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What is port security MAC address?
The port security feature offers the following benefits: You can limit the number of MAC addresses on a given port. Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure packets) are restricted. You can enable port security on a per port basis.
Can a port have more than one MAC address?
You can have more than one MAC address on a switch port if: You have a switch connected to it. Could be another managed switch (like a Cisco) or an unmanaged switch (like a consumer Netgear or Linksys switch). You have a virtual server host attached to it with multiple virtual machines sharing the NIC.
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 are the types of port security?
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.
Is there a maximum number of MAC addresses for port security?
If the entire global resource of 1024 MAC addresses is used on some ports, you can still enable port security on the rest of the ports with a maximum of one MAC per port. If you reduce the maximum number of MAC addresses, the system clears the specified number of MAC addresses and displays the list of removed addresses.
What happens when you assign a secure MAC address?
When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port.
How to configure port security on Cisco routers?
• 901 (1 + 900) on one port, 101 (1 + 100) on another port, 25 (1 + 24) on a third port, and 1 address on each of the rest of the ports After you allocate the maximum number of MAC addresses on a port, you can either specify the secure MAC address for the port manually or have the port dynamically configure the MAC address of the connected devices.
When do MAC addresses on a port become insecure?
After you allocate a maximum number of MAC addresses on a port, you can also specify how long the addresses on the port will remain secure. After the age time expires, the MAC addresses on the port become insecure. By default, all addresses on a port are secured permanently.