System information

Configuring Security
Configuring Port Security
Cisco Small Business 200 Series Smart Switch Administration Guide 175
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• Storm Control Mode—Select one of the modes:
- Unknown Unicast, Multicast & Broadcast—Counts unknown Unicast,
Broadcast, and Multicast traffic together towards the bandwidth
threshold.
- Multicast & Broadcast—Counts Broadcast and Multicast traffic together
towards the bandwidth threshold.
- Broadcast Only—Counts only Broadcast traffic towards the bandwidth
threshold.
STEP 4 Click Apply. Storm control is modified, and the switch is updated.
Configuring Port Security
Network security can be increased by limiting access on a port to users with
specific MAC addresses. The MAC addresses can be either dynamically learned
or statically configured.
Port security monitors received and learned packets. Access to locked ports is
limited to users with specific MAC addresses.
Port Security has two modes:
• Classic Lock—All learned MAC addresses on the port are locked, and the
port does not learn any new MAC addresses. The learned addresses are not
subject to aging or re-learning.
• Limited Dynamic Lock—The switch learns MAC addresses up to the
configured limit of allowed addresses. After the limit is reached the switch
does not learn additional addresses. In this mode, the addresses are subject
to aging and re-learning.
When a frame from a new MAC address is detected on a port where it is not
authorized (the port is classically locked, and there is a new MAC address, or the
port is dynamically locked, and the maximum number of allowed addresses has
been exceeded), the protection mechanism is invoked, and one of the following
actions can take place:
• Frame is discarded
• Frame is forwarded