From: Dimitris Vassilopoulos (Dimitris.Vassilopoulos@eurodyn.com)
Date: Thu Sep 12 2002 - 07:32:45 GMT-3
Hello all,
The whole issue is about the RIP/IGRP sending and accepting routes...
Here is the topology:
R1 ------- R2 -------- R4
(rip) (rip&igrp) (igrp)
R1
!
interface Loopback0
ip address 200.0.0.1 255.255.255.255
no ip directed-broadcast
!
interface Loopback10
description SIM TOK-RING
ip address 150.50.18.1 255.255.255.0
no ip directed-broadcast
ip ospf network point-to-point
!
interface Ethernet0
ip address 150.50.200.1 255.255.255.0
no ip directed-broadcast
!
interface Serial0
ip address 150.50.17.1 255.255.255.0
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!!
router rip
redistribute connected metric 2
network 150.50.0.0
distribute-list 1 out Serial0
!
ip classless
!
access-list 1 permit 150.50.200.0 0.0.0.255
access-list 1 permit 150.50.18.0 0.0.0.255
access-list 1 permit 200.0.0.0 0.0.0.255
!
R2
!
interface Loopback0
ip address 200.0.0.2 255.255.255.255
no ip directed-broadcast
!
interface Serial0/0
ip address 150.50.17.2 255.255.255.0
no ip directed-broadcast
no ip mroute-cache
no fair-queue
clockrate 148000
!
interface Serial0/1
bandwidth 128
no ip address
no ip directed-broadcast
encapsulation frame-relay
logging event subif-link-status
logging event dlci-status-change
clockrate 2000000
no frame-relay inverse-arp
frame-relay intf-type dce
!
interface Serial0/1.24 point-to-point
ip address 150.50.24.2 255.255.255.0
no ip directed-broadcast
frame-relay interface-dlci 104
!
interface Serial0/1.256 multipoint
ip address 150.50.100.2 255.255.255.224
no ip directed-broadcast
frame-relay map ip 150.50.100.5 105 broadcast
frame-relay map ip 150.50.100.6 106 broadcast
!
router rip
redistribute connected metric 3
network 150.50.0.0
!
router igrp 10
redistribute connected metric 1000 100 1 255 1500
network 150.50.0.0
!
ip classless
!
R4
interface Loopback0
ip address 200.0.0.4 255.255.255.255
no ip directed-broadcast
!
interface Ethernet0
ip address 10.1.1.4 255.255.255.0
no ip directed-broadcast
!
interface Serial0
ip address 150.50.24.4 255.255.255.0
no ip directed-broadcast
encapsulation frame-relay
no ip mroute-cache
no fair-queue
frame-relay map ip 150.50.24.2 401 broadcast
no frame-relay inverse-arp
!
interface Serial1
no ip address
no ip directed-broadcast
shutdown
!
interface FR-ATM20
no ip address
no ip directed-broadcast
shutdown
!
router igrp 10
redistribute connected metric 100 1 225 1 1500
network 150.50.0.0
distribute-list 1 out Serial0
!
access-list 1 permit 10.0.0.0 0.255.255.255
access-list 1 permit 200.0.0.0 0.0.0.255
Looking at the routing tables, I see:
======================================================
R1#sh ip rou
.
.
Gateway of last resort is not set
200.0.0.0/32 is subnetted, 1 subnets
C 200.0.0.1 is directly connected, Loopback0
150.50.0.0/24 is subnetted, 4 subnets
C 150.50.200.0 is directly connected, Ethernet0
C 150.50.17.0 is directly connected, Serial0
C 150.50.18.0 is directly connected, Loopback10
R 150.50.24.0 [120/1] via 150.50.17.2, 00:00:27, Serial0
R1#
======================================================
R2#sh ip rou
.
.
Gateway of last resort is not set
200.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
I 200.0.0.0/24 [100/80625] via 150.50.24.4, 00:00:04, Serial0/1.24
C 200.0.0.2/32 is directly connected, Loopback0
I 10.0.0.0/8 [100/80225] via 150.50.24.4, 00:00:04, Serial0/1.24
150.50.0.0/16 is variably subnetted, 5 subnets, 2 masks
R 150.50.200.0/24 [120/1] via 150.50.17.1, 00:00:05, Serial0/0
C 150.50.17.0/24 is directly connected, Serial0/0
R 150.50.18.0/24 [120/1] via 150.50.17.1, 00:00:05, Serial0/0
C 150.50.24.0/24 is directly connected, Serial0/1.24
C 150.50.100.0/27 is directly connected, Serial0/1.256
R2#
======================================================
R4#sh ip rou
.
.
Gateway of last resort is not set
200.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
I 200.0.0.0/24 [100/8976] via 150.50.24.2, 00:01:30, Serial0
C 200.0.0.4/32 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Ethernet0
150.50.0.0/24 is subnetted, 2 subnets
I 150.50.17.0 [100/12100] via 150.50.24.2, 00:00:19, Serial0
C 150.50.24.0 is directly connected, Serial0
R4#
======================================================
My question is:
Since both R1 and R4 get an advertisement about 200.0.0.0 from R2, and
both have
loopbacks with ip addresses on 200.0.0.0, why RIP (correctly) drops the
200.0.0.0/24
route, while IGRP installs it in it's routing table?
Thanks.
Dimitris
This archive was generated by hypermail 2.1.4 : Mon Oct 07 2002 - 07:43:49 GMT-3