erouting sba ospf in

Exploration Routing: OSPF Skills Based Assessment (Instructor Version)

Exam Objectives

Completion of this exam requires the following tasks:

Create an addressing scheme to accommodate the hosts on the network

Cable network according to the diagram

Configure OSPF

Configure OSPF priorities

Configure OSPF cost

Verify OSPF operation

Configure a static default route

Scenario

You are a network engineer for a company with multiple locations that are connected through a switch. You are assigned the task of creating an addressing scheme for each client’s LAN. You must set the OSPF priorities so that the HQ router is the DR and the Remote_1 router is the BDR. You must also make sure that the Remote_2 router never takes part in the DR/BDR election.

All contents are Copyright © 2007–2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. of 14

CCNA Exploration Routing Protocols and Concepts Exploration Routing: OSPF Skills Based Assessment

Task 1: Create an Addressing Scheme.

Step 1: Create an addressing scheme for each LAN using the 192.168.1.0/24 address space.

Remote_1: Lo0: 60 Hosts Lo1: 12 Hosts

Remote_2: Lo0: 62 Hosts L01: 28 Hosts

Step 2: Record the appropriate subnet address and mask in Table 1.

Table 1 Device Interface IP Address Subnet Mask

Fa0/0 10.10.10.0 255.255.255.248 HQ Lo0 188.46.37.252 255.255.255.252

Fa0/0 10.10.10.0 255.255.255.248 Lo0 192.168.1.0 255.255.255.192

Remote_1

Lo1 192.168.1.160 255.255.255.240 Fa0/0 10.10.10.0 255.255.255.248 Lo0 192.168.1.64 255.255.255.192

Remote_2

Lo1 192.168.1.128 255.255.255.224

Instructor’s Initial ______

Task 2: Cable and Configure Network.

Step 1 Cable the network according to the Topology Diagram.

Step 2 Place the correct interface address for each router in Table 2.

Table 2 Device Interface IP Address Subnet Mask

Fa0/0 10.10.10.1 255.255.255.248 HQ Lo0 188.46.37.254 255.255.255.252

Fa0/0 10.10.10.3 255.255.255.248 Lo0 192.168.1.1 255.255.255.192

Remote_1

Lo1 192.168.1.161 255.255.255.240 Fa0/0 10.10.10.2 255.255.255.248 Lo0 192.168.1.65 255.255.255.192

Remote_2

Lo1 192.168.1.129 255.255.255.224

Step 3 Verify the configurations.




Task 3: Basic OSPF Configuration.

Step 1 Configure OSPF on each router.

Use Process ID 1and advertise all directly connected networks in OSPF Area 0. Advertise the loopback interface on the HQ router. Remote_1: Remote_1(config)#router ospf 1 Remote_1(config-router)#network 10.10.10.0 0.0.0.7 area 0 Remote_1(config-router)#network 192.168.1.0 0.0.0.63 area 0 Remote_1(config-router)#network 192.168.1.160 0.0.0.15 area 0

Remote_2: Remote_2(config)#router ospf 1 Remote_2(config-router)#network 10.10.10.0 0.0.0.7 area 0 Remote_2(config-router)#network 192.168.1.64 0.0.0.63 area 0 Remote_2(config-router)#network 192.168.1.128 0.0.0.31 area 0

HQ: HQ(config)#router ospf 1 HQ(config-router)#network 10.10.10.0 0.0.0.7 area 0 HQ(config-router)#network 188.46.37.252 0.0.0.3 area 0

Step 2 Verify the OSPF configuration.

Confirm that each router has formed an adjacency with one another and has a path to each network in the topology.

Remote_1: Remote_1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 1 FULL/DROTHER 00:00:39 10.10.10.1 FastEthernet0/0 192.168.1.129 1 FULL/BDR 00:00:39 10.10.10.2 FastEthernet0/0

Remote_2: Remote_2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 1 FULL/DROTHER 00:00:38 10.10.10.1 FastEthernet0/0 192.168.1.161 1 FULL/DR 00:00:38 10.10.10.3 FastEthernet0/0

HQ: HQ#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.129 1 FULL/BDR 00:00:39 10.10.10.2 FastEthernet0/0 192.168.1.161 1 FULL/DR 00:00:39 10.10.10.3 FastEthernet0/0




Task 4: Confirm OSPF Priorities.

Step 1: Verify the OSPF priorities.

Confirm that the DR/BDR election took place and that the Remote_1 router is the DR, Remote_2 is the BDR and the HQ router is the DROTHER.

Remote_1: Remote_1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 1 FULL/DROTHER 00:00:39 10.10.10.1 FastEthernet0/0 192.168.1.129 1 FULL/BDR 00:00:39 10.10.10.2 FastEthernet0/0

Remote_2: Remote_2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 1 FULL/DROTHER 00:00:38 10.10.10.1 FastEthernet0/0 192.168.1.161 1 FULL/DR 00:00:38 10.10.10.3 FastEthernet0/0

HQ: HQ#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.129 1 FULL/BDR 00:00:39 10.10.10.2 FastEthernet0/0 192.168.1.161 1 FULL/DR 00:00:39 10.10.10.3 FastEthernet0/0

Step 2: Configure the HQ router with the highest possible OSPF priority.

HQ(config)#int fa0/0 HQ(config-if)#ip ospf priority 255

Step 3: Assure that the Remote_2 router will never take place in the DR/BDR election process.

Remote_2(config)#int fa0/0 Remote_2(config-if)#ip ospf priority 0

Step 4: Reboot the switch using the reload command to force the OSPF election process.

Step 5: Verify that the OSPF election has occurred.

Confirm that the HQ router is now the DR, the Remote_1 router is the BDR and the Remote_2 router is now the DROTHER.

Remote_1: Remote_1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 255 FULL/DR 00:00:37 10.10.10.1 FastEthernet0/0 192.168.1.129 0 FULL/DROTHER 00:00:37 10.10.10.2 FastEthernet0/0

Remote_2: Remote_2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 255 FULL/DR 00:00:33 10.10.10.1 FastEthernet0/0 192.168.1.161 1 FULL/BDR 00:00:33 10.10.10.3 FastEthernet0/0

HQ: HQ#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.129 0 FULL/DROTHER 00:00:38 10.10.10.2 FastEthernet0/0 192.168.1.161 1 FULL/BDR 00:00:38 10.10.10.3 FastEthernet0/0




Task 5: Configure OSPF Cost.

Step 1: Set the cost on the Remote_2 WAN link to a value of 1.

interface FastEthernet0/0 ip ospf cost 1

Step 2: Set the cost of the HQ WAN link to a value of 100.

interface FastEthernet0/0 ip ospf cost 100

Step 3: Verify the cost in the routing table.

Remote_1: Remote_1#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 00:00:02, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks O 192.168.1.65/32 [110/2] via 10.10.10.2, 00:00:02, FastEthernet0/0 C 192.168.1.0/26 is directly connected, Loopback0 C 192.168.1.160/28 is directly connected, Loopback1 O 192.168.1.129/32 [110/2] via 10.10.10.2, 00:00:03, FastEthernet0/0

Remote_2: Remote_2#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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



188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 00:00:34, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks C 192.168.1.64/26 is directly connected, Loopback0 O 192.168.1.1/32 [110/2] via 10.10.10.3, 00:00:34, FastEthernet0/0 O 192.168.1.161/32 [110/2] via 10.10.10.3, 00:00:34, FastEthernet0/0 C 192.168.1.128/27 is directly connected, Loopback1

HQ: HQ#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 188.46.0.0/30 is subnetted, 1 subnets C 188.46.37.252 is directly connected, Loopback0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/32 is subnetted, 4 subnets O 192.168.1.65 [110/101] via 10.10.10.2, 00:00:02, FastEthernet0/0 O 192.168.1.1 [110/101] via 10.10.10.3, 00:00:02, FastEthernet0/0 O 192.168.1.161 [110/101] via 10.10.10.3, 00:00:02, FastEthernet0/0 O 192.168.1.129 [110/101] via 10.10.10.2, 00:00:03, FastEthernet0/0


Task 6: Confirm OSPF Operation.

Step 1: Verify neighbor adjacencies.

Remote_1: Remote_1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 255 FULL/DR 00:00:30 10.10.10.1 FastEthernet0/0 192.168.1.129 0 FULL/DROTHER 00:00:30 10.10.10.2 FastEthernet0/0

Remote_2: Remote_2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 188.46.37.254 255 FULL/DR 00:00:33 10.10.10.1 FastEthernet0/0 192.168.1.161 1 FULL/BDR 00:00:33 10.10.10.3 FastEthernet0/0

Remote_3: HQ#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.129 0 FULL/DROTHER 00:00:36 10.10.10.2 FastEthernet0/0 192.168.1.161 1 FULL/BDR 00:00:36 10.10.10.3 FastEthernet0/0



Step 2: Verify that all networks are present in the routing table.

Remote_1: Remote_1#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 00:59:26, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks O 192.168.1.65/32 [110/2] via 10.10.10.2, 00:59:26, FastEthernet0/0 C 192.168.1.0/26 is directly connected, Loopback0 C 192.168.1.160/28 is directly connected, Loopback1 O 192.168.1.129/32 [110/2] via 10.10.10.2, 00:59:27, FastEthernet0/0

Remote_2: Remote_2#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 01:00:47, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks C 192.168.1.64/26 is directly connected, Loopback0 O 192.168.1.1/32 [110/2] via 10.10.10.3, 01:00:47, FastEthernet0/0 O 192.168.1.161/32 [110/2] via 10.10.10.3, 01:00:47, FastEthernet0/0 C 192.168.1.128/27 is directly connected, Loopback1

HQ: HQ#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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



188.46.0.0/30 is subnetted, 1 subnets C 188.46.37.252 is directly connected, Loopback0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/32 is subnetted, 4 subnets O 192.168.1.65 [110/101] via 10.10.10.2, 00:58:49, FastEthernet0/0 O 192.168.1.1 [110/101] via 10.10.10.3, 00:58:49, FastEthernet0/0 O 192.168.1.161 [110/101] via 10.10.10.3, 00:58:49, FastEthernet0/0 O 192.168.1.129 [110/101] via 10.10.10.2, 00:58:50, FastEthernet0/0


Task 7: Static Default Route

Step 1: Configure a static default route on the HQ router.

HQ(config)#ip route 0.0.0.0 0.0.0.0 lo0

Step 2: Propagate the static default route to the other routers in the network.

HQ(config)#router ospf 1 HQ(config-router)#default-information originate

Step 3: Verify that each router can see the static default route in their routing table.

HQ: HQ#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 0.0.0.0 to network 0.0.0.0 188.46.0.0/30 is subnetted, 1 subnets C 188.46.37.252 is directly connected, Loopback0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/32 is subnetted, 4 subnets O 192.168.1.65 [110/101] via 10.10.10.2, 01:31:29, FastEthernet0/0 O 192.168.1.1 [110/101] via 10.10.10.3, 01:31:29, FastEthernet0/0 O 192.168.1.161 [110/101] via 10.10.10.3, 01:31:29, FastEthernet0/0 O 192.168.1.129 [110/101] via 10.10.10.2, 01:31:31, FastEthernet0/0 S* 0.0.0.0/0 is directly connected, Loopback0

Remote_1: Remote_1#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 10.10.10.1 to network 0.0.0.0



188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 01:31:53, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks O 192.168.1.65/32 [110/2] via 10.10.10.2, 01:31:53, FastEthernet0/0 C 192.168.1.0/26 is directly connected, Loopback0 C 192.168.1.160/28 is directly connected, Loopback1 O 192.168.1.129/32 [110/2] via 10.10.10.2, 01:31:54, FastEthernet0/0 O*E2 0.0.0.0/0 [110/1] via 10.10.10.1, 00:28:04, FastEthernet0/0

Remote_2: Remote_2#show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 10.10.10.1 to network 0.0.0.0 188.46.0.0/32 is subnetted, 1 subnets O 188.46.37.254 [110/2] via 10.10.10.1, 01:31:43, FastEthernet0/0 10.0.0.0/29 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 192.168.1.0/24 is variably subnetted, 4 subnets, 3 masks C 192.168.1.64/26 is directly connected, Loopback0 O 192.168.1.1/32 [110/2] via 10.10.10.3, 01:31:43, FastEthernet0/0 O 192.168.1.161/32 [110/2] via 10.10.10.3, 01:31:43, FastEthernet0/0 C 192.168.1.128/27 is directly connected, Loopback1 O*E2 0.0.0.0/0 [110/1] via 10.10.10.1, 00:27:53, FastEthernet0/0


Task 8: Verify Connectivity

Step 1 Ping the loopback interface on the HQ router from the Remote_1 and Remote_2 routers.

Remote_1: Remote_1#ping 188.46.37.254 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 188.46.37.254, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms Remote_2: Remote_2#ping 188.46.37.254 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 188.46.37.254, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms




Final Configurations

HQ: HQ#show run Building configuration... Current configuration : 1251 bytes version 12.4 no service password-encryption hostname HQ ip subnet-zero interface Loopback0 ip address 188.46.37.254 255.255.255.252 ! interface FastEthernet0/0 ip address 10.10.10.1 255.255.255.248 ip ospf cost 100 ip ospf priority 255 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 no ip address shutdown no fair-queue clock rate 125000 ! interface Serial0/0/1 no ip address shutdown ! router ospf 1 log-adjacency-changes network 10.10.10.0 0.0.0.7 area 0 network 188.46.37.252 0.0.0.3 area 0 default-information originate ! ip classless

! ip route 0.0.0.0 0.0.0.0 Loopback0 ! ip http server

! !

control-plane

! !



line con 0 line aux 0 line vty 0 4 login ! scheduler allocate 20000 1000 ! end

Remote_1: Remote_1#show run Building configuration... Current configuration : 1050 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption !

hostname Remote_1 ! boot-start-marker boot-end-marker ! ! no aaa new-model ! resource policy ! ip subnet-zero ! ! ip cef ! ! ! ! ! ! interface Loopback0 ip address 192.168.1.1 255.255.255.192 ! interface Loopback1 ip address 192.168.1.161 255.255.255.240 ! interface FastEthernet0/0 ip address 10.10.10.3 255.255.255.248 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto !



interface Serial0/0/0 no ip address shutdown clock rate 125000 ! interface Serial0/0/1 no ip address shutdown clock rate 125000 ! router ospf 1 log-adjacency-changes network 10.10.10.0 0.0.0.7 area 0 network 192.168.1.0 0.0.0.63 area 0 network 192.168.1.160 0.0.0.15 area 0 ! ip classless ! ip http server

! !

control-plane

! ! line con 0 line aux 0 line vty 0 4 login ! scheduler allocate 20000 1000 ! end

Remote_2: Remote_2#show run Building configuration... Current configuration : 1088 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Remote_2 ! boot-start-marker boot-end-marker ! ! no aaa new-model ! resource policy ! ip subnet-zero



! ! ip cef ! ! ! ! ! ! interface Loopback0 ip address 192.168.1.65 255.255.255.192 ! interface Loopback1 ip address 192.168.1.129 255.255.255.224 ! interface FastEthernet0/0 ip address 10.10.10.2 255.255.255.248 ip ospf cost 1 ip ospf priority 0 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 no ip address shutdown clock rate 125000 ! interface Serial0/0/1 no ip address shutdown clock rate 125000 ! router ospf 1 log-adjacency-changes network 10.10.10.0 0.0.0.7 area 0 network 192.168.1.64 0.0.0.63 area 0 network 192.168.1.128 0.0.0.31 area 0 ! ip classless ! ip http server ! ! control-plane ! ! line con 0 line aux 0 line vty 0 4 login !




scheduler allocate 20000 1000 ! end

erouting sba ospf in

Documents

byte icmp echos

instructors initial

cisco public information

ip http server

user static route

static default route

ip address shutdown

interface fastethernet0 0 fastethernet0 0