PQ ensures that important traffic gets the fastest handling at each point where it is used. It was designed to give strict priority to important traffic.
pq确保重要数据得到最快的处理在每一个点。这是旨在给予严格的优先级以保证重要的数据转发。
实验要求：
1 将udp协议的16333端口至35252端口都设为低优先级
2 将rip设为高优先级
实验配置
R1(config)#priority-list 1 protocol ip low list 100 //建立优先级列表1，将与access-list 100匹配的流量设为低优先级
R1(config)#access-list 100 permit udp any range 16333 35252 any range 16333 35252 //range命令是设定一个端口范围
R1(config)#priority-list 1 protocol ip high udp rip
R1(config)#int f0/0
R1(config-if)#priority-group 1 //将优先级列表1应用到接口f0/0上
My3377#show queueing
ListQueueArgs
1lowprotocol iplist 100
1highprotocol ipudp port rip
My3377#show ip int s2/1
Serial2/1 is up, line protocol is down
Internet protocol processing disabled
My3377#show int s2/1
Serial2/1 is up, line protocol is down
Hardware is M4T
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
Last input never, output 00:00:08, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: priority-list 1
Output queue (queue priority: size/max/drops):
high: 0/20/0, medium: 0/40/0, normal: 0/60/0, low: 0/80/0
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
13 packets output, 930 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 output buffer failures, 0 output buffers swapped out
4 carrier transitionsDCD=upDSR=upDTR=upRTS=upCTS=up
