From: Kevin Baumgartner (kbaumgar@xxxxxxxxx)
Date: Mon Sep 25 2000 - 01:09:58 GMT-3
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--
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:25:01 GMT-3