2、DUPLEX_MISMATCH 报错解决方案
Mar 1 01:11:40.707: íP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not half duplex), with R3 FastEthernet0/1 (half duplex). 路由提示
*Mar 1 01:20:14.287: íP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1 (not full duplex), with SW1 FastEthernet0/0 (full duplex). 解决办法一:
进入不匹配的端口， (config-if)#duplex full (config-if)#speed 100 解决办法二:
进入交换机或路由的全局配置模式 #conf t
(conf)#no cdp run !关闭cdp的运行.
这样就不会出现网卡半双半和全双工不匹配的烦人提示.
但关闭再#show cdp neighbors就看不到邻居了，再启用cdp就可以了！
3、查看trunk：
查看VLAN：
SW#show vlan-switch
拓扑文件：.net
autostart = false
[localhost] port = 7200 udp = 10000
workingdir = ..\\tmp\\
[[router SW1]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 3640 console = 3001 ram = 128
confreg = 0x2102 exec_area = 64 mmap = false
slot1 = NM-16ESW
f1/0 = PC1 f0/0 f1/1 = PC2 f0/0 f1/2 = SW3 f1/2 f1/3 = SW2 f1/2 f1/4 = R1 s1/0
[[router SW2]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 3640 console = 3002 ram = 128
confreg = 0x2102 exec_area = 64 mmap = false slot1 = NM-16ESW f1/0 = PC3 f0/0 f1/1 = PC4 f0/0 f1/3 = SW4 f1/3 f1/4 = R2 s1/0
[[router SW3]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 3640 console = 3003 ram = 128
confreg = 0x2102 exec_area = 64 mmap = false
slot1 = NM-16ESW f1/0 = PC5 f0/0 f1/1 = PC6 f0/0 f1/3 = SW4 f1/2 f1/4 = R1 s1/1
[[router SW4]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 3640 console = 3004 ram = 128
confreg = 0x2102 exec_area = 64
mmap = false slot1 = NM-16ESW f1/0 = PC7 f0/0 f1/1 = PC8 f0/0 f1/4 = R2 s1/1
[[router R1]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 7200 console = 3005 nep = nep-400 ram = 64
confreg = 0x2102 exec_area = 64 mmap = false slot1 = PA-2FE-TX
[[router R2]]
image = ..\\ios\%unzip-c7200-is-mz.122-37.bin model = 7200 console = 3006 npe = npe-400 ram = 64
confreg = 0x2102 exec_area = 64 mmap = false slot1 = PA-2FE-TX
[[router PC1]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3007
[[router PC2]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102
console = 3008
[[router PC3]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3009
[[router PC4]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3010
[[router PC5]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3011
[[router PC6]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3012
[[router PC7]] model = 2621 ram = 20 image = ..\\ios\%unzip-c2600-i-mz.121-3.T.bin mmap = False confreg = 0x2102 console = 3013
[[router PC8]]