• QOS PQ


    PQ:优先级队列?
    1,共有四个队列,分为四个优先级别,默认的流量都是normal?
        优先级分类:1high?2medium?3normal?4low?默认所有流量都走normal队列每个队列为fifo调度
    2,加队:在每一个队列中还是按照fifo的原则加队,按尾丢弃原则丢弃。?
    3,调度:只要高优先级有流量就发高优先级的,直到高优先级的数据发完再发低优先级的数据,这样就有可能造成低优先级的数据无带宽可用。

    预配置
    R1的配置
    R1 (config)#int f0/0
    R1 (config-if)#ip add 172.16.18.101 255.255.255.0
    R1(config-if)#no sh
    实验过程:
    (1)在R1上创建Access-list,定义不同的流量
        R1(config)#access-list 100 permit tcp any any eq www
        R1(config)#access-list 101 permit tcp any any eq ftp
        R1(config)#access-list 102 permit tcp any any eq telnet
        R1(config)#access-list 103 permit tcp any any
    (2)在R1上创建优先级列表
        R1(config)#priority-list 1 protocol ip high list 100
        R1(config)#priority-list 1 protocol ip medium list 101
        R1(config)#priority-list 1 protocol ip normal list 102
        R1(config)#priority-list 1 protocol ip low list 103   
    (3)将优先级列表在接口下应用
        R1(config)#int f0/0
        R1(config-if)#priority-group 1    

    R1(config)#do sho int f0/0
    FastEthernet0/0 is up, line protocol is up
    Hardware is DEC21140, address is ca37.0b1c.0000 (bia ca37.0b1c.0000)
    Internet address is 172.16.18.101/16
    MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
         reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation ARPA, loopback not set
    Keepalive set (10 sec)
    Half-duplex, 100Mb/s, 100BaseTX/FX
    ARP type: ARPA, ARP Timeout 04:00:00
    Last input never, output 00:00:02, 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
         Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
         0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
         0 watchdog
         0 input packets with dribble condition detected
         290 packets output, 30352 bytes, 0 underruns
         0 output errors, 0 collisions, 2 interface resets
         0 babbles, 0 late collision, 0 deferred
         0 lost carrier, 0 no carrier
         0 output buffer failures, 0 output buffers swapped out
    R1#sho queueing
    Current fair queue configuration:(S2/1接口默认是WFQ)
    Interface           Discard    Dynamic Reserved Link    Priority
                          threshold queues   queues    queues queues
    Serial2/0           64         256      0         8       1   
    Serial2/1           64         256      0         8       1   
    Serial2/2           64         256      0         8       1   
    Serial2/3           64         256      0         8       1   
    Serial3/0           64         256      0         8       1   
    Serial3/1           64         256      0         8       1   
    Serial3/2           64         256      0         8       1   
    Serial3/3           64         256      0         8       1   
    Current DLCI priority queue configuration:
    Current priority queue configuration:
    List   Queue Args
    1      high   protocol ip          list 100
    1      medium protocol ip          list 101
    1      normal protocol ip          list 102
    1      low    protocol ip          list 103
    Current custom queue configuration:
    Current random-detect configuration:
    Current per-SID queue configuration:

    R1#sho queueing interface f0/0
    Interface FastEthernet0/0 queueing strategy: priority
    Output queue utilization (queue/count)
            high/65 medium/0 normal/297 low/0
    R1#sho queueing priority
    Current DLCI priority queue configuration:
    Current priority queue configuration:
    List   Queue Args
    1      high   protocol ip          list 100
    1      medium protocol ip          list 101
    1      normal protocol ip          list 102
    1      low    protocol ip          list 103

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  • 原文地址:https://www.cnblogs.com/cyrusxx/p/12824054.html
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