14-2
Configuring and Monitoring Port Security
Port Security
Port Security
Basic Operation
Default Port Security Operation. The default port security setting for
each port is off, or “continuous”. That is, any device can access a port without
causing a security reaction.
Intruder Protection. A port that detects an “intruder” blocks the intruding
device from transmitting to the network through that port.
Eavesdrop Protection. Using either the port-security command or the
switch’s WebAgent to enable port security on a given port automatically
enables eavesdrop prevention on that port.
General Operation for Port Security. On a per-port basis, you can
configure security measures to block unauthorized devices, and to send notice
of security violations. Once port security is configured, you can then monitor
the network for security violations through one or more of the following:
■ Alert flags that are captured by network management tools such as PCM+
■ Alert Log entries in the WebAgent
■ Event Log entries in the console interface
■ Intrusion Log entries in the menu interface, CLI, or WebAgent
For any port, you can configure the following:
■ Action: Used when a port detects an intruder. Specifies whether to send
an SNMP trap to a network management station and whether to disable
the port.
■ Address Limit: Sets the number of authorized MAC addresses allowed
on the port.
■ Learn-Mode: Specify how the port acquires authorized addresses.
• Continuous: Allows the port to learn addresses from inbound traffic
from any connected device. This is the default setting.
• Limited-Continuous: Sets a finite limit (1 - 32) to the number of
learned addresses allowed per port.
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