OSPF单区域修改cost开销

1、OSPF单区域，在没有修改链路开销其路由线路是:下面的两台路由器模拟PC：4台路由器的配置模板：DR：conf tint e0/Oip add 10.0.1.1 255.255.255.252no shutint e0/1ip add 10.0.1.5 255.255.255.252no shutexitint e0/2ip add 10.0.1.9 255.255.255.252no shutint loopback 0ip add 172.16.1.100 255.255.255.255 (router ID)no shutexitrouter ospf 10network 10.0.1.

2、0 0.0.0.3 area 0network 10.0.1.4 0.0.0.3 area 0network 10.0.1.8 0.0.0.3 area 0exitexitwriteBDR：备份指定路由器conf tint e0/1ip add 10.0.1.6 255.255.255.252no shutint e0/2ip add 10.0.1.13 255.255.255.252no shutint e0/3ip add 10.0.1.17 255.255.255.252no shutexitint loopback 0ip add 172.16.1.90 255.255.255.255

3、 (router ID)no shutexitrouter ospf 10network 10.0.1.4 0.0.0.3 area 0network 10.0.1.12 0.0.0.3 area 0network 10.0.1.16 0.0.0.3 area 0exitexitwrite第三台：conf tint e0/0ip add 10.0.1.2 255.255.255.252no shutint e0/2ip add 10.0.1.18 255.255.255.252no shutint e0/1ip add 1.1.1.1 255.255.255.252no shutexitint

4、 loopback 0ip add 172.16.1.80 255.255.255.255 (router ID)no shutexitrouter ospf 10network 10.0.1.0 0.0.0.3 area 0network 10.0.1.16 0.0.0.3 area 0network 1.1.1.0 0.0.0.3 area 0pass e0/1 (用户端口排除掉)exitexitwrite第四台路由器：conf tint e0/0ip add 10.0.1.10 255.255.255.252no shutint e0/2ip add 10.0.1.14 255.255.

5、255.252no shutint e0/3ip add 2.2.2.2 255.255.255.252no shutexitint loopback 0ip add 172.16.1.70 255.255.255.255 (router ID ) no shutexitrouter ospf 10network 10.0.1.8 0.0.0.3 area 0network 10.0.1.12 0.0.0.3 area 0network 2.2.2.2 0.0.0.3 area 0pass e0/3exitexitwrite模拟PC2：conf t no ip routingint e0/3i

6、p add 2.2.2.1 255.255.255.252no shut模拟PCI：conf tno ip routingint e0/Oip add 1.1.1.2 255.255.255.252 no shut配置好之后，PC1到PC2走如图所示路线：DR数据链路库的情况：show ip ospf neighboru#l#shQW ip ospf :nl#show ip ospf neighborleighbor IDPriStateDead TimeAddressInterfaceL72.16.1.701FULL/BDR00:00:3410.0.1.10Ether:net0/2L72.1

7、6.1.901FOLL/RDR00:00:3810.0.1.6EthernetO/1L72.16.1.80E口1FULL/BDR00:00:3610.0.1.2Eth已工n已七0/。Show ip ospfl#show ip ospf :nl#show ip ospfRouting Process ospf 10n with ID 172.16.1.100Supports only single TO5 (1050) routesSupports opaque LSASupports Link-local Signaling (LLS)Initial SPF schedule delay 50

8、00 msecsMinimum hold time between two consecutive SPFs 10000 nctsecsMaximum wait time between two consecutive SPFs 10000 msecsXinimurci LSA interval 5 secs Minimum LSA arrival 1 secsLSA group pacing timer 240 secsInterface flood pacing timer 33 msecsRetransmission pacing timer 66 msecsdumber of exte

9、rnal LSA 0.Checksum Sum 0 x000000dumber of opaque AS LSA 0 Checksum Sum 0 x000000dumber of DCbitless external and opaque AS LSA 0dumber of DoNotAge external and opaque AS LSA 0 dumber of areas in this router is 1. 1 normal 0 stub 0 nssaExternal flood list length 0Area BACKBONE(0) Number of interface

10、s in this area is 3Area has :no authenticationSPF algorithra last executed 00:03:19.944 ago SPF algorithra executed 5 times Area ranges areNumberof L5A 9 Checksum Sum OX0420E2Number of opaque link LSA 0. Checksum Sum 0 x000000Number of DCbitless LSA 0Numberof indicatian LSA 0Number of DoNotAgeLSA 0F

11、lood list length 0Show ip routeRl# show ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRPf EX - ElGRP external, 0 - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 El - OSPF external type lf E2 - OSPF external type 2 i 一 IS-ISf

12、 5U 一 IS-IS suimary, LI - IS-IS level-1, L2 一 IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route 一 ODR, P periodic downloaded static routeGateway of lastresort is not set1.0.0.0/301.1.1.02.0.0.0/302.2.2.0is siibnettedf 1 subnets 110/20 via 10.0.1.2, 00:03:45, Ether

13、net0/0 is siibnettedf 1 subnets 110/20 via 10.0.1.10, 00:03:45, Ethernet0/2172.16.0.0/32 is subnetted, 1 subnets172.16.1.100 is directly connected, LoopbackO 10.0.0.0/30 is subnettedf 5 subnets10.0.1.8 is directly coimecred, Ether:net0/210.0.1.12 |110/20 via 10.0.1.10, 00:03:45, EthernetO/2 110/20 via 10.0.1.6, 00:03:45, Ethernet0/l 10.0.1.0 is di