1-13
Description
Use the port-security ntk-mode command to configure the NTK feature on the port.
Use the undo port-security ntk-mode command to restore the default setting.
Be default, NTK is disabled on a port, namely all frames are allowed to be sent.
By checking the destination MAC addresses of the data frames to be sent from a port, the NTK feature
ensures that only successfully authenticated devices can obtain data frames from the port, thus
preventing illegal devices from intercepting network data.
Examples
# Set the NTK feature to ntk-withbroadcasts on Ethernet 1/0/1.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] port-security enable
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] port-security ntk-mode ntk-withbroadcasts
port-security oui
Syntax
port-security oui OUI-value index index-value
undo port-security oui index index-value
View
System view
Parameters
OUI-value: OUI value. You can input a 48-bit MAC address in the form of H-H-H for this argument and
the system will take the first 24 bits as the OUI value and ignore the rest.
index-value: OUI index, ranging from 1 to 16.
The organizationally unique identifiers (OUIs) are assigned by the IEEE to different vendors. Each OUI
uniquely identifies an equipment vendor in the world and is the higher 24 bits of a MAC address.
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