From: Tony Olzak (aolzak@xxxxxxxxxxxxxxxxxxx)
Date: Mon Sep 25 2000 - 13:05:24 GMT-3
Kevin,
Default-network will work also, some scenarios just don't allow that
command. I figured we better find out how to do it without using static
routes or the default-network command.
Tony
----- Original Message -----
From: "Kevin Baumgartner" <kbaumgar@cisco.com>
To: <aolzak@buckeye-express.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, September 25, 2000 12:09 AM
Subject: Re: Redistributing OSPF to IGRP
> Good catch, I didn't know it would work this way.
>
> What about using this as a default-network on R2?
>
> Kevin
>
> >
> > This is a multi-part message in MIME format.
> >
> > ------=_NextPart_000_01B5_01C02682.08DEFF90
> > Content-Type: text/plain;
> > charset="iso-8859-1"
> > Content-Transfer-Encoding: quoted-printable
> >
> > All,
> >
> > Just wanted to close this topic and share my findings.
> >
> > Without using the default-network command or static routes, the only way
=
> > to redistribute OSPF into IGRP with VLSM is to use the summary-address =
> > command on the OSPF router. This route will be redistirbuted into IGRP =
> > and allow that router to communicate with the other networks. One catch
=
> > is that this summary address must have the same mask as the IGRP link =
> > that is enabled on that major network. Example:
> >
> > Router 1
> > !
> > interface Loopback1
> > ip address 172.17.59.1 255.255.255.248
> > !
> > interface Loopback2
> > ip address 172.17.59.17 255.255.255.240
> > !
> > interface Loopback3
> > ip address 172.17.59.33 255.255.255.224
> > !
> > interface Serial1
> > ip address 172.17.59.129 255.255.255.192
> > !
> > router ospf 100
> > summary-address 172.17.59.0 255.255.255.192
> > redistribute igrp 100 metric 64 subnets
> > passive-interface Serial1
> > network 172.17.59.0 0.0.0.7 area 0
> > network 172.17.59.16 0.0.0.15 area 1
> > network 172.17.59.32 0.0.0.31 area 2
> > !
> > router igrp 100
> > redistribute ospf 100 metric 64 10 255 1 1500
> > passive-interface Loopback1
> > passive-interface Loopback2
> > passive-interface Loopback3
> > network 172.17.0.0
> > !
> > ip classless
> >
> >
> > Router 2
> > !
> > interface Ethernet0
> > ip address 10.0.0.1 255.0.0.0
> > !
> > interface Serial0
> > ip address 172.17.59.130 255.255.255.192
> > clockrate 64000
> > !
> > router igrp 100
> > network 10.0.0.0
> > network 172.17.0.0
> > !
> > ip classless
> >
> > Router 1 and 2 are connected through their serial interfaces. The mask =
> > on this connection is /26, so the summary on Router 1 must have a mask =
> > of /26 also or it will not redistribute to router 2. At first I tried a
=
> > summary of 172.17.0.0 255.255.0.0 thinking that since IGRP only =
> > understood classful networks that the summary address would have to be a
=
> > class B standard mask. The route did not make it to Router 2. After =
> > skimming through Doyle's book, it reminded me how since the 172.17.0.0 =
> > network on router 2 had a mask of /26, only matching subnet masks would
=
> > redistribute from router 1.
> >
> > Tony
> >
> >
> > ------=_NextPart_000_01B5_01C02682.08DEFF90
> > Content-Type: text/html;
> > charset="iso-8859-1"
> > Content-Transfer-Encoding: quoted-printable
> >
> > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> > <HTML><HEAD>
> > <META content=3D"text/html; charset=3Diso-8859-1" =
> > http-equiv=3DContent-Type>
> > <META content=3D"MSHTML 5.00.3018.900" name=3DGENERATOR>
> > <STYLE></STYLE>
> > </HEAD>
> > <BODY bgColor=3D#ffffff>
> > <DIV><FONT face=3DArial size=3D2>All,</FONT></DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Just wanted to close this topic and =
> > share my=20
> > findings.</FONT></DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Without using the default-network =
> > command or static=20
> > routes, the only way to redistribute OSPF into IGRP with VLSM is to use
=
> > the=20
> > summary-address command on the OSPF router. This route will be =
> > redistirbuted=20
> > into IGRP and allow that router to communicate with the other networks.
=
> > One=20
> > catch is that this summary address must have the same mask as the IGRP =
> > link that=20
> > is enabled on that major network. Example:</FONT></DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Router 1</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>interface Loopback1<BR> ip address
=
> > 172.17.59.1=20
> > 255.255.255.248<BR>!<BR>interface Loopback2<BR> ip address =
> > 172.17.59.17=20
> > 255.255.255.240<BR>!<BR>interface Loopback3<BR> ip address =
> > 172.17.59.33=20
> > 255.255.255.224<BR>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>interface Serial1<BR> ip address =
> > 172.17.59.129=20
> > 255.255.255.192</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>router ospf =
> > 100<BR> summary-address=20
> > 172.17.59.0 255.255.255.192<BR> redistribute igrp 100 metric 64=20
> > subnets<BR> passive-interface Serial1<BR> network 172.17.59.0
=
> > 0.0.0.7=20
> > area 0<BR> network 172.17.59.16 0.0.0.15 area 1<BR> network=20
> > 172.17.59.32 0.0.0.31 area 2</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>router igrp 100<BR> redistribute =
> > ospf 100=20
> > metric 64 10 255 1 1500<BR> passive-interface=20
> > Loopback1<BR> passive-interface =
> > Loopback2<BR> passive-interface=20
> > Loopback3<BR> network 172.17.0.0<BR>!<BR>ip classless</FONT></DIV>
> > <DIV> </DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Router 2</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>interface Ethernet0<BR> ip address
=
> > 10.0.0.1=20
> > 255.0.0.0<BR> !<BR>interface Serial0<BR> ip address =
> > 172.17.59.130=20
> > 255.255.255.192<BR> clockrate 64000</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>!</FONT></DIV>
> > <DIV><FONT face=3DArial size=3D2>router igrp 100<BR> network=20
> > 10.0.0.0<BR> network 172.17.0.0<BR>!<BR>ip classless</FONT></DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Router 1 and 2 are connected through =
> > their serial=20
> > interfaces. The mask on this connection is /26, so the summary on Router
=
> > 1 must=20
> > have a mask of /26 also or it will not redistribute to router 2. At =
> > first I=20
> > tried a summary of 172.17.0.0 255.255.0.0 thinking that since IGRP
only=20
> > understood classful networks that the summary address would have to be a
=
> > class B=20
> > standard mask. The route did not make it to Router 2. After skimming =
> > through=20
> > Doyle's book, it reminded me how since the 172.17.0.0 network on router
=
> > 2 had a=20
> > mask of /26, only matching subnet masks would redistribute from
router=20
> > 1.</FONT></DIV>
> > <DIV> </DIV>
> > <DIV><FONT face=3DArial size=3D2>Tony</FONT></DIV>
> > <DIV> </DIV></BODY></HTML>
> >
> > ------=_NextPart_000_01B5_01C02682.08DEFF90--
> >
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