R1 or R2.
I could possibly see a tunnel solution working between R2 & R3
making the tunnel addresses say 150.100.4.1&2/30. Then, R2
would be able to send the 150.100.1.1/30 over this tunnel to R3.
I haven't tried the tunnel solution yet, but I will.
Landon
----- Original Message -----
From: "Lupi, Guy" <Guy.Lupi@eurekaggn.com>
To: "'Landon Fitts '" <l.fitts@mindspring.com>; <ccielab@groupstudy.com>
Sent: Wednesday, April 03, 2002 7:55 PM
Subject: RE: OSPF to IGRP redistribution (I know this has been killed, thi s
is short I promise)
> If you look at the config I just sent, if you put the secondary on an
> interface that is not connected to the IGRP router, you can get the route
in
> there.
>
> -----Original Message-----
> From: Landon Fitts
> To: ccielab@groupstudy.com
> Sent: 4/3/2002 6:28 PM
> Subject: Re: OSPF to IGRP redistribution (I know this has been killed,
thi
> s is short I promise)
>
> It seems that although this topic has been beaten to death, it still
> gives
> some people lots of grief, including myself.
>
> I have gotten this scenario to work with the "well-known" solutions:
> using default-network in the IGRP domain, or using static routes in the
> IGRP domain. For the OSPF domain, I have used summary-address into
> the ospf domain at the asbr. However, these solutions all use some
> form of default routing, so of course we want to be able to solve this
> problem of redistribution between a classful and classless protocol
> another
> way.
>
> I tried using secondary addressing on the link between the asbr and the
> IGRP
> only router, but still have not gotten that method to work. For instance
> with Guy's
> scenario if the link between R1 and R2 was network 150.100.1.0/24, and
> you
> wanted R2 to have reachability in it's route table to a network in the
> OSPF
> domain
> that was 150.100.2.0/30, what secondary address network number would
> allow
> this to happen? I tried this using a secondary address of
> 150.100.3.0/30 as
> well as
> 192.168.1.0/30, and I still couldn't see the 150.100.2.0/30 network in
> R2's
> route
> table.
>
> I know I was long-winded here, but I would like to get this nailed down,
> and
> I can't
> find any examples on cco, doyle, etc. on how to resolve this using
> secondary addresses,
> tunnels, or route-maps.
>
> Can anyone offer some short configs so that I can try for myself.
>
> Regards,
>
> Landon Fitts
> CCNP, CCDP, NNCSE, NNCDE
> l.fitts@mindspring.com
>
>
> ----- Original Message -----
> From: "Warren J Dubose" <wdubose@cisco.com>
> To: "Lupi, Guy" <Guy.Lupi@eurekaggn.com>
> Cc: "'Mas Kato'" <loomis_towcar@speedracer.com>;
> <ccielab@groupstudy.com>
> Sent: Wednesday, April 03, 2002 5:13 PM
> Subject: RE: OSPF to IGRP redistribution (I know this has been killed,
> thi s
> is short I promise)
>
>
> > Guy,
> >
> > MAS is correct.
> >
> > How can r1 belong to 2 areas when it is connected to r1 talking IGRP?
> >
> > There are two types of summarization in ospf:
> >
> > Intra-area route summarization
> > ---- summarization can occur at two points in an OSPF network at
> > "AREA BORDERS", where ABRs can be configured to announce a single
> Summary
> > LSA for the range of networks residing within a "specific area"
> >
> > Inter-routing Domain Route Summarization
> > --- on ASBRs at "route redistribution points" where ospf routes are
> being
> > exported to another routing protocol, or non-ospf routes are being
> > imported into opsf.
> >
> > Check out Doyle's or Caslow's book pertaining to summarization of
> OSPF.
> > This should help ;)
> >
> > Regards,
> > Warren
> >
> >
> >
> > On Wed, 3 Apr 2002, Lupi, Guy wrote:
> >
> > > Right, that is what I did, R1 is a member of 2 areas, area 1 and
> area 0.
> > > Here is a partial output of "show ip ospf". This is why I don't
> understand
> > > why it isn't working. I thought that as long as the router was an
> ABR,
> you
> > > could use area range to summarize and inject into IGRP.
> > >
> > > r1#sh ip os
> > > Routing Process "ospf 100" with ID 141.63.10.1 and Domain ID
> 0.0.0.100
> > > Supports only single TOS(TOS0) routes
> > > Supports opaque LSA
> > > It is an area border and autonomous system boundary router
> > >
> > > -----Original Message-----
> > > From: Mas Kato [mailto:loomis_towcar@speedracer.com]
> > > Sent: Wednesday, April 03, 2002 4:30 PM
> > > To: Lupi, Guy
> > > Cc: ccielab@groupstudy.com
> > > Subject: RE: OSPF to IGRP redistribution (I know this has been
> killed,
> > > this is short I promise)
> > >
> > >
> > > Guy,
> > >
> > > Although router1 is certainly an ASBR, it really doesn't become an
> ABR
> until
> > > it becomes a member of two or more OSPF areas. If you hung another
> > > OSPF-speaking router off of router1 and placed it in an area
> different
> from
> > > router5, you would then see the results of your 'area range' command
> on
> that
> > > new router, because that new router would know how to read the type
> 3
> > > summary LSAs being originated by router1.
> > >
> > > Regards,
> > >
> > > Mas Kato
> > > https://ecardfile.com/id/mkato
> > >
> > > > "Lupi, Guy" <Guy.Lupi@eurekaggn.com> "'ccielab@groupstudy.com'"
> > > <ccielab@groupstudy.com>Date: Wed, 3 Apr 2002 14:44:12 -0500
> > > >Reply-To: "Lupi, Guy" <Guy.Lupi@eurekaggn.com>
> > > >
> > > >I know this has been covered in detail before, I just want to
> verify
> > > >something. I have the following:
> > > >
> > > >router2---------router1--------router5
> > > >
> > > >Router 5 and router 1 are OSPF, router 2 and router 1 is igrp only.
> I
> know
> > > >how to use the secondary address, tunnel, and route-map methods. I
> know
> > > how
> > > >to use summary address on router 1 to get connected routes that are
> not
> in
> > > >OSPF onto router 2. I cannot get routes from router 5 to router 2
> using
> > > >area range on router 1. Router 1 is an ASBR, and an ABR. I cannot
> use
> the
> > > >area range command to get the route from r5 to r2, and summary
> address
> > > would
> > > >never work, but tunnels, route-maps, and secondary addresses work.
> I
> > > >thought that if the router was an ABR, you could do "area-range
> [area
> route
> > > >is from] x.x.x.x x.x.x.x". Thanks.
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:57:53 GMT-3