From: Zukque (zukque@gmail.com)
Date: Fri Dec 23 2005 - 22:05:24 GMT-3
Brian, Sorry but I do not get it
R4>en
R4#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, 05:06:12, Ethernet0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/1065] via 183.1.0.2, 05:06:12, 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, 05:12:17, Serial0
O 183.1.0.3/32 [110/1064] via 183.1.0.2, 05:12:18, Serial0
C 183.1.0.0/24 is directly connected, Serial0
R4#show ip ospf
Routing Process "ospf 1" with ID 183.1.0.4 and Domain ID 0.0.0.1
Supports only single TOS(TOS0) routes
Supports opaque LSA
It is an area border and autonomous system boundary router
Redistributing External Routes from,
connected, includes subnets in redistribution
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 2. Checksum Sum 0x17F1B
Number of opaque AS LSA 0. Checksum Sum 0x0
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 28 times
Area ranges are
Number of LSA 8. Checksum Sum 0x44A36
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 3
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 18 times
Area ranges are
Number of LSA 13. Checksum Sum 0x5D8B5
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
R4#show ip ospf interface
Serial0 is up, line protocol is up
Internet Address 183.1.0.4/24 , Area 0
Process ID 1, Router ID 183.1.0.4, Network Type POINT_TO_MULTIPOINT, Cost:
1000
Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:03
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 2, maximum is 2
Last flood scan time is 4 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 183.1.0.2
Suppress hello for 0 neighbor(s)
Ethernet0 is up, line protocol is up
Internet Address 183.1.42.4/24, Area 3
Process ID 1, Router ID 183.1.0.4 , Network Type BROADCAST, Cost: 65
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 183.1.0.2, Interface address 183.1.42.2
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:04
Index 1/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 5
Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 183.1.0.2 (Designated Router)
Suppress hello for 0 neighbor(s)
R4#
R4#
R4#conf ter
Enter configuration commands, one per line. End with CNTL/Z.
R4(config)#interface serial 0
R4(config-if)#shutdown
R4(config-if)#^Z
R4#
R4#
3d21h: is_up: 0 state: 6 sub state: 1 line: 0
3d21h: %OSPF-5-ADJCHG: Process 1, Nbr 183.1.0.2 on Serial0 from FULL to
DOWN, Neighbor Down: Interface down or detached
3d21h: RT: interface Serial0 removed from routing table
3d21h: RT: del 183.1.0.0/24 via 0.0.0.0, connected metric [0/0]
3d21h: RT: delete subnet route to 183.1.0.0/24
3d21h: RT: delete route to 3.3.3.3 via 183.1.0.2, Serial0
3d21h: RT: no routes to 3.3.3.3 , flushing
3d21h: RT: delete network route to 3.0.0.0
3d21h: RT: delete route to 183.1.0.2 via 183.1.0.2, Serial0
3d21h: RT: no routes to 183.1.0.2, flushing
3d21h: RT: delete route to 183.1.0.3 via 183.1.0.2, Serial0
3d21h: RT: no routes to 183.1.0.3, flushing
R4#
3d21h: %SYS-5-CONFIG_I: Configured from console by console
R4#
R4#
R4#
3d21h: %LINK-5-CHANGED: Interface Serial0, changed state to administratively
down
R4#
R4#
R4#
3d21h: is_up: 0 state: 6 sub state: 1 line: 0
3d21h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
state to down
R4#
3d21h: is_up: 0 state: 6 sub state: 1 line: 0
R4#
R4#
R4#
3d21h: RT: add 3.3.3.3/32 via 183.1.42.2, ospf metric [110/130]
3d21h: RT: network 183.1.0.0 is now variably masked
3d21h: RT: add 183.1.0.2/32 via 183.1.42.2, ospf metric [110/65]
3d21h: RT: add 183.1.0.3/32 via 183.1.42.2, ospf metric [110/129]
R4#
R4#
R4#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, 00:00:04, Ethernet0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/130] via 183.1.42.2, 00:00:05, Ethernet0
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, 3 subnets, 2 masks
C 183.1.42.0/24 is directly connected, Ethernet0
O IA 183.1.0.2/32 [110/65] via 183.1.42.2, 00:00:05, Ethernet0
O IA 183.1.0.3/32 [110/129] via 183.1.42.2, 00:00:06, Ethernet0
R4#
R4#show ip int brief
Interface IP-Address OK? Method Status
Protocol
BRI0 unassigned YES unset administratively down
down
BRI0:1 unassigned YES unset administratively down
down
BRI0:2 unassigned YES unset administratively down
down
Ethernet0 183.1.42.4 YES manual up
up
Loopback0 4.4.4.4 YES manual up
up
Serial0 183.1.0.4 YES manual administratively down
down
Serial1 unassigned YES unset administratively down
down
On 12/23/05, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> Remember that all inter-area traffic must transit area 0 (an ABR). It
> doesn't matter what the cost is to reach R3's loopback which is in area 2
> across the Ethernet segment that is area 3.
>
> To reach a route in area 2 the traffic must use the area 0 path over the
> path across area 3. If you want to "transit" area 3 to reach area 2 look
> into using a virtual-link across the Ethernet or a tunnel.
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> 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 3:06 PM
> To: Brian Dennis
> Cc: Cisco certification
> Subject: Re: IP OSPF COST for IA's
>
> 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
> 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 E22.2.2.0 [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 IA3.3.3.3 [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
> 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/BDR00:00:33 183.1.42.2
> 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 E22.2.2.0 [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 E22.2.2.0 [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 RouterAge Seq# Checksum Link
> count
> 183.1.0.2 183.1.0.2 427 0x80000010 0x4A1C 3
> 183.1.0.3 183.1.0.3 14440x80000007 0xDD56 2
> 183.1.0.4 183.1.0.4 232 0x80000013 0xEE87 2
>
> Summary Net Link States (Area 0)
>
> Link ID ADV RouterAge Seq# Checksum
> 3.3.3.3 183.1.0.3 17010x80000002 0x77FB
> 183.1.42.0183.1.0.2 427 0x8000000B 0xBD69
> 183.1.42.0183.1.0.4 14800x80000009 0x4014
>
> Summary ASB Link States (Area 0)
>
> Link ID ADV RouterAge Seq# Checksum
> 183.1.0.2 183.1.0.4 19440x80000004 0xF788
> 183.1.0.4 183.1.0.2 179 0x80000004 0x65ED
>
> Router Link States (Area 3)
>
> Link ID ADV RouterAge Seq# Checksum Link
> count
> 183.1.0.2 183.1.0.2 510x8000000A 0x66CA 2
> 183.1.0.4 183.1.0.4 530x8000000B 0xB8C9 2
>
> Net Link States (Area 3)
>
> Link ID ADV RouterAge Seq# Checksum
> 183.1.42.2 183.1.0.2 510x80000001 0x1D06
> 183.1.42.4 183.1.0.4 959 0x80000005 0xEC2E
>
> Summary Net Link States (Area 3)
>
> Link ID ADV RouterAge Seq# Checksum
> 3.3.3.3 183.1.0.2 16910x80000002 0xFF34
> 3.3.3.3 183.1.0.4 228 0x80000004 0x2321
> 183.1.0.2 183.1.0.2 11940x80000004 0x853F
> 183.1.0.2 183.1.0.4 228 0x80000004 0xAD29
> 183.1.0.3 183.1.0.2 11940x80000004 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 14820x80000002 0x6959
>
> Summary ASB Link States (Area 3)
>
> Link ID ADV RouterAge 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 RouterAge 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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