浮動靜態路由

 

作者：   stanley.wy & allens

 

 

R1	fa0/0	192.168.1.1/24
	s1/1	192.168.2.1/24
R2	fa0/0	192.168.1.2/24
	s1/0	192.168.2.2/24
	lo 0	192.168.3.1/24

 

步驟一：配置各路由器的IP地址，並使用ping命令確認直連接口相互可以ping通。

 

步驟二：在R1上配置到R2的迴環接口的靜態路由．

 

R1(config)#ip route 192.168.3.0 255.255.255.0 192.168.1.2

R1(config)#ip route 192.168.3.0 255.255.255.0 192.168.2.2[s1] 

 

步驟三：分析：查看R1的路由表

R1#show ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP

       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

 

C    192.168.1.0/24 is directly connected, FastEthernet0/0

C    192.168.2.0/24 is directly connected, Serial1/1

S    192.168.3.0/24 [1/0] via 192.168.1.2

                    [1/0] via 192.168.2.2

[s2] R1#

 

步驟三：先刪除原先路由，調整靜態路由

R1(config)#no ip route 192.168.3.0 255.255.255.0 192.168.2.2[s3] 

R1(config)#ip route 192.168.3.0 255.255.255.0 192.168.2.2 100[s4] 

 

步驟四：再次檢查路由表,發現路由器沒有做均分負載

R1#show ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP

       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

 

C    192.168.1.0/24 is directly connected, FastEthernet0/0

C    192.168.2.0/24 is directly connected, Serial1/1

S    192.168.3.0/24 [1/0] via 192.168.1.2[s5] 

 

步驟五：將R1的fa0/0的接口shutdown掉．再觀察路由表

R1#show ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP

       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

 

C    192.168.2.0/24 is directly connected, Serial1/1

S    192.168.3.0/24 [100/0] via 192.168.2.2[s6] 

 

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 [s1]因爲Ｒ１有兩條路徑到達Ｒ２的192.168.3.0/24的網絡

 [s2]在此發現R1在做均分負載．但是注意：R1與R2的廣域網連接的速度與以太網連接網速度並不匹配．在此做法是不智的．

 [s3]刪除目的，是避免做均分負載

 [s4]指出此條路由管理距離爲100．需要注意的是默認的管理離是1.而且路由器永遠會選擇管理距離小的路由．

 [s5]到達192.168.3.0/24目前下一跳爲192.168.1.2/24

 [s6]到達192.168.3.0/24現在使用192.168.2.2/24作爲下一跳．