Accton Technology VS4512DC manual Configuring Port Security, Command Usage

User Authentication.

CLI – This example enables SSH, sets the authentication parameters, and displays the current configuration. It shows that the administrator has made a connection via SHH, and then disabled this connection.

Console(config)#ip		ssh server		4-31
Console(config)#ip		ssh timeout 100		4-35
Console(config)#ip		ssh authentication-retries 5		4-33
Console(config)#
Console#show ip ssh				4-34
Information of secure shell
SSH status: enable
SSH authentication		timeout: 100
SSH authentication		retries: 5
Console#show ssh				4-35
Information of secure shell
Session Username Version Encrypt method Negotiation state
------- -------- ------- -------------- -----------------
0	admin	1.5	cipher-3des session-started
Console#disconnect		ssh 0		4-16
Console#

Configuring Port Security

Port security is a feature that allows you to configure a switch port with one or more device MAC addresses that are authorized to access the network through that port.

When port security is enabled on a port, the switch stops learning new MAC addresses on the specified port. Only incoming traffic with source addresses already stored in the dynamic or static address table will be accepted as authorized to access the network through that port. If a device with an unauthorized MAC address attempts to use the switch port, the intrusion will be detected and the switch can automatically take action by disabling the port and sending a trap message.

To use port security, first allow the switch to dynamically learn the <source MAC address, VLAN> pair for frames received on a port for an initial training period, and then enable port security to stop address learning. Be sure you enable the learning function long enough to ensure that all valid VLAN members have been registered on the selected port. Note that you can also restrict the maximum number of addresses that can be learned by a port.

To add new VLAN members at a later time, you can manually add secure addresses with the Static Address Table (page 3-73),or turn off port security to reenable the learning function long enough for new VLAN members to be registered. Learning may then be disabled again, if desired, for security.

Command Usage

•A secure port has the following restrictions:

-It cannot use port monitoring.

-It cannot be a multi-VLAN port.

-It cannot be used as a member of a static or dynamic trunk.

-It should not be connected to a network interconnection device.

•If a port is disabled (shut down) due to a security violation, it must be manually re-enabled from the Port/Port Configuration page (page 3-42).

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