From: Engelhard M. Labiro (engelhard@xxxxxxxxxxxxxx)
Date: Sun Mar 24 2002 - 08:32:13 GMT-3
Hi Atul,
You should assign the cost on an interface where it
first receives a route to the network that you want to influence
its path cost.
As in your scenario, r1`s path to 153.1.43.0/25 is through interface
Ethernet 0 , so to change the cost learned by r3, assign it on
r1`s Ethernet 0 interface, not on r1`s Serial 0.
----- Original Message -----
From: "atul pawar" <atulpawar@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, March 24, 2002 8:03 AM
Subject: ospf problem
> Hi Guyes
> I my scenario I have two equal cost OSPF paths to the network
153.1.43.0/25
> on r3 via r1 and r2 . I am trying to force OSPF to choose one of them as
> preferred route. To influence the path selection I am using "ip ospf cost
> 71" on one router i.e r1 . As per my understanding this should make this
> router less preferable but somehow this is not working and on the router
r3
> I can still see two routes i.e form r1 and r2 . I am posting the config
and
> routing table. Please le me know if I am missing something simple. Any
help
> would be appreciated.
> Cheers
> Atul
>
> r1#sh run
> Building configuration...
>
> Current configuration:
> !
> version 11.2
> no service password-encryption
> no service udp-small-servers
> no service tcp-small-servers
> !
> hostname r1
> !
> !
> no ip domain-lookup
> !
> interface Loopback1
> ip address 153.1.101.1 255.255.255.0
> !
> interface Loopback10
> ip address 12.2.3.2 255.255.0.0
> !
> interface Ethernet0
> ip address 153.1.43.33 255.255.255.128
> bridge-group 1
> !
> interface Serial0
> ip address 153.1.200.3 255.255.255.0
> encapsulation frame-relay
> ip ospf cost 71
> ip ospf priority 0
> bandwidth 64000
> frame-relay map bridge 103 broadcast
> frame-relay map ip 153.1.200.1 103 broadcast
> frame-relay map ip 153.1.200.2 103 broadcast
> frame-relay map ip 153.1.200.4 103 broadcast
> bridge-group 1
> !
> interface Serial1
> ip address 153.1.53.67 255.255.255.224
> clockrate 64000
> !
> router ospf 100
> network 153.1.200.3 0.0.0.0 area 0
> network 153.1.101.1 0.0.0.0 area 0
> network 153.1.43.33 0.0.0.0 area 1
> network 153.1.53.67 0.0.0.0 area 51
> !
> no ip classless
> !
> bridge 1 protocol ieee
> !
> line con 0
> exec-timeout 0 0
> logging synchronous
> line aux 0
> line vty 0 4
> login
> !
> end
>
> r3#sh ip rou
> 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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 153.1.0.0/16 is variably subnetted, 7 subnets, 4 masks
> C 153.1.200.0/24 is directly connected, Serial0
> O IA 153.1.43.0/25 [110/74] via 153.1.200.3, 00:18:42, Serial0
> [110/74] via 153.1.200.4, 00:18:42, Serial0
> O IA 153.1.53.64/27 [110/128] via 153.1.200.3, 00:18:42, Serial0
> O 153.1.105.5/32 [110/65] via 153.1.200.1, 00:18:42, Serial0
> O 153.1.102.2/32 [110/65] via 153.1.200.4, 00:18:42, Serial0
> O 153.1.101.1/32 [110/65] via 153.1.200.3, 00:18:42, Serial0
> C 153.1.103.0/24 is directly connected, Loopback1
> 186.1.0.0/24 is subnetted, 1 subnets
> O IA 186.1.1.0 [110/74] via 153.1.200.1, 00:18:42, Serial0
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