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Configuring port security
Overview
Port security combines and extends 802.1X and MAC authentication to provide MAC-based network
access control. It applies to a network that requires different authentication methods for different users on
a port.
Port security prevents unauthorized access to the network by checking the source MAC address of
inbound traffic and prevents access to unauthorized devices by checking the destination MAC address
of outbound traffic.
Port security can control MAC address learning and authentication on a port to make sure that the port
learns only trusted MAC addresses.
A frame is illegal, if its source MAC address cannot be learned in a port security mode or it is from a
client that has failed 802.1X or MAC authentication.
The port security feature can automatically take a pre-defined action on illegal frames. This automatic
mechanism enhances network security and reduces human intervention.
NOTE:
For scenarios that require only 802.1X authentication or MAC authentication, HP recommends you
configure 802.1X authentication or MAC authentication rather than port security. For more information
about 802.1X and MAC authentication, see "Configuring 802.1X" and "Configuring MAC
authentication
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Port security features
NTK
The need to know (NTK) feature prevents traffic interception by checking the destination MAC address in
the outbound frames. The feature guarantees that frames are sent only to hosts that have passed
authentication or whose MAC addresses have been learned or configured on the access device.
Intrusion protection
The intrusion protection feature checks the source MAC address in inbound frames for illegal frames and
takes a pre-defined action on each detected illegal frame. The action can be disabling the port
temporarily, disabling the port permanently, or blocking frames from the illegal MAC address for three
minutes (not user configurable).
Port security traps
You can configure the port security module to send traps for port security events such as login, logoff, and
MAC authentication. These traps help you monitor user behaviors.
Port security modes
Port security supports the following categories of security modes:
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