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Port Security
This section describes the Port Security feature.
Overview
Port Security:
• Allows for limiting the number of MAC addresses on a given port.
• Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure
packets) are restricted.
• Enabled on a per port basis.
• When locked, only packets with allowable MAC address will be forwarded.
• Supports both dynamic and static.
• Implement two traffic filtering methods. These methods can be used concurrently.
– Dynamic Locking: User specifies the maximum number of MAC addresses that can be learned on
a port. The maximum number of MAC addresses is 100. After the limit is reached, additional
MAC addresses are not learned. Only frames with an allowable source MAC address are forwarded.
– Static Locking: User manually specifies a list of static MAC addresses for a port.
Operation
Port Security:
• Helps secure network by preventing unknown devices from forwarding packets.
• When link goes down, all dynamically locked addresses are ‘freed.’
• If a specific MAC address is to be set for a port, set the dynamic entries to 0, then only allow packets
with a MAC address matching the MAC address in the static list.
• Dynamically locked MAC addresses are aged out if another packet with that address is not seen within
the age-out time. The user can set the time-out value.
• Dynamically locked MAC addresses are eligible to be learned by another port.
• Static MAC addresses are not eligible for aging.