目的：
让5.5.5.0/24到4.4.4.0/24路由：R5－R2－R1－R4
让25.0.0.0/24到4.4.4.0/24路由：R5－R2－R3－R4
因为默认状态下跌幅：R5－R2－R1－R4
第一步：全网互通
R5#traceroute
Protocol [ip]:
Target IP address: 4.4.4.4
Source address: 5.5.5.5
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 4.4.4.4
 
  1 25.0.0.2 168 msec 216 msec 144 msec
  2 12.0.0.1 240 msec 216 msec 360 msec
  3 14.0.0.4 456 msec 576 msec *
 
R5#traceroute
Protocol [ip]:
Target IP address: 4.4.4.4
Source address: 25.0.0.5
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 4.4.4.4
 
  1 25.0.0.2 144 msec 120 msec
  2 12.0.0.1 216 msec 264 msec 216 msec
  3 14.0.0.4 444 msec *  392 msec
第二步：用route-map在R2上做非等价负载均衡
R2(config)#access-list 1 permit 25.0.0.5
R2(config)#route-map PBR permit 10
R2(config-route-map)#match ip add 1
R2(config-route-map)#set ip next-hop 23.0.0.3
R2(config)#route-map PBR permit 20
R2(config)#
R2(config)#
R2(config)#int f 0/0
R2(config-if)#ip policy route-map PBR
第三步：在R2是查看配制
R2#sh ip policy
Interface      Route map
Fa0/0          PBR
 
R2#sh access-lists
Standard IP access list 1
    10 permit 25.0.0.5
 
R2#sh route-map
route-map PBR, permit, sequence 10
  Match clauses:
    ip address (access-lists): 1
  Set clauses:
    ip next-hop 23.0.0.3
  Policy routing matches: 0 packets, 0 bytes
route-map PBR, permit, sequence 20
  Match clauses:
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes
第四步：用traceroute命令进行测试
R5#traceroute
Protocol [ip]:
Target IP address: 4.4.4.4
Source address: 5.5.5.5
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 4.4.4.4
 
  1 25.0.0.2 136 msec 132 msec 156 msec
  2 12.0.0.1 288 msec 288 msec 216 msec
  3 14.0.0.4 408 msec *  480 msec
R5#traceroute
Protocol [ip]:
Target IP address: 4.4.4.4
Source address: 25.0.0.5
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 4.4.4.4
 
  1 25.0.0.2 216 msec 144 msec 144 msec
  2 23.0.0.3 216 msec 264 msec 312 msec
  3 34.0.0.4 384 msec *  456 msec