Multi-Area OSPF Labs
Multi-Area OSPF 1Lo - RouterID192.168.2.1/32.1.2ABR-1Lo - RouterID192.168.1.1/32.3Pri 200Pri 100ABR-2.5Lo - rea 51Area 0/24Area 1Labs1.2.3.4.5.OSPF Normal AreasOSPF Stub AreaOSPF Totally Stubby AreaOSPF SPF CalculationOSPF Default RouteLo - RouterID192.168.4.1/32
Notes:Instructors: Although there are some explanation contained in this lab, it is designed tocoincide with the Multi-area OSPF PowerPoint lesson. The information in the PowerPointexplains much of the information and output in this lab. If you need access to thisPowerPoint, please email me at graziani@cabrillo.edu.Verification commands used in this lab:show ip ospfshow ip ospf neighborshow ip ospf datashow ip ospf bordershow ip ospf routeA command that was not included, but is highly recommended, is show ip ospfinterface.Equipment used:ASBR: Cisco 2622ABR-1: Cisco 2621ABR-2: Cisco 1720Internal: Cisco 1720Notes:Loopback1 is used to simulate 172.16.51.1/24 interface.Interfaces with clock rate may vary upon your configuration.I would suggest using the following commands to keep debug information frominterfering with other output and to keep the router from timing out.line con 0logging synchronousexec-timeout 0 0
Lab 1: OSPF Normal AreasObjectiveIn this lab, students will configure a multiarea OSPF operation. There are no default routes on the ASBR.Students will learn how to configure routers for multiarea OSPF. Students will also become familiar with theoutput associated with show ip ospf database and other commands, knowing what they should expect to seewhen the routers are properly configured.Router ConfigsASBRCurrent configuration:version 12.0!hostname ASBR!interface Loopback0ip address 192.168.1.1 255.255.255.255!interface FastEthernet0/0ip address 172.16.1.1 255.255.255.0!interface FastEthernet0/1ip address 10.1.0.1 255.255.255.0!router ospf 1redistribute staticnetwork 172.16.1.0 0.0.0.255 area 0!ip classlessip route 11.0.0.0 255.0.0.0 Null0ip route 12.0.0.0 255.0.0.0 Null0ip route 13.0.0.0 255.0.0.0 Null0!ABR-1Current configuration:version 12.0!hostname ABR-1!interface Loopback0ip address 192.168.2.1 255.255.255.255!interface Loopback1ip address 172.16.51.1 255.255.255.0!interface FastEthernet0/0ip address 172.16.1.2 255.255.255.0ip ospf priority 200!router ospf 1network 172.16.1.0 0.0.0.255 area 0network 172.16.51.0 0.0.0.255 area 51!ip classless!
ABR-2Current configuration:version 12.0!hostname ABR-2!interface Loopback1ip address 192.168.3.1 255.255.255.255!interface Serial0ip address 172.16.10.5 255.255.255.252!interface FastEthernet0ip address 172.16.1.3 255.255.255.0ip ospf priority 100!router ospf 1network 172.16.1.0 0.0.0.255 area 0network 172.16.10.4 0.0.0.3 area 1!ip classless!InternalCurrent configuration:version 12.0!hostname Internal!interface Loopback0ip address 192.168.4.1 255.255.255.255!interface Serial0ip address 172.16.10.6 255.255.255.252clockrate 64000!interface FastEthernet0ip address 172.16.20.1 255.255.255.0!router ospf 1network 172.16.0.0 0.0.255.255 area 1!ip classless!
ASBR: Normal Area OutputsASBR#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/2] via 172.16.1.2, 00:02:54, FastEthernet0/0172.16.20.0/24 [110/783] via 172.16.1.3, 00:02:54, FastEthernet0/0172.16.10.4/30 [110/782] via 172.16.1.3, 00:02:54, FastEthernet0/0172.16.1.0/24 is directly connected, FastEthernet0/010.0.0.0/24 is subnetted, 1 subnetsC10.1.0.0 is directly connected, FastEthernet0/1S11.0.0.0/8 is directly connected, Null0S12.0.0.0/8 is directly connected, Null0192.168.1.0/32 is subnetted, 1 subnetsC192.168.1.1 is directly connected, Loopback0S13.0.0.0/8 is directly connected, Null0ASBR#O IAO IAO IACNotice which routes are OSPF inter area routes.The three static routes are redistributed to other routers via the ASBR using the command:router ospf 1redistribute statico This command is discussed later in the chapter on Route Optimization.LSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)
ASBR#show ip ospf neiNeighbor /DRDead erfaceFastEthernet0/0FastEthernet0/0Notice that the router with the highest ip ospf priority is the DR and the second highest is the BDR.ASBR#show ip ospfRouting Process "ospf 1" with ID 192.168.1.1Supports only single TOS(TOS0) routesIt is an autonomous system boundary routerRedistributing External Routes from,staticSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x97E3Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 1. 1 normal 0 stub 0 nssaExternal flood list length 0Area BACKBONE(0)Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 36 timesArea ranges areNumber of LSA 8. Checksum Sum 0x507DBNumber of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Besides the information this command provides that we saw in single area OSPF, this command alsoincludes information regarding:o The type of router it is.o If any routes are being redistributed by this router.o Number of areas in this router, including number of normal, stub and nssa areas.o Specific OSPF information per area.ASBR#show ip ospf borderOSPF Process 1 internal Routing TableCodes: i - Intra-area route, I - Inter-area routei 192.168.2.1 [1] via 172.16.1.2, FastEthernet0/0, ABR, Area 0, SPF 36i 192.168.3.1 [1] via 172.16.1.3, FastEthernet0/0, ABR, Area 0, SPF 36ASBR#oThis command will displays any ABRs in the area or any ASBRs in the OSPF routing domain.
ASBR: Normal Area OutputsASBR#show ip ospf dataOSPF Router with ID (192.168.1.1) (Process ID 1)Router Link States (Area 0)Link ID172.16.10.5192.168.1.1192.168.2.1192.168.3.1ADV x80000005Checksum0x6F9C0x8D3D0x7E460x9C36Link count1111Net Link States (Area 0)Link ID172.16.1.2ADV Router192.168.2.1Age201Seq#Checksum0x8000000D 0xCFE8Summary Net Link States (Area 0)Link ID172.16.10.4172.16.20.0172.16.51.1ADV sum0x3FEA0x32F60x2503Type-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0ASBR#ADV 9Tag000Understanding the output: (Use the information below when viewing output for show ip ospf database outputfrom the other routers and with the other labs.)Router Link States (LSA 1)o Router Link States (LSA1’s) should display all the RouterIDs of routers in that area, including itsown.o Link State ID is always the same as the Advertising Router.o ADV Router is the Router ID of the router that created this LSA 1.Net Link States (LSA 2)o Net Link States (LSA2’s) should display the RouterIDs of the DRs on all multi-access networksin the area and their IP addresses.o Link ID is the IP address of DR on MultiAccess Network.o ADV Router is the Router ID of the DR.Summary Link States (LSA 3)o Should see networks in other areas and the ABR advertising that route.o Link ID is the IP network addresses of networks in other areaso ADV Router is the ABR Router ID sending the LSA-3.Summary ASB Link States (LSA 4)o Routers in non-area 0, should see Router ID of ASBR and its ABR to get there.o Link ID is the Router ID of ASBRo ADV Router is the Router ID of the ABR advertising routeType-5 AS External Link States (LSA 5)o All Routers should see External networks and the Router ID of ASBR to get thereo Link ID is the External Networko ADV Router is the Router ID of ASBR advertising the LSA 5.
ABR-1: Normal Area OutputsABR-1#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP text omitted Gateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks172.16.51.0/24 is directly connected, Loopback1IA172.16.20.0/24 [110/783] via 172.16.1.3, 00:08:17, FastEthernet0/0IA172.16.10.4/30 [110/782] via 172.16.1.3, 00:08:17, FastEthernet0/0172.16.1.0/24 is directly connected, FastEthernet0/0E2 11.0.0.0/8 [110/20] via 172.16.1.1, 00:08:17, FastEthernet0/0E2 12.0.0.0/8 [110/20] via 172.16.1.1, 00:08:17, FastEthernet0/0E2 13.0.0.0/8 [110/20] via 172.16.1.1, 00:08:17, FastEthernet0/0192.168.2.0/32 is subnetted, 1 subnetsC192.168.2.1 is directly connected, Loopback0ABR-1#COOCOOONotice the external routes, received from the ASBR.LSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)ABR-1#show ip ospf neiNeighbor FULL/DROTHERDead erfaceFastEthernet0/0FastEthernet0/0
ABR-1#show ip ospfRouting Process "ospf 1" with ID 192.168.2.1Supports only single TOS(TOS0) routesIt is an area border routerSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x97E3Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 2. 2 normal 0 stub 0 nssaExternal flood list length 0Area BACKBONE(0)Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 38 timesArea ranges areNumber of LSA 11. Checksum Sum 0x752B2Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Area 51Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 17 timesArea ranges areNumber of LSA 5. Checksum Sum 0x32392Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0ABR-1#oNotice the information for multiple areas for this ABR.ABR-1#show ip ospf borderOSPF Process 1 internal Routing TableCodes: i - Intra-area route, I - Inter-area routei 192.168.1.1 [1] via 172.16.1.1, FastEthernet0/0, ASBR, Area 0, SPF 38i 192.168.3.1 [1] via 172.16.1.3, FastEthernet0/0, ABR, Area 0, SPF 38ABR-1#oThis command will displays any ABRs in the area or any ASBRs in the OSPF routing domain.
ABR-1: Normal Area OutputsABR-1#show ip ospf dataOSPF Router with ID (192.168.2.1) (Process ID 1)Router Link States (Area 0)Link ID172.16.10.5192.168.1.1192.168.2.1192.168.3.1ADV x80000005Checksum0x6F9C0x8D3D0x7E460x9C36Link count1111Net Link States (Area 0)Link ID172.16.1.2ADV Router192.168.2.1Age539Seq#Checksum0x8000000D 0xCFE8Summary Net Link States (Area 0)Link ID172.16.10.4172.16.20.0172.16.51.1ADV xA7460xA832Router Link States (Area 51)Link ID192.168.2.1ADV Router192.168.2.1Age585Seq#Checksum Link count0x8000000B 0x8551Summary Net Link States (Area 51)Link ID172.16.1.0172.16.10.4172.16.20.0ADV xE2150xB835Summary ASB Link States (Area 51)Link ID192.168.1.1ADV Router192.168.2.1Age531Seq#Checksum0x80000001 0x9EC4Type-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0ABR-1#ooADV x32F60x2503Tag000Notice the output for multiple areas.LSA 5s(Type-5 AS External Link States) are not listed per area, but one set per router.
ABR-2: Normal Area OutputsABR-2#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP text omitted Gateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/2] via 172.16.1.2, 00:11:44, FastEthernet0172.16.20.0/24 [110/782] via 172.16.10.6, 00:12:29, Serial0172.16.10.4/30 is directly connected, Serial0172.16.1.0/24 is directly connected, FastEthernet0E2 11.0.0.0/8 [110/20] via 172.16.1.1, 00:11:44, FastEthernet0E2 12.0.0.0/8 [110/20] via 172.16.1.1, 00:11:44, FastEthernet0E2 13.0.0.0/8 [110/20] via 172.16.1.1, 00:11:44, FastEthernet0192.168.3.0/32 is subnetted, 1 subnetsC192.168.3.1 is directly connected, Loopback1ABR-2#OOCCOOOIALSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)ABR-2#show ip ospf neiNeighbor tateFULL/DROTHERFULL/DRFULL/ -Dead 0Serial0
ABR-2#show ip ospfRouting Process "ospf 1" with ID 192.168.3.1Supports only single TOS(TOS0) routesIt is an area border routerSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x97E3Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 2. 2 normal 0 stub 0 nssaExternal flood list length 0Area BACKBONE(0)Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 8 timesArea ranges areNumber of LSA 8. Checksum Sum 0x507DBNumber of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Area 1Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 5 timesArea ranges areNumber of LSA 5. Checksum Sum 0x3E5C8Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0
ABR-2: Normal Area OutputsABR-2#show ip ospf dataOSPF Router with ID (192.168.3.1) (Process ID 1)Router Link States (Area 0)Link ID172.16.10.5192.168.1.1192.168.2.1192.168.3.1ADV x80000005Checksum0x6F9C0x8D3D0x7E460x9C36Link count1111Net Link States (Area 0)Link ID172.16.1.2ADV Router192.168.2.1Age743Seq#Checksum0x8000000D 0xCFE8Summary Net Link States (Area 0)Link ID172.16.10.4172.16.20.0172.16.51.1ADV xA7460xA832Router Link States (Area 1)Link ID192.168.3.1192.168.4.1ADV Router192.168.3.1192.168.4.1Age786828Seq#Checksum Link count0x80000003 0xCE5620x80000003 0xFD443Summary Net Link States (Area 1)Link ID172.16.1.0172.16.51.1ADV x80000005 0xD3390x80000001 0xB329Summary ASB Link States (Area 1)Link ID192.168.1.1ADV Router192.168.3.1Age801Seq#Checksum0x80000003 0x93CCType-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0ABR-2#ADV EA0x32F60x2503Tag000ABR-2#show ip ospf borderOSPF Process 1 internal Routing TableCodes: i - Intra-area route, I - Inter-area routei 192.168.1.1 [1] via 172.16.1.1, FastEthernet0, ASBR, Area 0, SPF 8i 192.168.2.1 [1] via 172.16.1.2, FastEthernet0, ABR, Area 0, SPF 8ABR-2#oThis command will displays any ABRs in the area or any ASBRs in the OSPF routing domain.
Internal: Normal Area OutputsInternal#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/783] via 172.16.10.5, 00:13:48, Serial0172.16.20.0/24 is directly connected, FastEthernet0172.16.10.4/30 is directly connected, Serial0172.16.1.0/24 [110/782] via 172.16.10.5, 00:13:53, Serial0192.168.4.0/32 is subnetted, 1 subnetsC192.168.4.1 is directly connected, Loopback0O E2 11.0.0.0/8 [110/20] via 172.16.10.5, 00:14:41, Serial0O E2 12.0.0.0/8 [110/20] via 172.16.10.5, 00:14:41, Serial0O E2 13.0.0.0/8 [110/20] via 172.16.10.5, 00:14:42, Serial0Internal#O IACCO IALSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)Internal#show ip ospf neiNeighbor ID192.168.3.1Internal#Pri1StateFULL/-Dead Time00:00:39Address172.16.10.5Internal#show ip ospfRouting Process "ospf 1" with ID 192.168.4.1Supports only single TOS(TOS0) routesSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x97E3Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 1. 1 normal 0 stub 0 nssaExternal flood list length 0Area 1Number of interfaces in this area is 2Area has no authenticationSPF algorithm executed 5 timesArea ranges areNumber of LSA 5. Checksum Sum 0x3E5C8Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Internal#InterfaceSerial0
Internal: Normal Area OutputsInternal#show ip ospf dataOSPF Router with ID (192.168.4.1) (Process ID 1)Router Link States (Area 1)Link ID192.168.3.1192.168.4.1ADV Router192.168.3.1192.168.4.1Age898937Seq#Checksum Link count0x80000003 0xCE5620x80000003 0xFD443Summary Net Link States (Area 1)Link ID172.16.1.0172.16.51.1ADV x80000005 0xD3390x80000001 0xB329Summary ASB Link States (Area 1)Link ID192.168.1.1ADV Router192.168.3.1Age912Seq#Checksum0x80000003 0x93CCType-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0Internal#ADV EA0x32F60x2503Tag000Internal#show ip ospf borderOSPF Process 1 internal Routing TableCodes: i - Intra-area route, I - Inter-area routeI 192.168.1.1 [782] via 172.16.10.5, Serial0, ASBR, Area 1, SPF 5i 192.168.3.1 [781] via 172.16.10.5, Serial0, ABR, Area 1, SPF 5Internal#oThis command will displays any ABRs in the area or any ASBRs in the OSPF routing domain.
Lab 2: OSPF Stub Area 1No default route on ASBRNo default-information originate on 1Lo - RouterID192.168.2.1/32.1Lo - RouterID192.168.1.1/32.2ABR-1.3Pri 200Pri 100ABR-2.5Lo - RouterID192.168.3.1/32172.16.1.0/24Area 0172.16.51.0/24Area .0/24Area 1Changes in configsABR-2 (Add this command)router ospf 1network 172.16.1.0 0.0.0.255 area 0network 172.16.10.4 0.0.0.3 area 1area 1 stub!Internal (Add this command)router ospf 1network 172.16.0.0 0.0.255.255 area 1area 1 stub!Changes in outputs follow Lo - RouterID192.168.4.1/32
ABR-2:Area 1 StubABR-2#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/2] via 172.16.1.2, 00:01:59, FastEthernet0172.16.20.0/24 [110/782] via 172.16.10.6, 00:01:59, Serial0172.16.10.4/30 is directly connected, Serial0172.16.1.0/24 is directly connected, FastEthernet0E2 11.0.0.0/8 [110/20] via 172.16.1.1, 00:01:59, FastEthernet0E2 12.0.0.0/8 [110/20] via 172.16.1.1, 00:01:59, FastEthernet0E2 13.0.0.0/8 [110/20] via 172.16.1.1, 00:01:59, FastEthernet0192.168.3.0/32 is subnetted, 1 subnetsC192.168.3.1 is directly connected, Loopback1ABR-2#OOCCOOOIALSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)ABR-2#show ip ospfRouting Process "ospf 1" with ID 192.168.3.1Supports only single TOS(TOS0) routesIt is an area border routerSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x97E3Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 2. 1 normal 1 stub 0 nssaExternal flood list length 0Area BACKBONE(0)Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 9 timesArea ranges areNumber of LSA 8. Checksum Sum 0x507DBNumber of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Area 1Number of interfaces in this area is 1It is a stub areagenerates stub default route with cost 1Area has no authenticationSPF algorithm executed 8 timesArea ranges areNumber of LSA 5. Checksum Sum 0x348D8Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0
ABR-2:Area 1 StubABR-2#show ip ospf dataOSPF Router with ID (192.168.3.1) (Process ID 1)Router Link States (Area 0)Link ID172.16.10.5192.168.1.1192.168.2.1192.168.3.1ADV 0160x80000005Checksum0x6F9C0x8D3D0x7E460x9C36Link count1111Net Link States (Area 0)Link ID172.16.1.2ADV Router192.168.2.1Age1397Seq#Checksum0x8000000D 0xCFE8Summary Net Link States (Area 0)Link ID172.16.10.4172.16.20.0172.16.51.1ADV 60xA7460xA832Router Link States (Area 1)Link ID192.168.3.1192.168.4.1ADV Router192.168.3.1192.168.4.1Age144144Seq#Checksum Link count0x80000005 0xE83C20x80000005 0x182A3Summary Net Link States (Area 1)Link ID0.0.0.0172.16.1.0172.16.51.1ADV sum0x3FEA0x32F60x2503Type-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0ABR-2#ADV 1846Tag000
Internal:Area 1 StubInternal#show ip ospf dataOSPF Router with ID (192.168.4.1) (Process ID 1)Router Link States (Area 1)Link ID192.168.3.1192.168.4.1ADV Router192.168.3.1192.168.4.1Age211209Seq#Checksum Link count0x80000005 0xE83C20x80000005 0x182A3Summary Net Link States (Area 1)Link ID0.0.0.0172.16.1.0172.16.51.1Internal#oADV xEF1E0xCF0ENotice there are no External LSA 5s, only the LSA 3’s including one for a default route injected by theABR.Internal#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is 172.16.10.5 to network 0.0.0.0172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/783] via 172.16.10.5, 00:03:08, Serial0172.16.20.0/24 is directly connected, FastEthernet0172.16.10.4/30 is directly connected, Serial0172.16.1.0/24 [110/782] via 172.16.10.5, 00:03:08, Serial0192.168.4.0/32 is subnetted, 1 subnetsC192.168.4.1 is directly connected, Loopback0O*IA 0.0.0.0/0 [110/782] via 172.16.10.5, 00:03:08, Serial0Internal#O IACCO IANotice there are no External routes, only a default route injected by the ABR.LSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)
Internal:Area 1 StubInternal#show ip ospfRouting Process "ospf 1" with ID 192.168.4.1Supports only single TOS(TOS0) routesSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 0. Checksum Sum 0x0Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 1. 0 normal 1 stub 0 nssaExternal flood list length 0Area 1Number of interfaces in this area is 2It is a stub areaArea has no authenticationSPF algorithm executed 7 timesArea ranges areNumber of LSA 5. Checksum Sum 0x348D8Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Internal#
Lab 3: OSPF Totally Stubby Area 1No default route on ASBRNo default-information originate on 1Lo - RouterID192.168.2.1/32.1Lo - RouterID192.168.1.1/32.2.3Pri 200ABR-1Pri 100ABR-2.5Lo - RouterID192.168.3.1/32172.16.1.0/24Area 0172.16.51.0/24Area .0/24Area 1Changes in configsABR-2 (Modify the previous command)router ospf 1network 172.16.1.0 0.0.0.255 area 0network 172.16.10.4 0.0.0.3 area 1area 1 stub no-summary!Internal (No Change)router ospf 1network 172.16.0.0 0.0.255.255 area 1area 1 stub!Changes in outputs follow Lo - RouterID192.168.4.1/32
ABR-2:Area 1 Totally StubbyABR-2#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks172.16.51.1/32 [110/2] via 172.16.1.2, 00:02:35, FastEthernet0172.16.20.0/24 [110/782] via 172.16.10.6, 00:02:35, Serial0172.16.10.4/30 is directly connected, Serial0172.16.1.0/24 is directly connected, FastEthernet0E2 11.0.0.0/8 [110/20] via 172.16.1.1, 00:02:35, FastEthernet0E2 12.0.0.0/8 [110/20] via 172.16.1.1, 00:02:35, FastEthernet0E2 13.0.0.0/8 [110/20] via 172.16.1.1, 00:02:35, FastEthernet0192.168.3.0/32 is subnetted, 1 subnetsC192.168.3.1 is directly connected, Loopback1ABR-2#OOCCOOOIALSA 1 and LSA 2: Denoted by “O” or “C”LSA 3: Denoted by “IA”LSA 5: Denoted by “E1” or “E2” (default)ABR-2#show ip ospfRouting Process "ospf 1" with ID 192.168.3.1Supports only single TOS(TOS0) routesIt is an area border routerSPF schedule delay 5 secs, Hold time between two SPFs 10 secsMinimum LSA interval 5 secs. Minimum LSA arrival 1 secsNumber of external LSA 3. Checksum Sum 0x91E6Number of DCbitless external LSA 0Number of DoNotAge external LSA 0Number of areas in this router is 2. 1 normal 1 stub 0 nssaExternal flood list length 0Area BACKBONE(0)Number of interfaces in this area is 1Area has no authenticationSPF algorithm executed 10 timesArea ranges areNumber of LSA 8. Checksum Sum 0x4FFDFNumber of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0Area 1Number of interfaces in this area is 1It is a stub area, no summary LSA in this areagenerates stub default route with cost 1Area has no authenticationSPF algorithm executed 10 timesArea ranges areNumber of LSA 3. Checksum Sum 0x182B0Number of DCbitless LSA 0Number of indication LSA 0Number of DoNotAge LSA 0Flood list length 0
ABR-2:Area 1 Totally StubbyABR-2#show ip ospf dataOSPF Router with ID (192.168.3.1) (Process ID 1)Router Link States (Area 0)Link ID172.16.10.5192.168.1.1192.168.2.1192.168.3.1ADV 0x80000006Checksum0x6F9C0x8D3D0x7C470x9A37Link count1111Net Link States (Area 0)Link ID172.16.1.2ADV Router192.168.2.1Age1966Seq#Checksum0x8000000D 0xCFE8Summary Net Link States (Area 0)Link ID172.16.10.4172.16.20.0172.16.51.1ADV A7460xA633Router Link States (Area 1)Link ID192.168.3.1192.168.4.1ADV Router192.168.3.1192.168.4.1Age170712Seq#Checksum Link count0x80000007 0xE43E20x80000005 0x182A3Summary Net Link States (Area 1)Link ID0.0.0.0ADV Router192.168.3.1Age171Seq#Checksum0x80000003 0x8648Type-5 AS External Link StatesLink ID11.0.0.012.0.0.013.0.0.0ABR-2#ADV x30F70x2304Tag000
Internal:Area 1 Totally StubbyInternal#show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is 172.16.10.5 to network 0.0.0.0172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks172.16.20.0/24 is
Instructors: Although there are some explanation contained in this lab, it is designed to coincide with the Multi-area OSPF PowerPoint lesson. The information in the PowerPoint explains much of the information and output in this lab. If you need access to t
8. Single-Area OSPF a. Introduction b. Characteristics of OSPF c. OSPF Messages d. OSPF Operation e. Configuring Single-Area OSPFv2 f. Configure Single-Are OSPFv2 g. OSPF Cost h. Verify OSPF i. OSPFv2 vs. OSPFv3 j. Configuring OSPFv3 k. Verify OSPFv3 9. Access Control Lists a. Introduction b. IP ACL Operation c. Standard Versus Extended IPv4 .
RIP (Routing Information Protocol ) เป็น routing protocol แบบ distance vector . 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
Manolis Surligas (CSD, UoC) OSPF tutorial May 14, 2019 1 / 15 OSPF tutorial Computer Science Department, University of Crete Manolis Surligas surligas@csd.uoc.gr May 14, 2019. Open Shortest Path First (OSPF) OSPF is a dynamic routing protocol It is classi ed as an Interior Gateway Protocol (IGP) . (in RIP this was 15) OSPF uses IP multicast .
ip ospf 10 area 0 ! interface Serial2 ip address 192.16.64.2 255.255.255.0 ip ospf 10 area 0 ip ospf message-digest-key 1 md5 mk6 ! router ospf 10 area 0 authentication message-digest interface Loopback0 ip address 172.16.10.36 255.255.255.255 ip ospf 10 area 0 ! interface Serial1/0 ip address 192.16.64.1 255.255.
Once you are in the Router OSPF configuration sub-mode, configure the LAN network 172.16.1.16/28 to be included in the OSPF updates that are sent out of R1. The OSPF network command uses a combination of network-address and wildcard-mask similar to that which can be used by EIGRP. Unlike EIGRP, the wildcard mask in OSPF is required.
both EIGRP and OSPF, and the combination of EIGRP and OSPF has maximum throughput than EIGRP and OSPF [8]. Mardedi and Rosidi presented the analysis and comparison of performance between EIGRP and OSPF based on Cisco Packet Tracer 6.0.1. They found that EIGRP is better than OSPF in terms of delay and convergence time [9]. Whitfield and Zhu
Configuring an OSPF or OSPF3 Area An OSPF area consists of routers configured with the same area ID. To include a router in a specific area, the common area ID must be assigned and an interface identified. If your network consists of multiple areas you must also configure a backbone area (0.0.0.0) on at least one router.
area whose primary function is the fast and efficient movement of IP packets: Interconnects with other OSPF area types. Also called OSPF area 0. Regular (nonbackbone) area - Connects users and resources: Usually set up along functional or geographical groupings All traffic fro
