179
Step Command
Remarks
4.
Set the port security mode.
port-security
port-mode
{
autolearn
|
mac-authentication
|
mac-else-userlogin-secure
|
mac-else-userlogin-secure-ext
|
secure
|
userlogin
|
userlogin-secure
|
userlogin-secure-ext
|
userlogin-secure-or-mac
|
userlogin-secure-or-mac-ext
|
userlogin-withoui
}
By default, a port operates in
noRestrictions mode.
After enabling port security, you
can change the port security mode
of a port only when the port is
operating in noRestrictions (the
default) mode. To change the port
security mode for a port in any
other mode, first use the
undo
port-security port-mode
command
to restore the default port security
mode.
Configuring port security features
Configuring NTK
The NTK feature checks the destination MAC addresses in outbound frames to make sure frames are
forwarded only to authenticated devices.
The NTK feature supports the following modes:
•
ntkonly
—Forwards only unicast frames with authenticated destination MAC addresses.
•
ntk-withbroadcasts
—Forwards only broadcast frames and unicast frames with authenticated
destination MAC addresses.
•
ntk-withmulticasts
—Forwards only broadcast frames, multicast frames, and unicast frames with
authenticated destination MAC addresses.
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
.
To configure the NTK feature:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
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
