SMC Networks SMC8624/48T manual Configuring Port Security

CONFIGURING THE SWITCH

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 disables this connection.

Console(config)#ip		ssh server		3-48
Console(config)#ip		ssh timeout 100		3-49
Console(config)#ip		ssh authentication-retries 5		3-50
Console(config)#ip		ssh server-key size 512		3-51
Console(config)#end
Console#show ip ssh				3-54
SSH Enabled - version 2.0
Negotiation timeout: 120 secs; Authentication retries: 3
Server key size: 768 bits
Console#show ssh				3-55
Information of secure shell
Session Username Version Encrypt method Negotiation state
------- -------- ------- -------------- -----------------
0	admin	2.0	cipher-3des session-started
Console#disconnect		0		3-24
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.

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