Port security implements two traffic filtering methods, dynamic locking and static locking. These methods can be used concurrently. … Note: If you want to set a specific MAC address for a port, set the dynamic entries to 0, then allow only packets with a MAC address matching the MAC address in the static list.
What are three methods of implementing port security?
Three possible modes are available:
- Protect: – This mode will only work with sticky option. …
- Restrict: – In restrict mode frames from non-allowed address would be dropped. …
- Shutdown: – In this mode switch will generate the violation alert and disable the port. …
- Switch(config)# errdisable recovery cause psecure-violation.
How does port security identify a device?
Port security uses the MAC address to identify allowed and denied devices. By default, port security allows only a single device to connect through a switch port. You can, however, modify the maximum number of allowed devices.
What are the steps involved to configure port security How do we see a security violation?
How do we see a security violation? Todisplaytheport securityconfiguration on an interface, use theshow port-securitycommand. Shutdown – When aviolationoccurs in thismode, the switchport will be taken out of service and placed in the err-disabled state.
What are the three types of port security?
On Cisco equipment there are three different main violation types: shutdown, protect, and restrict.
Can we configure port security on trunk ports?
Port security supports trunks. –On a trunk, you can configure the maximum number of secure MAC addresses both on the trunk and for all the VLANs on the trunk. –You can configure the maximum number of secure MAC addresses on a single VLAN or a range of VLANs.
Which command will enable port security?
Use the switchport port-security command to enable port-security. I have configured port-security so only one MAC address is allowed. Once the switch sees another MAC address on the interface it will be in violation and something will happen.
What is port security aging?
The inactivity aging feature prevents the unauthorized use of a secure MAC address when the authorized user is offline. The feature also removes outdated secure MAC addresses so that new secure MAC addresses can be learned or configured.
How do I enable port security on a dynamic port?
1) Your switch interface must be L2 as “port security” is configure on an access interface. You can make your L3 switch port to an access interface by using the “switchport” command. 2) Then you need to enable port security by using the “switchport port-security” command.
Which attacks can be avoided by port security features?
Port Security feature can protect the switch from MAC flooding attacks. Port security feature can also protect the switch from DHCP starvation attacks, where a client start flooding the network with very large number of DHCP requests, each using a different source MAC address.
Is port security enabled by default?
By default, a port security violation forces the interface into the error-disabled state. An administrator must re-enable the port manually by issuing the shutdown interface command followed by no shutdown .