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Re: Can't filter prefix longer than 24 from OSPF to RIP posted 12/31/2007
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Hi Phuc,

Have you tried restarting the ospf process or clear ip route on SW2?

Can SW2 receive these routes from somewhere other than R1 perhaps?

Gary

----- Original Message ----- From: "nhatphuc" <nhatphuc@xxxxxxxxx>
To: "Cisco certification" <ccielab@xxxxxxxxxxxxxx>
Sent: Monday, December 31, 2007 10:08 AM
Subject: Can't filter prefix longer than 24 from OSPF to RIP



HI Group,

Please help why I can't filter prefix longer than 24 redistributed into RIP
from OSPF:


This is my config:

R1

router rip
version 2
redistribute ospf 1 metric 1 route-map OSPF->RIP
passive-interface default
no passive-interface FastEthernet0/0
network 163.1.0.0
no auto-summary
!
ip forward-protocol nd
!
ip http server
no ip http secure-server
!
ip prefix-list NOT_LONGER24 seq 5 permit 0.0.0.0/0 le 24
!
route-map OSPF->RIP permit 10
match ip address prefix-list NOT_LONGER24

DEBUG IP RIP on R1:

*Dec 31 17:42:39.209: RIP: sending v2 update to 224.0.0.9 via
FastEthernet0/0 (163.1.18.1)
*Dec 31 17:42:39.209: RIP: build update entries
*Dec 31 17:42:39.209:   10.0.0.0/8 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.2.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.3.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.4.0/23 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.4.4/32 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.5.5/32 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.6.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.7.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   150.1.8.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.0.0/25 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.0.128/25 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.3.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.4.0/24 via 0.0.0.0, metric 1, tag 0
Rack1R1#
*Dec 31 17:42:39.209:   163.1.5.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.6.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.7.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.12.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.13.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.13.3/32 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.15.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.35.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.38.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.45.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.45.5/32 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   163.1.54.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209: RIP: build update entries
*Dec 31 17:42:39.209:   163.1.57.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   192.10.1.0/24 via 0.0.0.0, metric 1, tag 0
*Dec 31 17:42:39.209:   204.12.1.0/24 via 0.0.0.0, metric 1, tag 0

SW2 still see route longer than 24 from R1 (163.1.18.1)
SW2#
R    204.12.1.0/24 [120/1] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       163.1.0.0/25 [120/4] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       163.1.6.0/24 [120/1] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       163.1.13.3/32 [120/4] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       163.1.12.0/24 [120/1] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       150.1.6.0/24 [120/4] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       150.1.3.0/24 [120/4] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       150.1.2.0/24 [120/1] via 163.1.18.1, 00:00:04, FastEthernet0/21
R       150.1.5.5/32 [120/4] via 163.1.18.1, 00:00:05, FastEthernet0/21
R       150.1.4.4/32 [120/4] via 163.1.18.1, 00:00:05, FastEthernet0/21

Thanks

Phuc

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