交换机双工速率匹配

两种方式测试 GNS3 环境

交换机若是双工出现问题,可能会出现很严重的丢包现象;若是速率不同,就直接无法正常通信。那么出现这种情况该怎么配置?


实验拓扑

两种方式测试 GNS3 环境

使用两台交换机直连,每台下面再连接一台VPC。地址规划如下:

名称 IP地址
PC1 192.168.10.10/24
PC2 192.168.10.20/24

配置方法

接口模式下配置speed以及duplex

SW1#configure terminal  SW1(config)#interface fastEthernet 1/0  SW1(config-if)#speed ?    10    Force 10 Mbps operation    100   Force 100 Mbps operation    auto  Enable AUTO speed configuration  SW1(config-if)#duplex ?    auto  Enable AUTO duplex configuration    full  Force full duplex operation    half  Force half-duplex operation  

配置过程

SW1
  • SW1关闭路由功能
SW1#configure terminal  SW1(config)#no ip routing  
  • 配置全双工,接口速率为100。
SW1(config)#interface fastEthernet 1/0  SW1(config-if)#speed 100  SW1(config-if)#duplex full  
  • 查询配置,show interfaces fastEthernet 1/0,第七行。
SW1(config-if)#end  SW1#show interfaces fastEthernet 1/0  FastEthernet1/0 is up, line protocol is up    Hardware is Fast Ethernet, address is c201.2c14.f100 (bia c201.2c14.f100)    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)    Full-duplex, 100Mb/s    ARP type: ARPA, ARP Timeout 04:00:00    Last input 00:00:04, output never, 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: fifo    Output queue: 0/40 (size/max)    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 input packets with dribble condition detected       0 packets output, 0 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  
SW2
  • SW2配置与SW1相同,以下为简写配置过程。
SW2#conf t  SW2(config)#no ip routing  SW2(config)#int f1/0  SW2(config-if)#spe 100  SW2(config-if)#du f  SW2(config-if)#do show int f1/0  FastEthernet1/0 is up, line protocol is up    Hardware is Fast Ethernet, address is c202.5d60.f100 (bia c202.5d60.f100)    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)    Full-duplex, 100Mb/s    ARP type: ARPA, ARP Timeout 04:00:00    Last input 00:00:01, output never, 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: fifo    Output queue: 0/40 (size/max)    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 input packets with dribble condition detected       0 packets output, 0 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  

PING 测试

配置 IP 地址
PC1> ip 192.168.10.10 255.255.255.0  Checking for duplicate address...  PC1 : 192.168.10.10 255.255.255.0  
PC2> ip 192.168.10.20  Checking for duplicate address...  PC1 : 192.168.10.20 255.255.255.0  
PING
PC1> ping 192.168.10.20  84 bytes from 192.168.10.20 icmp_seq=1 ttl=64 time=1.884 ms  84 bytes from 192.168.10.20 icmp_seq=2 ttl=64 time=1.838 ms  84 bytes from 192.168.10.20 icmp_seq=3 ttl=64 time=0.947 ms  84 bytes from 192.168.10.20 icmp_seq=4 ttl=64 time=1.835 ms  84 bytes from 192.168.10.20 icmp_seq=5 ttl=64 time=0.846 ms  
PC2> ping 192.168.10.10  84 bytes from 192.168.10.10 icmp_seq=1 ttl=64 time=0.922 ms  84 bytes from 192.168.10.10 icmp_seq=2 ttl=64 time=0.954 ms  84 bytes from 192.168.10.10 icmp_seq=3 ttl=64 time=1.846 ms  84 bytes from 192.168.10.10 icmp_seq=4 ttl=64 time=1.846 ms  84 bytes from 192.168.10.10 icmp_seq=5 ttl=64 time=0.995 ms  

最后

交换机之间双工速率匹配如上,下一篇关于静态路由实验。

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