From: Kevin Baumgartner (kbaumgar@xxxxxxxxx)
Date: Mon Sep 25 2000 - 13:43:51 GMT-3
I tried your setup and used the network that was sent to R2 as
the default-network. It didn't work. Not really suprised as this
is not a classful network.
But your solution of how to redistribute non-classful (subnetted)
routes into IGRP is very good.
Kevin
At 12:05 PM 9/25/00 -0400, you wrote:
>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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