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关于网络故障的全面分析排除实战

方法2:如果不是这个问题怎么办?如果用户使用的是14号端口又该怎么办?既然有连接,说明网是通的。下一步应该怎么办?在交换机上使用show interface fastethernet 0/14 命令。显示如表B所列。

列表B

Switch# show interface fa0/14

FastEthernet0/14 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 0014.1c40.b08e (bia 0014.1c40.b08e)

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, media type is 100BaseTX

input flow-control is unsupported output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, 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: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 2000 bits/sec, 3 packets/sec

96848 packets input, 8083322 bytes, 0 no buffer

Received 9293 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

323210 input errors, 123123 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 133 multicast, 0 pause input

0 input packets with dribble condition detected

10061627 packets output, 866400040 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 babbles, 0 late collision, 2 deferred

132 lost carrier, 20 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

Switch#

通过表B,我们可以发现尽管网络可以连接,但存在一些第一层的问题。

方法3:如果这个端口有网络连接而且没有问题该怎么办呢?接下来就应该查看第二层。请看例子

Switch#show mac address-table interface fastEthernet 0/14

硬件地址表

Vlan 硬件地址 类型 端口号

1 00c0.b768.5409 DYNAMIC Fa0/14

Total Mac Addresses for this criterion: 1

Switch#

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