Cisco Catalyst 3750 Metro Command Reference Manual page 744

switchport port-security
You cannot configure static secure or sticky secure MAC addresses in the voice VLAN.
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When you enable port security on an interface that is also configured with a voice VLAN, set the
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maximum allowed secure addresses on the port to two. When the port is connected to a Cisco IP
phone, the IP phone requires one MAC address. The Cisco IP phone address is learned on the voice
VLAN, but is not learned on the access VLAN. If you connect a single PC to the Cisco IP phone,
no additional MAC addresses are required. If you connect more than one PC to the Cisco IP phone,
you must configure enough secure addresses to allow one for each PC and one for the Cisco IP
phone.
If any type of port security is enabled on the access VLAN, dynamic port security is automatically
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enabled on the voice VLAN. You cannot configure port security on a per-VLAN basis.
Note
• 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.
• You cannot configure static secure MAC addresses in the voice VLAN.
• When you enter a maximum secure address value for an interface, if the new value is greater than
the previous value, the new value overrides 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.
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A security violation occurs when the maximum number of secure MAC addresses are in the address table
and a station whose MAC address is not in the address table attempts to access the interface, or when a
station whose MAC address is configured as a secure MAC address on another secure port attempts to
access the interface.
When a secure port is in the error-disabled state, you can bring it out of this state by entering the
errdisable recovery cause psecure-violation global configuration command, or you can manually
re-enable it by entering the shutdown and no shut down interface configuration commands.
Setting a maximum number of addresses to one and configuring the MAC address of an attached device
ensures that the device has the full bandwidth of the port.
When you enter a maximum secure address value for an interface, this occurs:
If the new value is greater than the previous value, the new value overrides the previously configured
•
value.
If the new value is less than the previous value and the number of configured secure addresses on
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the interface exceeds the new value, the command is rejected.
Sticky secure MAC addresses have these characteristics:
When you enable sticky learning on an interface by using the switchport port-security
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mac-address sticky interface configuration command, the interface converts all the dynamic secure
MAC addresses, including those that were dynamically learned before sticky learning was enabled,
to sticky secure MAC addresses and adds all sticky secure MAC addresses to the running
configuration.
Catalyst 3750 Metro Switch Command Reference
2-716
Voice VLAN is supported only on access ports and not on trunk ports.
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
OL-9645-10