From: Zukque (zukque@gmail.com)
Date: Fri Dec 23 2005 - 20:05:47 GMT-3
Thanks for your help, this is a very simple topology..sorry not good drawing
also :)
R2 is the Hub
R3 and R4 are the spokes
R4 is also conected to R2 via Ethernet
Lo0 3.3.3.3/32
!
R3 -S0-------------------------------
---------------------------------------S0-R2 -Lo0 2.2.2.2/32
R4-S0--------------------------------- |
Eth-----------------------------------Eth
R3 Lo0 belongs to area 2
R2, R3, R4 S0s are in area 0
R4 Eth to R2 Ethe si in area 3
R2 is redistributing this Lo0 in OSPF using the default type
------------------------------------------------
R2
interface Ethernet0
ip address 183.1.42.2 255.255.255.0
!
interface Serial0
ip address 183.1.0.2 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint
no frame-relay inverse-arp
frame-relay map ip 183.1.0.3 203 broadcast
frame-relay map ip 183.1.0.4 204 broadcast
!
router ospf 1
log-adjacency-changes
redistribute connected subnets route-map Lo0
network 183.1.0.0 0.0.0.255 area 0
network 183.1.42.2 0.0.0.0 area 3
!
-----------------------------------------------
R3:
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
interface Serial0
ip address 183.1.0.3 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint
frame-relay map ip 183.1.0.2 302 broadcast
frame-relay map ip 183.1.0.4 302
no frame-relay inverse-arp
router ospf 1
log-adjacency-changes
network 3.3.3.3 0.0.0.0 area 23
network 183.1.0.0 0.0.0.255 area 0
------------------------------------------
R4:
interface Loopback0
ip address 4.4.4.4 255.255.255.255
ip ospf network point-to-point
!
interface Ethernet0
ip address 183.1.42.4 255.255.255.0
ip ospf priority 0
interface Serial0
ip address 183.1.0.4 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint
ip ospf cost 1000
ip ospf priority 0
frame-relay map ip 183.1.0.2 402 broadcast
frame-relay map ip 183.1.0.3 402
no frame-relay inverse-arp
On 12/23/05, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> Can you post your configurations and a little information about the
> topology?
>
>
>
> HTH,
>
>
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
>
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> ------------------------------
>
> *From:* Zukque [mailto:zukque@gmail.com]
> *Sent:* Friday, December 23, 2005 1:37 PM
> *To:* Brian Dennis
> *Cc:* Cisco certification
> *Subject:* Re: IP OSPF COST for IA's
>
>
>
>
>
> Brain, but why to get to route 3.3.3.3 the router is choosing S0, E0 has a
> better cost
>
>
>
>
> On 12/23/05, *Brian Dennis* <bdennis@internetworkexpert.com> wrote:
>
> You have four OSPF routes in your routing table:
>
> 2.0.0.0/24 is subnetted, 1 subnets
> O E2 2.2.2.0 [110/20] via 183.1.0.2, 00:24:45, Serial0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/129] via 183.1.0.2, 00:24:45, Serial0
> O 183.1.0.2/32 [110/64] via 183.1.0.2, 00:31:22, Serial0
> O 183.1.0.3/32 [110/128] via 183.1.0.2, 00:31:24, Serial0
>
>
> You adjusted the OSPF cost on the interface to 1000:
>
> 2.0.0.0/24 is subnetted, 1 subnets
> O E2 2.2.2.0 [110/20] via 183.1.42.2, 00:01:24, Ethernet0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/1065] via 183.1.0.2, 00:01:24, Serial0
> 4.0.0.0/32 is subnetted, 1 subnets
> O 183.1.0.2/32 [110/1000] via 183.1.0.2, 00:01:24, Serial0
> O 183.1.0.3/32 [110/1064] via 183.1.0.2, 00:01:25, Serial0
>
> All of the intra and inter area routes cost have changed. The only
> route that did not change is the E2 route which as you know should not
> change.
>
> As per RFC 2328:
>
> Cost
> The link state cost of the path to the destination. For all
> paths except type 2 external paths this describes the entire
> path's cost. For Type 2 external paths, this field describes
> the cost of the portion of the path internal to the AS. This
> cost is calculated as the sum of the costs of the path's
> constituent links.
>
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Zukque
> Sent: Friday, December 23, 2005 11:50 AM
> To: Cisco certification
> Subject: IP OSPF COST for IA's
>
> Dears
>
>
> Why IA OSPF route's are not affected with the ip ospf cost command?
> Is there a preference for Intra / Inter / External Route? Please can you
> show me where I can find this in 2328
> Thanks!
>
>
>
> That is: (take a look at 3.3.3.3)
>
> R#show ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 183.1.0.2 1 FULL/ - 00:01:51 183.1.0.2
> Serial0
> 183.1.0.2 1 FULL/BDR 00:00:33 183.1.42.2
> Ethernet0
>
> R#show ip route
> 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
>
> 2.0.0.0/24 is subnetted, 1 subnets
> O E2 2.2.2.0 [110/20] via 183.1.0.2, 00:24:45, Serial0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/129] via 183.1.0.2, 00:24:45, Serial0
> 4.0.0.0/32 is subnetted, 1 subnets
> C 4.4.4.4 is directly connected, Loopback0
> 183.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> C 183.1.42.0/24 is directly connected, Ethernet0
> O 183.1.0.2/32 [110/64] via 183.1.0.2, 00:31:22, Serial0
> O 183.1.0.3/32 [110/128] via 183.1.0.2, 00:31:24, Serial0
> C 183.1.0.0/24 is directly connected, Serial0
>
> R#
> R(config)#interface s0
> R(config-if)#ip ospf cost 1000
> R(config-if)#^Z
>
> R#clear ip route *
>
> 3d16h: RT: add 183.1.42.0/24 via 0.0.0.0, connected metric [0/0]
> 3d16h: RT: add 4.4.4.4/32 via 0.0.0.0, connected metric [0/0]
> 3d16h: RT: add 183.1.0.0/24 via 0.0.0.0, connected metric [0/0]
> 3d16h: RT: network 183.1.0.0 is now variably masked
> 3d16h: RT: add 183.1.0.2/32 via 183.1.0.2, ospf metric [110/1000]
> 3d16h: RT: add 183.1.0.3/32 via 183.1.0.2, ospf metric [110/1064]
> 3d16h: RT: add 3.3.3.3/32 via 183.1.0.2, ospf metric [110/1065]
> 3d16h: RT: add 2.2.2.0/24 via 183.1.42.2, ospf metric [110/20]
>
> R#show ip route
> 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
>
> 2.0.0.0/24 is subnetted, 1 subnets
> O E2 2.2.2.0 [110/20] via 183.1.42.2, 00:01:24, Ethernet0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/1065] via 183.1.0.2, 00:01:24, Serial0
> 4.0.0.0/32 is subnetted, 1 subnets
> C 4.4.4.4 is directly connected, Loopback0
> 183.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
> C 183.1.42.0/24 is directly connected, Ethernet0
> O 183.1.0.2/32 [110/1000] via 183.1.0.2, 00:01:24, Serial0
> O 183.1.0.3/32 [110/1064] via 183.1.0.2, 00:01:25, Serial0
> C 183.1.0.0/24 is directly connected, Serial0
>
> R#show ip ospf database
>
> OSPF Router with ID (183.1.0.4) (Process ID 1)
>
> Router Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum Link
> count
> 183.1.0.2 183.1.0.2 427 0x80000010 0x4A1C 3
> 183.1.0.3 183.1.0.3 1444 0x80000007 0xDD56 2
> 183.1.0.4 183.1.0.4 232 0x80000013 0xEE87 2
>
> Summary Net Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum
> 3.3.3.3 183.1.0.3 1701 0x80000002 0x77FB
> 183.1.42.0 183.1.0.2 427 0x8000000B 0xBD69
> 183.1.42.0 183.1.0.4 1480 0x80000009 0x4014
>
> Summary ASB Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum
> 183.1.0.2 183.1.0.4 1944 0x80000004 0xF788
> 183.1.0.4 183.1.0.2 179 0x80000004 0x65ED
>
> Router Link States (Area 3)
>
> Link ID ADV Router Age Seq# Checksum Link
> count
> 183.1.0.2 183.1.0.2 51 0x8000000A 0x66CA 2
> 183.1.0.4 183.1.0.4 53 0x8000000B 0xB8C9 2
>
> Net Link States (Area 3)
>
> Link ID ADV Router Age Seq# Checksum
> 183.1.42.2 183.1.0.2 51 0x80000001 0x1D06
> 183.1.42.4 183.1.0.4 959 0x80000005 0xEC2E
>
> Summary Net Link States (Area 3)
>
> Link ID ADV Router Age Seq# Checksum
> 3.3.3.3 183.1.0.2 1691 0x80000002 0xFF34
> 3.3.3.3 183.1.0.4 228 0x80000004 0x2321
> 183.1.0.2 183.1.0.2 1194 0x80000004 0x853F
> 183.1.0.2 183.1.0.4 228 0x80000004 0xAD29
> 183.1.0.3 183.1.0.2 1194 0x80000004 0xFD85
> 183.1.0.3 183.1.0.4 228 0x80000004 0x2570
> 183.1.0.4 183.1.0.2 429 0x80000002 0xF78C
> 183.1.0.4 183.1.0.4 1482 0x80000002 0x6959
>
> Summary ASB Link States (Area 3)
>
> Link ID ADV Router Age Seq# Checksum
> 183.1.0.2 183.1.0.4 228 0x80000004 0x9F36
> 183.1.0.4 183.1.0.2 429 0x80000002 0xE999
>
> Type-5 AS External Link States
>
> Link ID ADV Router Age Seq# Checksum Tag
> 2.2.2.0 183.1.0.2 429 0x80000004 0x10CC 0
> 4.4.4.4 183.1.0.4 214 0x80000004 0x933D 0
>
> Thanks !!!!
>
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