If the switch receives packets with a nonexistent source MAC address after the number of secure MAC addresses reaches the limit, the switch considers that the packets are sent from an unauthorized user and takes the configured action on the interface. By default, the switch discards the packets and generates an alarm in such a situation.
Discards packets with a nonexistent source MAC address and generates an alarm. This action is recommended.
By default, an interface cannot automatically restore to Up state after it is shut down. To restore the interface, run the undo shutdown command on the interface in sequence. Alternatively, run the restart command on the interface to restart the interface.
To ensure access device security and defend against attacks from unauthorized users, configure port security on the interface of RouterA. As shown in Figure , multiple PCs communicate with the switch through RouterA on a tree network. To ensure aggregation device security and limit the number of access users, configure port security on the aggregation device Router and set the maximum number of secure MAC addresses. An interface can learn only one secure MAC address by default.
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Set the maximum number of secure MAC addresses according to actual networking. This function prevents unauthorized users from communicating with the industrial switch router using this interface and therefore enhances device security. You can configure port security on networks demanding high access security. In this case, the router can only communicate with devices with learned MAC addresses.
Understanding and Using Persistent MAC Learning
This prevents devices with untrusted MAC addresses from communicating with the industrial switch router through this interface, improving security of the device and network. Run the display mac-address security [ vlan vlan-id interface-type interface-number ] command to check dynamic secure MAC address entries. For high user access security, port security is enabled on the interface of the router and the maximum number of MAC addresses to be learned on the interface is set to the number of access users so that external users cannot use their PCs to access the company network.
Dynamic secure MAC addresses will be lost after a device restart and need to be learned again.
Action to Take After the Number of Secure MAC Addresses Reaches the Limit If the switch receives packets with a nonexistent source MAC address after the number of secure MAC addresses reaches the limit, the switch considers that the packets are sent from an unauthorized user and takes the configured action on the interface. The access device configured with port security can defend against attacks initiated by an unauthorized user using another interface. The aggregation device configured with port security can limit the number of access users.
If access users frequently change the locations, you can configure port security to convert dynamic MAC addresses into dynamic secure MAC addresses. This function ensures that bound MAC address entries are deleted immediately when users change the locations.
Cisco CCNA – Port Security and Configuration – utamisimup.tk
Will convert all dynamically learned MAC addresses to sticky MAC addresses so that you don't have to statically define them like if you had a couple hundred hosts. Simply allows you to ensure that one is added statically as you already know.
Overview of Port Security
Statically defined MACs are also preserved in the configuration, so after a reboot they would not need to be relearned. From Configuring Port Security. You can configure an interface to convert the dynamic MAC addresses to sticky secure MAC addresses and to add them to the running configuration by enabling sticky learning. 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. So in your configurations case, you statically defining those MAC addresses is just redundant, anything learned on that port will be converted to a sticky MAC anyway.
- Configuring Persistent MAC Learning (ELS)!
- Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.2(20)EWA;
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- Understanding Persistent MAC Learning (Sticky MAC).
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