From: Xu, James (james.xu@xxxxxxx)
Date: Fri Aug 10 2001 - 19:23:28 GMT-3
Warren:
In your IGRP scenario, the Ethernet 0 interface has 172.16.11.0/24, so all
of the redistributed routes will be advertised out, in that they are in the
same major network, and same subnet mask.
However, in your RIP scenario, the Ethernet 0 interface has 192.168.4.0/24,
the redistributed routes are in different major network, as a reult, they
are dropped.
They are working as the way it is.
James
-----Original Message-----
From: warren perrett [mailto:warrenperrett@hotmail.com]
Sent: Friday, August 10, 2001 12:46 PM
To: james.xu@eds.com; ccielab@groupstudy.com
Subject: RE: OSPF to RIP redistribution
Yes the IGRP works just fine , the out going interface is a /24 bit mask ,
ALL my interfaces are. I know about the classfull and classless issues but I
am confused why IGRp and RIP are acting differently. :(
Heres some more info
ROUTER redist OSPF to IGRP
I#sh ip route 172.16.0.0
Routing entry for 172.16.0.0/16, 8 known subnets
Attached (1 connections)
Variably subnetted with 2 masks
Redistributing via ospf 1, igrp 1
Advertised by igrp 1
sh ip route 172.16.0.0
O IA 172.16.8.0/24 [110/3358] via 172.16.9.1, 00:00:51, Serial1
C 172.16.9.0/24 is directly connected, Serial1
O 172.16.10.1/32 [110/1563] via 172.16.9.1, 00:00:51, Serial1
O IA 172.16.4.0/24 [110/1582] via 172.16.9.1, 00:00:51, Serial1
O IA 172.16.7.0/24 [110/3357] via 172.16.9.1, 00:00:51, Serial1
O IA 172.16.1.1/32 [110/1573] via 172.16.9.1, 00:00:51, Serial1
O IA 172.16.2.0/24 [110/1572] via 172.16.9.1, 00:00:51, Serial1
O IA 172.16.3.0/24 [110/1572] via 172.16.9.1, 00:00:51, Serial1
debug
IGRP: sending update to 255.255.255.255 via Ethernet0 (172.16.11.1)
subnet 172.16.8.0, metric=10010
subnet 172.16.9.0, metric=158250
subnet 172.16.4.0, metric=10010
subnet 172.16.7.0, metric=10010
subnet 172.16.2.0, metric=10010
subnet 172.16.3.0, metric=10010
config to do this, simple enough really is :
router ospf 1
redistribute igrp 1 metric 1 metric-type 1 subnets
network 172.16.9.2 0.0.0.0 area 2
network 200.200.200.9 0.0.0.0 area 2
!
router igrp 1
redistribute ospf 1 metric 1000 10 255 1 1500
passive-interface Serial1
network 172.16.0.0
This outgoing interface has a /24 bit mask
Ethernet0 172.16.11.1 YES manual up up
Change this to RIP and it all stops working as below.
A point of note if I redisrtibute from EIGRP the symptoms are the same .
I set out on purpose to make my life easy by having all links and networks
with a 24 bit mask with the idea of getting the nework upo and pingable and
then introducing VLSM and fixing the issues that arose. Hmmmmmm now I
question my sanity.......
I started the day confident I could do redistribution , now I want to boil
my head :(
Thanks for the help...............
>From: "Xu, James"
>Reply-To: "Xu, James"
>To: "'warren perrett'" , ccielab@groupstudy.com
>Subject: RE: OSPF to RIP redistribution
>Date: Fri, 10 Aug 2001 12:03:13 -0400
>
>The rip v.1 and IGRP are classful routing protocols. They will check the
>outgoing routes against the network configured in the outgoing interfaces.
>The logic is as the follows:
>
> If (the outgoing routes is in the different major network from that
>configured in the interface)
> summarize the routes to major network boundary and advertise out.
> else (if the outgoing routes have the same subnet masks)
> advertise the routes out
> else
> drop the routes.
>
>A couple of days ago, some post a link to "rip and igrp routing technical
>notes", which should be very helpful.
>
>However, this should happens with your advertisement in IGRP too, are you
>sure it works?
>
>James Xu
>
>-----Original Message-----
>From: warren perrett [mailto:warrenperrett@hotmail.com]
>Sent: Friday, August 10, 2001 10:57 AM
>To: ccielab@groupstudy.com
>Subject: OSPF to RIP redistribution
>
>
>Why ?
>
>If I use OSPF to IGRP then all the subnet info is advertised .
>
>Below are the relevant parts of my configs and some debug outputs.
>
>Any thoughts ?
>
>
>
>Router with leg in OSPF and RIP
>
>router ospf 1
>
>redistribute rip metric 10 metric-type 1 subnets
>
>network 10.10.10.3 0.0.0.0 area 0
>
>network 192.168.6.1 0.0.0.0 area 3
>
>network 200.200.200.3 0.0.0.0 area 3
>
>!
>
>router rip
>
>redistribute ospf 1 metric 1
>
>network 192.168.4.0
>
>no auto-summary
>
>!
>
>C#sh ip route 172.16.0.0
>
>Routing entry for 172.16.0.0/16, 11 known subnets
>
>Variably subnetted with 3 masks
>
>Redistributing via ospf 1, rip
>
>Advertised by rip metric 1
>
>O IA 172.16.8.0/24 [110/1670] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.9.0/24 [110/3124] via 10.10.10.4, 00:01:05, Serial0
>
>O E1 172.16.11.0/24 [110/3125] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.10.1/32 [110/1563] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.4.0/24 [110/1582] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.5.0/24 [110/1669] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.6.0/24 [110/1669] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.1.1/32 [110/1563] via 10.10.10.1, 00:01:05, Serial0
>
>O IA 172.16.2.0/24 [110/1572] via 10.10.10.1, 00:01:05, Serial0
>
>[110/1572] via 10.10.10.4, 00:01:05, Serial0
>
>O IA 172.16.3.0/24 [110/1572] via 10.10.10.4, 00:01:05, Serial0
>
>
>
>The routes above are the ones I want to pass out , BUT look below it wont
>do it !
>
>DEBUG IP RIP
>
>RIP: sending v1 update to 255.255.255.255 via Ethernet0 (192.168.4.3)
>
>network 172.16.0.0, metric 1
>
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>
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