OSPF Stub region configuration instance

1. Topology

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Procedure

1. Configure the interface IP address according to the Topology

2. Enable the OSPF protocol

Declare the network and region

Configure the region type

3. view the OSPF Database

4. view the route table

Resolve the configuration command, please wait for the blogger to add)

R1 # R1 # config terminal R1 (config) # interface ran f0/0, f0/1 R1 (config-if) # no shut R1 (config-if) # interface f0/0 R1 (config-if) # ip address 192.168.0.1 255.255.255.0 R1 (config) # interface f0/1 R1 (config-if) # no shut R1 (config-if) # ip add 172.20.0.1 255.255.0.0 R1 (config-if) # exit R1 (config) # router ospf 1 R1 (config-router )#? R1 (config-router) # network 192.168.0.0 0.0.255 area 0 R1 (config-router) # network 172.255.0.0 0.0.255.255 area 2 R1 (config-router) # exit R1 (config) # end R1 # copy runn start

R1 # show ip ospf database OSPF Router with ID (192.168.0.1) (Process ID 1) Router Link States (Area 0) Link id adv Router Age Seq # Checksum Link count 192.168.0.1 192.168.0.1 1584 0x80000006 0xF38E 1 192.168.0.2 192.168.0.2 1455 0x80000005 0xF38C 1 Net Link States (Area 0) Link id adv Router Age Seq # Checksum 192.168.0.2 192.168.0.2 1455 0x80000002 0x9CEF Summary Net Link States (Area 0) Link id adv Router Age Seq # Checksum 172.16.0.0 192.168.0.2 715 0x80000004 0xEF21 172.17.0.0 192.168.0.2 715 0x80000002 0xF11F 172.255.0.0 192.168.0.1 1575 0x80000001 0xCB45 Router Link States (Area 2) Link id adv Router Age Seq # Checksum Link count 192.168.0.1 192.168.0.1 1584 0x80000001 0x8912 1 Summary Net Link States (Area 2) Link id adv Router Age Seq # Checksum 172.16.0.0 192.168.0.1 1595 0x80000001 0x60E 172.17.0.0 192.168.0.1 1595 0x80000001 0x40E 192.168.0.0 192.168.0.1 1595 0x80000001 0xCF98 R1 #

R2 # config R2 (config) # interface ran f0/0, f0/1 R2 (config-if) # no shut R2 (config-if) # interface f0/0 R2 (config-if) # ip address 192.168.0.2 255.255.255.0 R2 (config-if) # interface f0/1 R2 (config-if) # ip address 172.16.0.1 255.255.0.0 R2 (config-if) # ip ospf? R2 (config-if) # ip ospf network? Broadcast Specify OSPF broadcast multi-access network Non-broadcast Specify ospf nbma network Point-to-multipoint Specify OSPF point-to-multipoint network Point-to-point Specify OSPF point-to-point network R2 (config-if) # exit R2 (config) # router ospf 3 R2 (config-router) # network 192.168.0.0 0.0.255 area 0 R2 (config-router) # network 172.16.0.0 0.0.255.255 area 1 R2 (config) # router ospf 3 R2 (config-router )#? Router configuration commands: Area OSPF area parameters R2 (config-router) # area? <0-4294967295> OSPF area ID as a decimal value A. B .C.D OSPF area ID in IP address format R2 (config-router) # area 1? Authentication Enable authentication Default-cost Set the summary default-cost of a NSSA/stub area Nssa Specify a NSSA area Range Summarize routes matching address/mask (border routers only) Stub Specify a stub area Virtual-link Define a virtual link and its parameters R2 (config-router) # area 1 stub? No-summary Do not send summary LSA into stub area <Cr> R2 (config-router) # area 1 stub no-summary R2 (config-router) # end R2 # copy runn start

R2 # show ip ospf database OSPF Router with ID (192.168.0.2) (Process ID 3) Router Link States (Area 0) Link id adv Router Age Seq # Checksum Link count 192.168.0.1 192.168.0.1 363 0x80000007 0xF18F 1 192.168.0.2 192.168.0.2 63 0x80000006 0xF18D 1 Net Link States (Area 0) Link id adv Router Age Seq # Checksum 192.168.0.2 192.168.0.2 63 0x80000003 0x9AF0 Summary Net Link States (Area 0) Link id adv Router Age Seq # Checksum 172.16.0.0 192.168.0.2 1323 0x80000004 0xEF21 172.17.0.0 192.168.0.2 1323 0x80000002 0xF11F 172.20.0.0 192.168.0.1 363 0x80000002 0xC946 Router Link States (Area 1) Link id adv Router Age Seq # Checksum Link count 172.17.0.1 172.17.0.1 1309 0x80000004 0xEB7D 2 192.168.0.2 192.168.0.2 1333 0x80000004 0xA638 1 Net Link States (Area 1) Link id adv Router Age Seq # Checksum 172.16.0.1 192.168.0.2 1333 0x80000002 0xF8EE Summary Net Link States (Area 1) Link id adv Router Age Seq # Checksum 0.0.0.0 192.168.0.2 1820 0x80000002 0x973A

R3 # config R3 (config) # inter ran f0/0, f0/1 R3 (config-if) # no shut R3 (config-if) # interface f0/0 R3 (config-if) # ip address 172.16.0.2 255.255.255.0.0 R3 (config-if) # interface f0/1 R3 (config-if) # ip address 172.17.0.1 255.255.255.0.0 R3 (config-if) # exit R3 (config) # router ospf 1 R3 (config-router) # network 172.16.0.0 0.0.255.255 area 1 R3 (config-router) # network 172.17.0.0 0.0.255.255 area 1 R3 (config-router) # area 1 stub no-summary R3 (config-router) # end R3 # copy runn start

R3 # show ip ospf database OSPF Router with ID (172.17.0.1) (Process ID 1) Router Link States (Area 1) Link id adv Router Age Seq # Checksum Link count 172.17.0.1 172.17.0.1 32 0x80000003 0xED7C 2 192.168.0.2 192.168.0.2 33 0x80000003 0xA837 1 Net Link States (Area 1) Link id adv Router Age Seq # Checksum 172.16.0.1 192.168.0.2 33 0x80000001 0 xFAED Summary Net Link States (Area 1) Link id adv Router Age Seq # Checksum 0.0.0.0 192.168.0.2 457 0x80000001 0x9939 R3 # show ip interface brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0 172.16.0.2 YES manual up FastEthernet0/1 172.17.0.1 YES manual up R3 # show ip ospf database OSPF Router with ID (172.17.0.1) (Process ID 1) Router Link States (Area 1) Link id adv Router Age Seq # Checksum Link count 172.17.0.1 172.17.0.1 855 0x80000004 0xEB7D 2 192.168.0.2 192.168.0.2 871 0x80000004 0xA638 1 Net Link States (Area 1) Link id adv Router Age Seq # Checksum 172.16.0.1 192.168.0.2 871 0x80000002 0xF8EE Summary Net Link States (Area 1) Link id adv Router Age Seq # Checksum 0.0.0.0 192.168.0.2 1358 0x80000002 0x973A R3 #

View route table

R1 # show ip route Codes: C-connected, S-static, I-IGRP, R-RIP, M-mobile, B-BGP D-OSPF, EX-VPN 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, L1-IS level-1, L2-IS level-2, ia-IS inter area *-Candidate default, U-per-user static route, o-ODR P-periodic downloaded static route Gateway of last resort is not set O ia 172.17.0.0/16 [110/3] via 192.168.0.2, 00:30:36, FastEthernet0/0 O ia 172.16.0.0/16 [110/2] via 192.168.0.2, 00:30:36, FastEthernet0/0 C 172.255.0.0/16 is directly connected, FastEthernet0/1 C 192.168.0.0/24 is directly connected, FastEthernet0/0

R2 # show ip route Codes: C-connected, S-static, I-IGRP, R-RIP, M-mobile, B-BGP D-OSPF, EX-VPN 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, L1-IS level-1, L2-IS level-2, ia-IS inter area *-Candidate default, U-per-user static route, o-ODR P-periodic downloaded static route Gateway of last resort is not set O 172.17.0.0/16 [110/2] via 172.16.0.2, 00:47:34, FastEthernet0/1 C 172.16.0.0/16 is directly connected, FastEthernet0/1 O ia 172.255.0.0/16 [110/2] via 192.168.0.1, 00:30:55, FastEthernet0/0 C 192.168.0.0/24 is directly connected, FastEthernet0/0

R3 # show ip route Codes: C-connected, S-static, I-IGRP, R-RIP, M-mobile, B-BGP D-OSPF, EX-VPN 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, L1-IS level-1, L2-IS level-2, ia-IS inter area *-Candidate default, U-per-user static route, o-ODR P-periodic downloaded static route Gateway of last resort is 172.16.0.1 to network 0.0.0.0 C 172.17.0.0/16 is directly connected, FastEthernet0/1 C 172.16.0.0/16 is directly connected, FastEthernet0/0 O * IA 0.0.0.0/0 [110/2] via 172.16.0.1, 00:47:55, FastEthernet0/0 R3 #

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