三、第一章：基本QOS实验
1.1、使用优先级排队实现QOS
实验图如下

 

R1配置

R2配置

host Host_1

no ip domain-lookup

line con 0

logging sy

exec-time 0 0

int f0/0

duplex full

ip add 192.168.1.2 255.255.255.0

no sh

exit

ip route 0.0.0.0 0.0.0.0 192.168.1.1

host Host_2

no ip domain-lookup

line con 0

logging sy

exec-time 0 0

int f0/0

duplex full

ip add 192.168.1.3 255.255.255.0

no sh

exit

ip route 0.0.0.0 0.0.0.0 192.168.1.1

R3配置

R7配置

host Singapore

no ip domain-lookup

line con 0

logging sy

exec-time 0 0

int f0/0

duplex full

ip add 192.168.1.1 255.255.255.0

exit

int s1/2

ip add 200.200.100.1 255.255.255.0

cl ra 56000

no sh

ip route 0.0.0.0 0.0.0.0 200.200.100.2

host ISP

no ip domain-lookup

line con 0

logging sy

exec-time 0 0

int s1/2

ip add 200.200.100.2 255.255.255.0

no sh

int s1/3

ip add 200.200.50.1 255.255.255.0

cl ra 56000

no sh

ip route 0.0.0.0 0.0.0.0 200.200.50.2

R4配置

 

host WebServer

no ip domain-lookup

line con 0

logging sy

exec-time 0 0

int s1/2

ip add 200.200.50.2 255.255.255.0

no sh

ip route 0.0.0.0 0.0.0.0 200.200.50.1

 

配制完以上后，我们就可以在R3和R7的s1/2端口上的队列机制是什么
用show int s1/2显示如下
Singapore#show int s1/2
Serial1/2 is up, line protocol is up
 Hardware is M4T
 Internet address is 200.200.100.1/24
 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 00:00:08, output 00:00:05, 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: weighted fair
 Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations 0/0/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1536 kilobits/sec
 
正如上面所示，如果未加任何策略，在带宽低于2.048M（E1）速率的时缺省的队列模式为WFQ。如果在高于E1速率时缺省的队列模式为FIFO。
下面我们开始配制策略
R3：
 
Singapore(config)#access-list 101 permit tcp any any eq 80
Singapore(config)#access-list 102 permit ip any any
Singapore(config)#priority-list 1 protocol ip high list 101
Singapore(config)#priority-list 1 protocol ip medium list 102
Singapore(config)#int s1/2
Singapore(config-if)#priority-group 1
R7：
ISP(config)#access-list 101 permit tcp any any eq 80
ISP(config)#access-list 102 permit ip any any
ISP(config)#priority-list 1 protocol ip high list 101
ISP(config)#priority-list 1 protocol ip medium list 102
ISP(config)#int s1/2
ISP(config-if)#priority-group 1
 
 
验证
R3：
Singapore#show queueing priority
Current DLCI priority queue configuration:
Current priority queue configuration:
 
List   Queue Args
1      high   protocol ip          list 101
1      medium protocol ip          list 102
 
Singapore#show queueing interface s1/2
Interface Serial1/2 queueing strategy: priority
 
Output queue utilization (queue/count)
        high/213 medium/0 normal/40 low/0
Singapore#show int s1/2
Serial1/2 is up, line protocol is up
 Hardware is M4T
 Internet address is 200.200.100.1/24
 MTU 1500 bytes, BW 2048 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 00:00:02, output 00:00:00, 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