From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Mon Jan 07 2002 - 02:53:34 GMT-3
Hi,
In your case, R4 will be the asbr but no abr, you get summaration in
area 2 of two
types, ie IA and the other could be internal of area 2, further more,
the address
could be some in area 2 and area 0, ie from area 1 to 0, sound good
(142.1.32.0/21)
but address in area 0 and 2 are ?? (from 142.1.40.0/24 to
142.1.47.0/24), so you
can do address summary at R3 and R2 but not R4.
I guess you can create a seperate ospf process at R4 and selective
redistribute with
summary address.At IGRP then redistribute from this ospf process.
Parry Chua
-----Original Message-----
From: Rajeev Siddappa [mailto:raj_lab@yahoo.com]
Sent: Monday, January 07, 2002 9:41 AM
To: Bhisham Bajaj; ccielab@groupstudy.com
Subject: Re: oo! ho!!!!!! ALL about OSPF to IGRP redistribution
Bhisham,
Did u find the solution. I am also looking for the
same thing.
Thnaks,
Rajeev.
--- Bhisham Bajaj <bhishambajaj@yahoo.com> wrote:
> Yes I was wrong
>
> summary-address is used to summarize routes injected
> into OSPF
>
> for my example we would have to have a static route
> with a /20 bit mask to null 0
> and then redistribute that static route into IGRP
>
> thank u
> Bhisham
>
> --- Yu Kay <kaykkyu@yahoo.com> wrote:
> > hello,
> >
> > I confuse to use "summary-address" under ospf.
> > From cisco web site or books, they describe the
> > commnad is inject the external into ospf domain,
> but
> > your example is summarized it out to external
> > routing
> > domain.
> > Please give me some hints ?
> > thank you
> > keith
> >
> >
> > --- Bhisham Bajaj <bhishambajaj@yahoo.com> wrote:
> > > There is a mistake in my typing
> > >
> > > I have used the /16 by mistake it is /20
> > >
> > > we can summarize network 32 to 47 /24 into one
> > > network 142.1.32.0 /16
> > > Know that the 142.1.32.0/16 advertisement is of
> > the
> > > same mask that is used by IGRP
> > > The S1 interface that is in the 142.1.16.0/20
> > > network
> > > will
> > > Advertise the network 142.1.32.0/16 to router R5
>
> > >
> > > Sorry
> > > Thank u
> > >
> > > --- Bhisham Bajaj <bhishambajaj@yahoo.com>
> wrote:
> > > > There are 5 routers
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
R1----------R2-----------R3----------R4------------R5
> > > >
> > > > Area 1 Aear 0 Area 2
> > IGRP
> > > >
> > > >
> > > >
> > > > R2 is the ABR for Area 1, there are 8 networks
> > in
> > > > Area
> > > > 1
> > > >
> > > > 142.1.32.0/24 00100 000
> > > > 142.1.33.0/24 00100 001
> > > > 142.1.34.0/24 00100 010
> > > > 142.1.35.0/24 00100 011
> > > > 142.1.36.0/24 00100 100
> > > > 142.1.37.0/24 00100 101
> > > > 142.1.38.0/24 00100 110
> > > > 142.1.39.0/24 00100 111
> > > >
> > > > We can summarize these networks into one
> > network
> > > > with
> > > > the /21 mask
> > > > And inject it into the ospf Area 0
> > > > So on R2 we would use the command
> > > >
> > > > R2(config-router)# area 1 range 142.1.32.0
> > > > 255.255.248.0
> > > >
> > > > So this will summarized route into Area o for
> > > > networks
> > > > 32 to 39
> > > >
> > > > Now we have network 40 to 47 in Area 0 & Area
> 2
> > > >
> > > > 142.1.40.0/24 00101 000
> > > > 142.1.41.0/24 00101 001
> > > > 142.1.42.0/24 00101 010
> > > > 142.1.43.0/24 00101 011
> > > > 142.1.44.0/24 00101 100
> > > > 142.1.45.0/24 00101 101
> > > > 142.1.46.0/24 00101 110
> > > > 142.1.47.0/24 00101 111
> > > >
> > > >
> > > > The R4 is a router in Area 2 and is the ASBR
> it
> > > has
> > > > S0
> > > > in OSPF netork and S1 into IGRP network
> > > >
> > > > OSPF s0 s1
> IGRP
> > > >
> > >
> >
> ------------------------R4-------------------------
> > > > 142.1.47.0/24 142.1.16.0/20
> > > >
> > > >
> > > > The OSPF network is made up of 142.1.32.0 to
> > > > 142.1.47.0 /24
> > > > These routes have to be redistributed into
> IGRP
> > > > witch
> > > > has a net work 142.1.16.0/20
> > > >
> > > > The IGRP will not advertise a route with the
> > same
> > > > major network and different mask
> > > >
> > > > So we have to summarize all the ospf network
> > into
> > > > one
> > > > /20 bit network
> > > >
> > > > 142.1.32.0/24 0010 0000
> > > > 142.1.33.0/24 0010 0001
> > > > 142.1.34.0/24 0010 0010
> > > > 142.1.35.0/24 0010 0011
> > > > 142.1.36.0/24 0010 0100
> > > > 142.1.37.0/24 0010 0101
> > > > 142.1.38.0/24 0010 0110
> > > > 142.1.39.0/24 0010 0111
> > > > 142.1.40.0/24 0010 1000
> > > > 142.1.41.0/24 0010 1001
> > > > 142.1.42.0/24 0010 1010
> > > > 142.1.43.0/24 0010 1011
> > > > 142.1.44.0/24 0010 1100
> > > > 142.1.45.0/24 0010 1101
> > > > 142.1.46.0/24 0010 1110
> > > > 142.1.47.0/24 0010 1111
> > > >
> > > >
> > > > we can summarize network 32 to 47 /24 into one
> > > > network
> > > >
> > > > 142.1.32.0 /20
> > > >
> > > >
> > > > ON the ASBR that I the router R4 we will have
> to
> > > use
> > > > the
> > > > summary-address command so that when OSPF
> > > > redistributes route into IGRP
> > > > it will advertise the neworks 32 to 47 /24 as
> > > 32/20
> > > >
> > > > R4(config-router)#summary-address 142.1.32.0
> > > > 255.255.240.0
> > > >
> > > >
> > > > Know that the 142.1.32.0/20 advertisement is
> of
> > > the
> > > > same mask that is used by IGRP
> > > > The S1 interface that is in the 142.1.16.0/20
> > > > network
> > > > will
> > > > Advertise the network 142.1.32.0/20 to router
> R5
> >
> > > > And R5 will be able to reach all the OSPF
> > network
> > > > with
> > > > one route in its routing table
> > > >
> > > >
> > > >
> > > >
> > > > HTH
> > > >
> > > > Bhisham
> > > >
> > > >
> > > >
> > > >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:56:18 GMT-3