目的：
让3.1.1.1/24、3.2.1.1/24、3.3.1.1/24到1.1.1.1/24的路由走R4到R1；
让3.4.1.1/24、3.5.1.1/24、3.6.1.1/24到1.1.1.1/24的路由走R3到R1。
第一步：网络互通(略)
第二步：在R3上配制PBR（policy-based routing）
R3(config)#acce
R3(config)#access-list 1 per
R3(config)#access-list 1 permit 3.1.1.1
R3(config)#access-list 1 permit 3.2.1.1
R3(config)#access-list 1 permit 3.3.1.1
R3(config)#acce
R3(config)#access-list 2 per
R3(config)#access-list 2 permit 3.4.1.1
R3(config)#access-list 2 permit 3.5.1.1
R3(config)#access-list 2 permit 3.6.1.1
R3(config)#
R3(config)#route
R3(config)#route-
R3(config)#route-map 
R3(config)#route-map PBR permit 10
R3(config-route-map)#ma
R3(config-route-map)#match ip add 1
R3(config-route-map)#se
R3(config-route-map)#set ip nex
R3(config-route-map)#set ip next-hop 34.0.0.4
R3(config-route-map)#exit
R3(config)#route-map PBR permit 20
R3(config-route-map)#match ip add 2
R3(config-route-map)#set ip next-hop 23.0.0.2
R3(config-route-map)#exit
R3(config)#route-map PBR permit 30
R3(config-route-map)#exit
R3(config)#int s 2/1
R3(config-if)#ip pol
R3(config-if)#ip policy ro
R3(config-if)#ip policy route-map PBR
R3(config-if)#EXIT
R3(config)#int s 2/2
R3(config-if)#ip policy route-map PBR
R3(config-if)#end
R3#
第三步：使用traceroute 命令进行测试
R3#traceroute
Protocol [ip]:
Target IP address: 1.1.1.1

Source address: 3.4.1.1  
Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]:
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Type escape sequence to abort.
Tracing the route to 1.1.1.1

 

  1 34.0.0.4 168 msec 144 msec 96 msec

  2 14.0.0.1 264 msec *  192 msec

R3#tr
R3#traceroute
Protocol [ip]:
Target IP address: 1.1.1.1
Source address: 3.5.1.1

Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]:
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Type escape sequence to abort.
Tracing the route to 1.1.1.1

 

  1 34.0.0.4 120 msec 136 msec 96 msec

  2 14.0.0.1 192 msec *  192 msec

R3#

 

R3#traceroute

Protocol [ip]:

Target IP address: 1.1.1.1

Source address: 3.1.1.1

Numeric display [n]:

Timeout in seconds [3]:

Probe count [3]:

Minimum Time to Live [1]:

Maximum Time to Live [30]:

Port Number [33434]:

Loose, Strict, Record, Timestamp, Verbose[none]: 

Type escape sequence to abort.

Tracing the route to 1.1.1.1

 

  1 34.0.0.4 120 msec 120 msec 72 msec

  2 14.0.0.1 168 msec *  168 msec

R3#tr

R3#traceroute

Protocol [ip]:

Target IP address: 1.1.1.1

Source address: 3.2.1.1

Numeric display [n]:

Timeout in seconds [3]:

Probe count [3]:

Minimum Time to Live [1]:

Maximum Time to Live [30]:

Port Number [33434]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Type escape sequence to abort.

Tracing the route to 1.1.1.1

 

  1 34.0.0.4 92 msec 72 msec 120 msec

  2 14.0.0.1 168 msec *  168 msec

R3#