如何查看和解决cisco交换机的报警？
第一种解决办法：cisco3550/3560交换机经常出现以下报警日志，经常刷屏：
Mar 1 09:21:54.207 BeiJing: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/21 (91), with Switch FastEthernet0/1 (1).
*Mar 1 09:22:06.439 BeiJing: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/9 (86), with Switch FastEthernet0/1 (1).
*Mar 1 09:22:30.343 BeiJing: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/13 (86), with Switch FastEthernet0/1 (1).
*Mar 1 09:22:32.199 BeiJing: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/5 (86), with Switch FastEthernet0/1 (1).
*Mar 1 09:22:35.679 BeiJing: %SYS-5-CONFIG_I: Configured from console by vty0 (220.185.123.95)
经过分析，主要原因是：cisco3550/3560交换机下面接有没有做过任何配置的cisco交换机引起，造成CDP-4-NATIVE_VLAN_MISMATCH日志和Native VLAN mismatch discovered报错。
解决方法：
在cisco3550/3560交换机报警端口，通过添加命令 no cdp enable解决
interface FastEthernet0/1
switchport access vlan 86
switchport mode access
switchport protected
switchport block multicast
switchport block unicast
no cdp enable
还有一种解释：
造成该问题的原因是：某台交换机的trunk接口与另一台交换机的Access接口互联了，这样就导致此现象。技术分析为trunk接口可以带标签传输VLAN信息，该信息在进入另一台交换机的Access接口时，需要重新打标签。但标签已重复了。
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