Security Measures
172
Instruction Manual - NXA-ENET8-POE+
Perform these steps to show a list of IP addresses authorized for management access:
1.
Click
Security
>
IP Filter
.
2.
Select
Show
from the Action list.
Configuring Port Security
Use the Security > Port Security page to configure the maximum number of device MAC addresses that can be learned by a switch
port, stored in the address table, and authorized to access the network.
When port security is enabled on a port, the switch stops learning new MAC addresses on the specified port when it has reached a
configured maximum number. Only incoming traffic with source addresses already stored in the address table will be 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.
Command Usage
The default maximum number of MAC addresses allowed on a secure port is zero (that is, disabled). To use port security,
you must configure the maximum number of addresses allowed on a port.
To configure the maximum number of address entries which can be learned on a port, and then specify the maximum
number of dynamic addresses allowed. The switch will learn up to the maximum number of allowed address pairs <source
MAC address, VLAN> for frames received on the port. When the port has reached the maximum number of MAC addresses,
the port will stop learning new addresses. The MAC addresses already in the address table will be retained and will not be
aged out.
Note that you can manually add additional secure addresses to a port using the Static Address Table (page 97).
When the port security state is changed from enabled to disabled, all dynamically learned entries are cleared from the
address table.
If port security is enabled, and the maximum number of allowed addresses are set to a non-zero value, any device not in the
address table that attempts to use the port will be prevented from accessing the switch.
If a port is disabled (shut down) due to a security violation, it must be manually re-enabled from the Interface > Port >
General page (page 61).
A secure port has the following restrictions:
It cannot be used as a member of a static or dynamic trunk.
It should not be connected to a network interconnection device.
RSPAN and port security are mutually exclusive functions. If port security is enabled on a port, that port cannot be set
as an RSPAN uplink port. Also, when a port is configured as an RSPAN uplink port, source port, or destination port, port
security cannot be enabled on that port.
The following table lists the options on this page:
FIG. 202
Showing IP Addresses Authorized for Management Access
Security - Port Security Options
Port
Port identifier. (Range: 1-10/26/28/52)
Security Status
Enables or disables port security on a port. (Default: Disabled)
Port Status
The operational status:
• Secure/Down - Port security is disabled.
• Secure/Up - Port security is enabled.
• Shutdown - Port is shut down due to a response to a port security violation.
Action
Indicates the action to be taken when a port security violation is detected:
• None: No action should be taken. (This is the default.)
• Trap: Send an SNMP trap message.
• Shutdown: Disable the port.
• Trap and Shutdown: Send an SNMP trap message and disable the port.
Max MAC Count
The maximum number of MAC addresses that can be learned on a port. (Range: 0 - 1024, where 0
means disabled)
The maximum address count is effective when port security is enabled or disabled.
Current MAC Count
The number of MAC addresses currently associated with this interface.
MAC Filter
Shows if MAC address filtering has been set under Security > Network Access (Configure MAC
Filter) as described on page 148.