OSPF multi-region configuration and route Summary

Topology Description: R1 and R2 are in area 1, R2 and R3 are in Area 0, and R3 and R4 are in area 2. R2 and R3. Tutorial purpose: 1. How to configure OSPF in multiple regions 2, how to differentiate routing in different regions 3, and how to reduce route entries in OSPF through route Aggregation
For details about the configuration of R1, R2, R3, and R4 on the vro at www.2cto.com, refer to Attachment: 1. view the OSPF neighbor table on R2: r2 # show ip ospf ne Neighbor ID Pri State Dead Time Address Interface192.168.1.9 0 FULL/-00:00:33 192.168.1.6 Serial1/110.1.2.1 0 FULL/-00:00:32 192.168.1.1 Serial1/0 indicates that R1 and R3 have established neighbors link
Http://service.ap-southeast-1.maxcompute.aliyun-inc.com/api, EX-OSPF 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, su-IS summary, 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 172.16.0.0/32 is subnetted, 2 subnetsO IA 172.16.1.1 [110/129] via 192.168.1.6, 00:26:33, Serial1/1O IA 172.16.2.1 [110/129] via 192.168.1.6, 00:26:33, Serial1/1 10.0.0.0/32 is subnetted, 2 subnetsO 10.1.2.1 [110/65] via 192.168.1.1, 00:26:43, serial1/0O 10.1.1.1 [110/65] via 192.168.1.1: 43, Serial1/0 192.168.1.0/30 is subnetted, 3 subnetsO IA 192.168.1.8 [110/128] via 192.168.1.6, 00:26:33, Serial1/1C 192.168.1.0 is directly connected, Serial1/0C 192.168.1.4 is directly connected, serial1/1 o ia indicates a route in other regions; O indicates a route in the region; C indicates a direct connection to the vro CIDR Block [110/128] 110 indicates the OSPF Management Distance, 128 indicates that the COST value is smaller than the COST value for different routing protocols when routing is selected. 3. view the Link status database on R3: www.2cto.com R2 # show ip ospf database OSPF Router with ID (192.168.1.5) (Process ID 1) Router Link States (Area 0) link id adv Router Age Seq # Checksum Link count192.168.1.5 192.168.1.5 270 0x80000002 0x003342 2192.168.1.9 192.168.1.9 413 0x80000003 0x00D698 2 Summary Net Link States (Area 0) link id adv Router Age Seq # Checksum10.1.1.1 192.168.1.5 270 0x80000002 0x003F3F10. 1.2.1 192.168.1.5 270 0x80000002 0x003449172. 16.1.1 192.168.1.9 659 0x80000002 0x003098172. 16.2.1 192.168.1.9 659 0x80000002 0x0025A2192. 168.1.0 192.168.1.5 270 0x80000002 0x000A1B192. 168.1.8 192.168.1.9 659 0x80000002 0x00A177 Router Link States (Area 1) link id adv Router Age Seq # Checksum Link count10.1.2.1 10.1.2.1 372 0x80000008 0x005CA5 4192.168.1.5 192.168.1.5 270 0 0x80000005 0x0027B7 2 Summary Net Link States (Area 1) link id adv Router Age Seq # Checksum172.16.1.1 192.168.1.5 271 0x80000002 0x00CAC1172. 16.2.1 192.168.1.5 271 0x80000002 0x00BFCB192. 168.1.4 192.168.1.5 271 0x80000002 0x00E13F192. 168.1.8 192.168.1.5 271 0x80000002 0x003CA0 Router link States type 1 LSA, Summary Net Link States Type 3 LSA

Attachment: http://up.2cto.com/2013/0202/20130202022529830.rar