Switch port security sticky mac

To enable sticky learning, enter the switchport port-security mac-address sticky command. When you enter this 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. The sticky secure MAC addresses do not automatically become part of the configuration file, which is the startup configuration used each time the switch restarts. If you save the sticky secure MAC addresses in the configuration file, when the switch restarts, the interface does not need to relearn these addresses.

If you do not save the configuration, they are lost. If sticky learning is disabled, the sticky secure MAC addresses are converted to dynamic secure addresses and are removed from the running configuration. After the maximum number of secure MAC addresses is configured, they are stored in an address table.

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Port security

To ensure that an attached device has the full bandwidth of the port, configure the MAC address of the attached device and set the maximum number of addresses to one, which is the default. Note When a Catalyst series switch port is configured to support voice as well as port security, the maximum number of allowable MAC addresses on this port should be changed to three.

A security violation occurs if the maximum number of secure MAC addresses has been added to the address table and a workstation whose MAC address is not in the address table attempts to access the interface. You can configure the interface for one of these violation modes, based on the action to be taken if a violation occurs:. The rate at which SNMP traps are generated can be controlled by the snmp-server enable traps port-security trap-rate command.

The default value "0" causes an SNMP trap to be generated for every security violation. This is the default mode.

Configuring Sticky Switchport Security | Free CCNA Workbook

You can also customize the time to recover from the specified error disable cause default is seconds by entering the errdisable recovery interval interval command. To restrict traffic through a port by limiting and identifying MAC addresses of the stations allowed to access the port, perform this task:. Sets the interface mode as access; an interface in the default mode dynamic desirable cannot be configured as a secure port. Optional Sets the maximum number of secure MAC addresses for the interface.

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The range is 1 to ; the default is 1. Optional Sets the violation mode, the action to be taken when a security violation is detected, as one of these:. Note 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 reenable it by entering the shutdown and no shut down interface configuration commands.

Optional Enters a secure MAC address for the interface. You can use this command to enter the maximum number of secure MAC addresses. The interface converts the sticky secure MAC addresses to dynamic secure addresses. To delete all the sticky addresses on an interface or a VLAN, use the no switchport port-security sticky interface interface-id command.

The address keyword enables you to clear a secure MAC addresses. The interface keyword enables you to clear all secure addresses on an interface. This example shows how to enable port security on Fast Ethernet port 12 and how to set the maximum number of secure addresses to 5. The violation mode is the default, and no secure MAC addresses are configured. You can use port security aging to set the aging time and aging type for all secure addresses on a port.

Use this feature to remove and add PCs on a secure port without manually deleting the existing secure MAC addresses while still limiting the number of secure addresses on a port. Enters interface configuration mode for the port on which you want to enable port security aging.

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The static keyword enables aging for statically configured secure addresses on this port. If the time is equal to 0, aging is disabled for this port. The type keyword sets the aging type as absolute or inactive. For absolute aging, all the secure addresses on this port ago out exactly after the time minutes specified and are removed from the secure address list.

Port Security 2

For inactive aging, the secure addresses on this port ago out only if there is no data traffic from the secure source address for the specified time period. Subsequently, Operations asked us to turn on port security to discourage server admins from moving Ethernet cables to other switch ports. Something like:. A couple of servers subsequently had problems.


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In most if not all cases, they were dual-homed to Cisco switches in a VSS pair. Testing suggested the problem. The other half is that the learned MAC addresses cannot be used on any other port. Although if you think about it, that is actually an even more effective form of what we thought we intended. A few of the servers were set up for active — passive failure form of teaming.

Connected to VSS switch pairs. Port security event, packets dropped or port shutdown. That is probably a good exercise of your basic switch understanding. The EtherChannel is currently hard-coded on.


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  3. Switchport Security Configuration;
  4. Port Security.

In moving to a new switch, what can go wrong? They could be:.


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  • The one that seems the most interesting to me, anyway is 1. What is the problem with it?