Default Port Security Configuration; Configuration Guidelines - Cisco Catalyst 3750 Software Configuration Manual

Chapter 18 Configuring Port-Based Traffic Control

Default Port Security Configuration

Table 18-2
Table 18-2 Default Port Security Configuration
Feature
Port security
Sticky address learning
Maximum secure MAC addresses per port
Violation mode
Port security aging

Configuration Guidelines

Follow these guidelines when configuring port security:
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78-15870-01
shows the default port security configuration for an interface.
Port security can only be configured on static access ports or trunk ports. A secure port cannot be a
dynamic access port.
A secure port cannot be a destination port for Switched Port Analyzer (SPAN).
A secure port cannot belong to a Fast EtherChannel or a Gigabit EtherChannel port group.
You cannot configure static secure or sticky secure MAC addresses in the voice VLAN.
Note Voice VLAN is only supported on access ports and not on trunk ports, even though the
configuration is allowed.
When you enable port security on an interface that is also configured with a voice VLAN, you must
set the maximum allowed secure addresses on the port to two plus the maximum number of secure
addresses allowed on the access VLAN. When the port is connected to a Cisco IP phone, the IP
phone requires up to two MAC addresses. The IP phone address is learned on the voice VLAN and
might also be learned on the access VLAN. Connecting a PC to the IP phone requires additional
MAC addresses.
If any type of port security is enabled on the access VLAN, dynamic port security is automatically
enabled on the voice VLAN. You cannot configure port security on a per-VLAN basis.
When a voice VLAN is configured on a secure port that is also configured as a sticky secure port,
all addresses on the voice VLAN are learned as dynamic secure addresses, and all addresses seen
on the access VLAN to which the port belongs are learned as sticky secure addresses.
When you enter a maximum secure address value for an interface, and the new value is greater than
the previous value, the new value overwrites the previously configured value. If the new value is
less than the previous value and the number of configured secure addresses on the interface exceeds
the new value, the command is rejected.
The switch does not support port security aging of sticky secure MAC addresses.
Default Setting
Disabled on a port.
Disabled.
1.
Shutdown. The port shuts down when the maximum
number of secure MAC addresses is exceeded.
Disabled. Aging time is 0.
Static aging is disabled.
Type is absolute.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring Port Security
18-9