Cisco port security 2 mac address

I want allow the same set of mac address on different ports and tried the following switchport port-security switchport port-security maximum 2.
Table of contents

Configures the encapsulation, which configures the Layer 2 switching port as either an ISL or Note A port in the default mode dynamic desirable cannot be configured as a secure port. Optional Sets the violation mode and the action to be taken when a security violation is detected. Router config-if no switchport port-security violation. When configuring port security violation modes, note the following information:. Note The truncated switching mode does not support the port security rate limiter. Port security examines all traffic received by secure ports to detect violations or to recognize and secure new MAC addresses.

When the shutdown violation mode is configured, traffic cannot enter the secure port after a violation has been detected, which removes the possibility that violations might cause excessive CPU load. When the protect or restrict violation modes are configured, port security continues to process traffic after a violation occurs, which might cause excessive CPU load.

Configure the port security rate limiter to protect the CPU against excessive load when the protect or restrict violation modes are configured. Router config no mls rate-limit layer2 port-security.


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  • Configuring Port Security.
  • Switchport Security Concepts and Configuration.

When configuring the port security rate limiter, note the following information:. The rate limiter is applied to traffic both before and after a security violation occurs. Configure a value high enough to permit nonviolating traffic to reach the port security feature. To configure the maximum number of secure MAC addresses on a port, perform this task:. Router config-if no switchport port-security maximum. When configuring the maximum number of secure MAC addresses on a port, note the following information:.

To enable port security with sticky MAC addresses on a port, perform this task:. Router config-if switchport port-security mac-address sticky. Router config-if no switchport port-security mac-address sticky. When enabling port security with sticky MAC addresses, note the following information:. When configuring a static secure MAC address on a port, note the following information:.

switch - Cisco port security static vs sticky+static - Network Engineering Stack Exchange

This example shows how to configure a MAC address When the aging type is configured with the absolute keyword, all the dynamically learned secure addresses age out when the aging time expires. When the aging type is configured with the inactivity keyword, the aging time defines the period of inactivity after which all the dynamically learned secure addresses age out.

You can configure the secure MAC address aging type on a port. The link you posted is out of date. Cisco has many docs stating it does support trunk port security. Port security removes all secure addresses on the voice VLAN of the access port. Q6-support The maximum number of secure MAC addresses that you can configure on a switch is set by the maximum number of available MAC addresses allowed in the system. Static port MAC address assignments are supported A is wrong. EtherChanel port-channel…. Maximum of three sticky MAC addresses is wrong D is wrong.

SPAN port are not supported E is wrong. This question is badly documented and it is not possible to give two certain answers.


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How is the port configured? Impossible found this question on certification test. This command allow switch to learn the first MAC address that comes into on the interface. Which configuration do you apply to an interface so that it uses port security to learn and commit the first MAC address?

Configure the switchport switch-port security violation restrict 1 command. Enable the sticky MAC addresses feature. Enable the static secure MAC addresses feature. Configure the switch for port-security aging type inactivity command.

Configuring Port Security

Configure the switchport port-security maximum 1 command. Disable the sticky MAC addresses feature. Use ping command to generate frames. One interesting thing that you may notice here is the type. This is the magic of sticky option, which we used with port security command.

Cisco Port Security and Sticky MAC Addresses

Sticky option automatically converts dynamically learned address in static address. In our topology we have one additional PC. Assume that, this is the cracker's PC. To gain unauthorized access in network he unplugged the Ethernet cable from pc PC0 and plugged in his pc PC1. Click red X button on the right hand partition of packet tracer window and place the X over the connection between Switch and PC0.

This will remove the connection. Click lightning bolt button on the bottom left-handed corner and click copper straight—through connection.

What happened this time? Why ping command did not get response from server? Because switch detected the mac address change and shutdown the port. When an interface is down due to port security violation, we have two options to bring it back. First is following global configuration mode command. Second option is manually restart the interface. Unplugged cable from unauthorized pc and plugged back it to authorized pc.

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Sticky Port Situations

Switchport Port Security Explained With Examples This tutorial explains Switchport security modes Protect, Restrict and Shutdown , sticky address, mac address, maximum number of hosts and Switchport security violation rules in detail with examples. Default value is 1. Skip this command to use default value. Switch config-if switchport port-security violation shutdown Set security violation mode.