Table of Contents
- 1 How do I enable port-security on an interface?
- 2 How do I enable port-security?
- 3 What is the default action of port-security on the interface?
- 4 What does Switchport port security do?
- 5 What are the 3 port security violation modes for a switch?
- 6 What is Switchport port security?
- 7 Why would you enable port security on a switch?
- 8 Which port security command enabled this feature?
- 9 How to enable port security on a switch?
- 10 What happens if a port is configured as a secure port?
- 11 What are the guidelines for Cisco port security?
How do I enable port-security on an interface?
To configure port security, three steps are required:
- define the interface as an access interface by using the switchport mode access interface subcommand.
- enable port security by using the switchport port-security interface subcommand.
How do I enable port-security?
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. This can also be applied in a range of the interfaces on a switch or individual interfaces.
What mode must you place the interface into before you are able to configure port-security on the interface?
What mode must you place the interface into before you are able to configure Port Security on the interface? Before you can configure Port Security on a port, you must first put the port in access mode by using the port-security mode access command.
What is the default action of port-security on the interface?
By default, only 1 MAC address is allowed by the Cisco switch on a single port and if any other device tries to connect using that port, switch automatically shutdown its port to restrict unauthorized access. To increase the number of users on a single port, ‘switchport port-security maximum 5’ command is executed.
What does Switchport port security do?
Overview. The switchport security feature (Port Security) is an important piece of the network switch security puzzle; it provides the ability to limit what addresses will be allowed to send traffic on individual switchports within the switched network.
What are the port security violation modes?
You can configure the port for one of three violation modes: protect, restrict, or shutdown.
What are the 3 port security violation modes for a switch?
Switchport Violations On Cisco equipment there are three different main violation types: shutdown, protect, and restrict. These are described in more detail below: Shutdown – When a violation occurs in this mode, the switchport will be taken out of service and placed in the err-disabled state.
What is Switchport port security?
Which circumstance causes a security violation on a switch port with port security enabled?
Switch Port Security It is a security violation when either of these situations occurs: The maximum number of secure MAC addresses have been added to the address table for that interface, and a station whose MAC address is not in the address table attempts to access the interface.
Why would you enable port security on a switch?
The main reason to use port security in a switch is to stop or prevent unauthorized users to access the LAN.
Which port security command enabled this feature?
switchport port security example
| Command | Description |
|---|---|
| Switch(config-if)#switchport port-security | Enable port security feature on this port |
| Switch(config-if)#switchport port-security maximum 1 | Set limit for hosts that can be associated with interface. Default value is 1. Skip this command to use default value. |
Why should you implement port security on a switch interface?
The main reason to use port security in a switch is to stop or prevent unauthorized users to access the LAN. To stop unauthorized telnet or SSH access to a management interface the switch must be secured with passwords at the command line, with the VTY console command.
How to enable port security on a switch?
2) Then you need to enable port security by using the “switchport port-security” command. This can also be applied in a range of the interfaces on a switch or individual interfaces. 3) This step is optional, but you can specify how many MAC addresses the switch can have on one interface at a time.
What happens if a port is configured as a secure port?
If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs.
How to see port security details per interface?
Use show port-security interface to see the port security details per interface. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). Shutting the interface after a security violation is a good idea (security-wise) but the problem is that the interface will stay in err-disable state.
What are the guidelines for Cisco port security?
Port Security Configuration Guidelines 1 Port security can only be configured on static access ports or trunk ports. 2 A secure port cannot be a destination port for Switched Port Analyzer (SPAN). 3 Voice VLAN is only supported on access ports and not on trunk ports, even though the configuration is allowed.