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Upon receiving a frame, the port in a security mode searches the MAC address table for the source
MAC address. If a match is found, the port forwards the frame. If no match is found, the port learns
the MAC address or performs authentication, depending on the security mode. If the frame is illegal,
the port takes the predefined NTK or intrusion protection action, or sends SNMP notifications.
Outgoing frames are not restricted by port security's NTK action unless they trigger the NTK feature.
The maximum number of users a port supports equals the smaller value from the following values:
• The maximum number of secure MAC addresses that port security allows.
• The maximum number of concurrent users the authentication mode in use allows.
For example, if 802.1X allows more concurrent users than port security's limit on the number of MAC
addresses on the port in userLoginSecureExt mode, port security's limit takes effect.
Table 17 de
scribes the port security modes and the security features.
Table 17 Port security modes
Purpose Security mode
Features that can
be triggered
Turning off the port security
feature
noRestrictions (the default mode)
In this mode, port security is disabled on the port
and access to the port is not restricted.
N/A
Controlling MAC address
learning
autoLearn
NTK/intrusion
protection
secure
Performing 802.1X
authentication
userLogin N/A
userLoginSecure
NTK/intrusion
protection
userLoginSecureExt
userLoginWithOUI
Performing MAC authentication macAddressWithRadius
NTK/intrusion
protection
Performing a combination of
MAC authentication and
802.1X authentication
Or
macAddressOrUserLoginSecure
NTK/intrusion
protection
macAddressOrUserLoginSecureExt
Else
macAddressElseUserLoginSecure
macAddressElseUserLoginSecureE
xt
TIP:
• userLogin specifies 802.1X authentication and port-based access control. userLogin with
Secure specifies 802.1X authentication and MAC-based access control. Ext indicates allowing
multiple 802.1X users to be authenticated and serviced at the same time. A security mode
without Ext allows only one user to pass 802.1X authentication.
• macAddress specifies MAC authentication.
• Else specifies that the authentication method before Else is applied first. If the authentication
fails, whether to turn to the authentication method following Else depends on the protocol type o
the authentication request.
• Or specifies that the authentication method following Or is applied first. If the authentication fails,
the authentication method before Or is applied.
Controlling MAC address learning
• autoLearn.
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