关于err-disabled情况问题的正确答案？谢谢！

dongzhifei_nsn

Whichcondition does the err-disabled status indicate on an Ethernet interface?

A. Thereis a duplex mismatch.

B.The device at the other end of the connection is powered off.

C.The serial interface is disabled.

D.The interface is configured with the shutdown command.

E.Port security has disabled the interface.

F.The interface is fully functioning.

有的题库是A，有的题库是E，A和E好像都能导致err-disabled状态，到底哪个选项正确？

Lensual

刚才再真机上实验了，答案是E。

A，手动指定双工模式，log输出内容
00:18:36: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/12 (not half duplex), with Switch FastEthernet0/11 (half duplex).
00:18:36: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/11 (not full duplex), with Switch FastEthernet0/12 (full duplex).


#sh interfaces status
Fa0/11                     connected    1            half    100 10/100BaseTX
Fa0/12                     connected    1            full    100 10/100BaseTX




E，手动设置了端口安全，绑定了mac，mac不符合的时候log输出
00:20:05: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 0011.9253.2c0c on port Fa0/11.
00:20:05: %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/11, putting Fa0/11 in err-disable state


#sh interfaces status
Fa0/11                     err-disabled 1            half    100 10/100BaseTX
Fa0/12                     notconnect   1            full    100 10/100BaseTX

ghostfoetus

2个也出现在官网里头，
http://www.cisco.com/c/en/us/sup ... -recovery.html#anc8

但正常应该选port security~
因为这样是比较多见，

而duplex mismatch 却可能已经被cdp 所告知而有packet loss 或者line protocol down.

ackca

双工不匹配不会造成err-disable吧

Rockyw

A的话应该是down吧，不是err-disabled

dongzhifei_nsn

楼主很严谨，值得学习！