监测和调试 OSPF协议( 三 ) _云知道

　... (此处删节)
R2#sh ip ospf int s1
Serial 1 is up, line protocol is up
　Internet Address 192.168.1.2/30, Area 0
　Process ID 100, Router ID 10.1.2.1, Network Type POINT_TOJPOINT,Cost:64
　Transmit Delay is 1 sec. State POINT_TO_POINT,
...(此处删节)
R2#
Term_Server>1
[Resuming connection 1 to r1 ... ]
R1#sh ip ospf int e0
Ethernet0 is up, line protocol is up
　Internet Address 172.16.1.1/24, Area 0
　Process ID 100, Router ID 192.168.1.1, Network Type BROADCAST,Cist:10
　Transmit Delay is 1 sec. State DR, Priority 1
... (此处删节)
R1#
第2段:更改接口带宽以影响链路Cost
Term_Server>2
[Resuming connection 2 to r2 ... ]
R2#conft
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#int s0
R2(config-if)#bandwidth 64
R2(config-if)#int si
R2(config-if)#bandwidth 125
R2(config-if)#^Z
R2#sh ip route ospf
172.16.0.0/24 is subnetted, 2 subnets
O　172.16.1.0 [110/810] via 192.168.1.1, 00:00:09, Serial1
O　172.16.3.0 [110/1572] via 192.168.1.6, 00:00:09, Serial0
R2#sh int s0
Serial0 is up, line protocol is up
　Hardware is HD64570
　Internet address is 192.168.1.5/30
　MTU 1500 bytes,BW 64 Kbit,DLY 20000 usec,
reliability 255/255, txioad 1/255, rxioad 1/255
... (此处删节)
R2#sh int s1
Serial1 is up, line protocol is up
　Hardware is HD64570
　Internet address is 192.168.1.2/30
　MTU 1500 bytes,BW 125 Kbit,DLY 20000 usec,
reliability 255/255, txioad 1/255, rxioad 1/255
...(此处删节)
R2#sh ip ospf int s0
Serial0 is up, line protocol is up
　Internet Address 192.168.1.5/30, Area 0
　Process ID 100, Router ID 10.1.2.1, Network Type POINT_TO_POINT,Cost:1562
　Transmit Delay is 1 sec. State POINT_TO_POINT,
... (此处删节)
R2#sh ip ospf int s1
Serial 1 is up, line protocol is up
　Internet Address 192.168.1.2/30, Area 0
　Process ID 100, Router ID 10.1.2.1, Network Type POINT_TO_POINT,Cost:800
　Transmit Delay is 1 sec. State POINT_TO_POINT,
... (此处删节)
R2#
第3段:直接更改接口相关Cost
R2(config)#int s0
R2(config-if)#ip ospfcost 200
R2(config-if)#^Z
R2#sh ip ospf int s0
Serial0 is up, line protocol is up
　Internet Address 192.168.1.5/30, Area 0
　Process ID 100, Router ID 10.1.2.1, Network Type POINT_TO_POINT,Cost:200
　Transmit Delay is 1 sec. State POINT_TO_POINT,
　Timer intervals configured. Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
　Index 2/2, flood queue length 0
　Next 0x0(0)/0x0(0)
　Last flood scan length is 1, maximum is 1
　Last flood scan time is 0 msec, maximum is 4 msec
　Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 192.168.1.6
　Suppress hello for 0 neighbor(s)
R2#sh ip route ospf
172.16.0.0/24 is subnetted, 2 subnets
O　172.16.1.0 [110/1572] via 192.168.1.1, 00:00:11, Serial1
O　172.16.3.0 [110/210] via 192.168.1.6, 00:00:11, Serial0
R2#
(1)在第1段开始时，首先在R2路由器上把S0接口加入到OSPF路由进程中，恢复全网的连通性。
使用show ip route ospf命令查看OSPF路由表，会看到经由S0和S1的2条路由的Cost值均为74 。
这一结果是我们在以前的实验中没有注重到的，显然它不是我们所希望看到的，因为我们预期中的Cost值是S1比S0低，因为S1的带宽(125kbit/s)要比S0的带宽(64kbit/s)高。
(2)通过发出show interface命令对S0和S1的带宽进行考察发现，它们的带宽(BW)均为1544kbit/s ，这是串行接口的缺省带宽。可见路由器并不能根据时钟的设置而自动更改带宽的设置。

监测和调试 OSPF协议( 三 )

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