四、根據數據包的大小來做策略路由走向：

1、我先把R4上的pbr1下再做一個match:

R4(config)#route-map pbr1 permit 1 R4(config-route-map)#match length 0 600 (匹配一個最小為0 ，最大為600的數據包) ? R4(config)#route-map pbr2 permit 2 R4(config-route-map)#match length 0 800 ?(匹配一個最小為601，最大為800的數據包)

2、在R4上show route-map 看一下：

R4(config)#do sho route-map route-map pbr1, permit, sequence 1 ? Match clauses: ? Set clauses: ??? ip next-hop 192.168.34.3 ? Policy routing matches: 0 packets, 0 bytes route-map pbr2, permit, sequence 2 ? Match clauses: ??? ip address (access-lists): 2 ??? length 601 800 ? Set clauses: ??? ip next-hop 192.168.34.3 ? Policy routing matches: 0 packets, 0 bytes

3、我現在在R5上用擴展ping

R5#ping ip??? Target IP address: 1.1.1.1 Repeat count [5]: 5 Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 5.5.5.5 Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: Packet sent with a source address of 5.5.5.5 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 216/325/404

4、再到R4上看一下route-map

route-map pbr1, permit, sequence 1 ? Match clauses: ??? length 0 600 ? Set clauses: ??? ip next-hop 192.168.24.2 ? Policy routing matches: 5 packets, 520 bytes?? （走這條鏈路了是520bytes） route-map pbr2, permit, sequence 2 ? Match clauses: ??? ip address (access-lists): 2 ??? length 601 800 ? Set clauses: ??? ip next-hop 192.168.34.3 ? Policy routing matches: 0 packets, 0 bytes

5、同樣在R6上用擴展ping 700看一下會走哪里？

R6#ping ip???????? Target IP address: 1.1.1.1 Repeat count [5]: 5 Datagram size [100]: 700 Timeout in seconds [2]: Extended commands [n]: y Source address or interface: 6.6.6.6 Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 700-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: Packet sent with a source address of 6.6.6.6 !!!!! Success rat

6、再次show route-map

R4#? show route-map route-map pbr1, permit, sequence 1 ? Match clauses: ??? length 0 600 ? Set clauses: ??? ip next-hop 192.168.24.2 ? Policy routing matches: 5 packets, 520 bytes?? （這里還是520bytes） route-map pbr2, permit, sequence 2 ? Match clauses: ??? ip address (access-lists): 2 ??? length 601 800 ? Set clauses: ??? ip next-hop 192.168.34.3 ? Policy routing matches: 5 packets, 3520 bytes （這里卻到了3520bytes）

7、我在R6上traceroute ，因為traceroute 過去的話也會小于700

R6#traceroute ip???? ? Target IP address: 1.1.1.1 Source address: 6.6.6.6 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 ? ? 1 192.168.46.4 84 msec 128 msec 92 msec ? 2 192.168.24.2 188 msec 220 msec 280 msec ? 3 192.168.12.1 216 msec *? 260 msec?????????? （小于700，所以就走左邊鏈路了）

轉載于:https://blog.51cto.com/supercisco/250068

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