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New Member

security-violation error in 3750

We Have a strange behavior with the computer of a user who connects with his laptop to the network through port replicator or docking station,Where we have a acs.When he goes to another place of the company in another City, Where we have other acs, he connects without port replicator directly to network,It works well. But when the laptop returns does not have

network and the following message of error in switch appears:

May 16 07:51:23: %DOT1X-5-SECURITY_VIOLATION: Security violation on interface FastEthernet1/0/27, New MAC address 00c0.f200.53f0 is seen on the interface in Single Host mode

May 16 07:51:23: %PM-4-ERR_DISABLE: security-violation error detected on Fa1/0/27, putting Fa1/0/27 in err-disable state

May 16 07:51:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/27, changed state to down

May 16 07:51:25: %LINK-3-UPDOWN: Interface FastEthernet1/0/27, changed state to down

I execute the commando "shutdown" and "not shutdown" in the interface of switch, and soon the commando: "dot1x port-control auto" and soon "not dot1x port-control auto". laptop make authentication and begins to work well.

What think you about What this occurring?

2 REPLIES
New Member

Re: security-violation error in 3750

Hi,

Is there any port security being set on the switch?

are you able to paste your config file here?

thanks,

rgds,

ken L

New Member

Re: security-violation error in 3750

I attach config

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