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• Authentication—Security modes in this category implement MAC authentication, 802.1X
authentication, or a combination of these two authentication methods.
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. By default, outgoing frames of a port are not restricted
by port security. Only when they trigger the NTK feature, are they restricted by the predefined NTK
action.
The maximum number of users a port supports equals the maximum number of secure MAC addresses
that port security allows or the maximum number of concurrent users the authentication mode in use
allows, whichever is smaller. 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 5 de
scribes the port security modes and the security features.
Table 5 Port security modes
Purpose
Security mode
Features that can be
tri
ered
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
macAddressElseUserLoginSecureExt
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