From: Katson PN Yeung (kyeung@xxxxxxxxx)
Date: Sun Dec 16 2001 - 22:29:44 GMT-3
Dear all,
I am doing bootcamp Lab5a and found this funny behaviour.
I have enabled "debug ip igrp protocol" and "debug ip igrp event" at R4 to
make the IGRP updates visualized.
With R4 config unchange, I add different "network area 0" statment with
different inverse-mask at the router ospf section.
Test 1: "network 137.20.20.10 0.0.0.0 area 0"
Test 2: "network 137.20.20.10 0.0.0.255 area 0"
Test 3: "network 137.20.20.0 0.0.0.255 area 0"
* everytime I add the network statment, I will "no" the previous entered
network/inverse-mask/area statement *
At test 2 and 3, R5 will redistribute 137.20.0.0 to IGRP, and this IGRP
update from R5 can be seen at R4 debug.
However, at test 1, when the inverse-mask becomes 0.0.0.0, the IGRP
update from R5 about 137.20.0.0 is disappear!
Can someone tell me what is the effect of OSPF network wildcard mask in
OSPF-IGRP redistribution? Or, am I missed something?
Router configurations and test results below:
All routers are running 12.0.20 IOS.
Router4
-----------------------------------------------------
router igrp 101
passive-interface Ethernet0
network 172.168.0.0
interface Serial0
ip address 172.168.200.2 255.255.255.0
encapsulation frame-relay
ip split-horizon
no ip mroute-cache
frame-relay map ip 172.168.200.1 214 broadcast
frame-relay lmi-type ansi
Router5
-----------------------------------------------------
interface Ethernet0
ip address 137.20.20.10 255.255.255.0
no ip directed-broadcast
ip ospf cost 1
ip ospf priority 200
!
interface Serial0.2 point-to-point
ip address 172.168.200.1 255.255.255.0
no ip directed-broadcast
frame-relay interface-dlci 131
!
router igrp 101
redistribute ospf 100 metric 1000 100 255 1 1500
passive-interface Serial0.1
network 172.168.0.0
!
router ospf 100
area 10 virtual-link 172.168.30.97
area 10 virtual-link 172.168.100.6
network 172.168.100.5 0.0.0.0 area 10
!
Test 1
------------------------------------------------------
When:
R5(config)#router ospf 100
R5(config-router)#network 137.20.20.10 0.0.0.0 area 0
R4#clear ip route *
R4#
Dec 15 21:54:11: IGRP: broadcasting request on Serial0
Dec 15 21:54:11: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 21:54:11: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 21:54:11: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: IGRP: Update contains 3 interior, 3 system, and 0 exterior
routes.
Dec 15 21:54:11: IGRP: Total routes in update: 6
Dec 15 21:54:11: IGRP: edition is now 73
Dec 15 21:54:11: IGRP: sending update to 255.255.255.255 via Serial0
(172.168.200.2)
Dec 15 21:54:11: subnet 172.168.40.0, metric=1100
Dec 15 21:54:11: IGRP: Update contains 1 interior, 0 system, and 0 exterior
routes.
Dec 15 21:54:11: IGRP: Total routes in update: 1
Dec 15 21:54:11: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 21:54:11: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 21:54:11: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 21:54:11: IGRP: Update contains 3 interior, 3 system, and 0 exterior
routes.
Dec 15 21:54:11: IGRP: Total routes in update: 6
R4#i
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
172.168.0.0/24 is subnetted, 5 subnets
I 172.168.30.0 [100/12100] via 172.168.200.1, 00:00:48, Serial0
C 172.168.40.0 is directly connected, Ethernet0
I 172.168.60.0 [100/12100] via 172.168.200.1, 00:00:48, Serial0
I 172.168.100.0 [100/10476] via 172.168.200.1, 00:00:48, Serial0
C 172.168.200.0 is directly connected, Serial0
I 192.168.21.0/24 [100/12100] via 172.168.200.1, 00:00:48, Serial0
I 192.168.17.0/24 [100/12100] via 172.168.200.1, 00:00:48, Serial0
I 192.168.70.0/24 [100/12100] via 172.168.200.1, 00:00:49, Serial0
Test 2
------------------------------------------------------
When:
R5(config)#router ospf 100
R5(config-router)#network 137.20.20.10 0.0.0.255 area 0
R4#clear ip route *
R4#
Dec 15 22:00:03: IGRP: broadcasting request on Serial0
Dec 15 22:00:03: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 22:00:03: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 22:00:03: network 137.20.0.0, metric 8576 (neighbor 1100)
Dec 15 22:00:03: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: IGRP: Update contains 3 interior, 4 system, and 0 exterior
routes.
Dec 15 22:00:03: IGRP: Total routes in update: 7
Dec 15 22:00:03: IGRP: edition is now 81
Dec 15 22:00:03: IGRP: sending update to 255.255.255.255 via Serial0
(172.168.200.2)
Dec 15 22:00:03: subnet 172.168.40.0, metric=1100
Dec 15 22:00:03: IGRP: Update contains 1 interior, 0 system, and 0 exterior
routes.
Dec 15 22:00:03: IGRP: Total routes in update: 1
Dec 15 22:00:03: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 22:00:03: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 22:00:03: network 137.20.0.0, metric 8576 (neighbor 1100)
Dec 15 22:00:03: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 22:00:03: IGRP: Update contains 3 interior, 4 system, and 0 exterior
routes.
Dec 15 22:00:03: IGRP: Total routes in update: 7
R4#i
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.168.200.1 to network 137.20.0.0
I* 137.20.0.0/16 [100/8576] via 172.168.200.1, 00:00:04, Serial0
172.168.0.0/24 is subnetted, 5 subnets
I 172.168.30.0 [100/12100] via 172.168.200.1, 00:00:04, Serial0
C 172.168.40.0 is directly connected, Ethernet0
I 172.168.60.0 [100/12100] via 172.168.200.1, 00:00:04, Serial0
I 172.168.100.0 [100/10476] via 172.168.200.1, 00:00:04, Serial0
C 172.168.200.0 is directly connected, Serial0
I 192.168.21.0/24 [100/12100] via 172.168.200.1, 00:00:04, Serial0
I 192.168.17.0/24 [100/12100] via 172.168.200.1, 00:00:05, Serial0
I 192.168.70.0/24 [100/12100] via 172.168.200.1, 00:00:05, Serial0
Test 3
------------------------------------------------------
When:
R5(config)#router ospf 100
R5(config-router)#network 137.20.20.0 0.0.0.255 area 0
R4#clear ip route *
R4#
Dec 15 22:02:07: IGRP: broadcasting request on Serial0
Dec 15 22:02:07: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 22:02:07: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 22:02:07: network 137.20.0.0, metric 8576 (neighbor 1100)
Dec 15 22:02:07: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: IGRP: Update contains 3 interior, 4 system, and 0 exterior
routes.
Dec 15 22:02:07: IGRP: Total routes in update: 7
Dec 15 22:02:07: IGRP: edition is now 85
Dec 15 22:02:07: IGRP: sending update to 255.255.255.255 via Serial0
(172.168.200.2)
Dec 15 22:02:07: subnet 172.168.40.0, metric=1100
Dec 15 22:02:07: IGRP: Update contains 1 interior, 0 system, and 0 exterior
routes.
Dec 15 22:02:07: IGRP: Total routes in update: 1
Dec 15 22:02:07: IGRP: received update from 172.168.200.1 on Serial0
Dec 15 22:02:07: subnet 172.168.30.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: subnet 172.168.60.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: subnet 172.168.100.0, metric 10476 (neighbor 8476)
Dec 15 22:02:07: network 137.20.0.0, metric 8576 (neighbor 1100)
Dec 15 22:02:07: network 192.168.21.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: network 192.168.17.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: network 192.168.70.0, metric 12100 (neighbor 10100)
Dec 15 22:02:07: IGRP: Update contains 3 interior, 4 system, and 0 exterior
routes.
Dec 15 22:02:07: IGRP: Total routes in update: 7
R4#i
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.168.200.1 to network 137.20.0.0
I* 137.20.0.0/16 [100/8576] via 172.168.200.1, 00:01:02, Serial0
172.168.0.0/24 is subnetted, 5 subnets
I 172.168.30.0 [100/12100] via 172.168.200.1, 00:01:02, Serial0
C 172.168.40.0 is directly connected, Ethernet0
I 172.168.60.0 [100/12100] via 172.168.200.1, 00:01:02, Serial0
I 172.168.100.0 [100/10476] via 172.168.200.1, 00:01:02, Serial0
C 172.168.200.0 is directly connected, Serial0
I 192.168.21.0/24 [100/12100] via 172.168.200.1, 00:01:02, Serial0
I 192.168.17.0/24 [100/12100] via 172.168.200.1, 00:01:03, Serial0
I 192.168.70.0/24 [100/12100] via 172.168.200.1, 00:01:03, Serial0
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