191
The NTK feature drops any unicast frame with an unknown destination MAC address. Not all port
security modes support triggering the NTK feature. For more information, see Table 15.
To configure the NTK feature:
1. Enter system view.
N/A
2. Enter
interface view.
interface
interface-type
interface-number
N/A
3. Configure the NTK feature.
port-security ntk-mode
{
ntk-withbroadcasts
|
ntk-withmulticasts
|
ntkonly
}
By default, NTK is disabled on a
port and all frames are allowed to
be sent.
Configuring intrusion protection
Intrusion protection enables a device to take one of the following actions in response to illegal
frames:
• blockmac—Adds the source MAC addresses of illegal frames to the blocked MAC address list
and discards the frames. All subsequent frames sourced from a blocked MAC address are
dropped. A blocked MAC address is restored to normal state after being blocked for 3 minutes.
The interval is fixed and cannot be changed.
• disableport—Disables the port until you bring it up manually.
• disableport-temporarily—Disables the port for a period of time. The period can be configured
with the port-security timer disableport command.
To configure the intrusion protection feature:
1. Enter system view.
N/A
2. Enter
interface view.
interface
interface-type
interface-number
N/A
3.
protection feature.
port-security intrusion-mode
{
blockmac
|
disableport
|
}
By default, intrusion protection is
disabled.
4. Return to system view.
quit
N/A
5.
(Optional.) Set the silence
timeout period during which
a port remains disabled.
port-security timer
disableport
time-value
By default, the port silence
timeout is 20 seconds.
On a port operating in either macAddressElseUserLoginSecure mode or
macAddressElseUserLoginSecureExt mode, intrusion protection is triggered only after both MAC
authentication and 802.1X authentication fail for the same frame.
Configuring secure MAC addresses
Secure MAC addresses are configured or learned in autoLearn mode. If the secure MAC addresses
are saved, they can survive a device reboot. You can bind a secure MAC address only to one port in
a VLAN.
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