When configuring port security, follow these guidelines: Port Security Guidelines and Restrictions The port shuts down when the maximum number of secure MAC addresses is exceeded, and an SNMP trap notification is sent. Table 54-1 shows the default port security configuration for an interface. If you enter a write memory or copy running-config startup-config command, then port security with sticky MAC addresses saves dynamically learned MAC addresses in the startup-config file and the port does not have to learn addresses from ingress traffic after bootup or a restart. Port security with sticky MAC addresses retains dynamically learned MAC addresses during a link-down condition. Port security with sticky MAC addresses provides many of the same benefits as port security with static MAC addresses, but sticky MAC addresses can be learned dynamically. To ensure that an attached device has the full bandwidth of the port, set the maximum number of addresses to one and configure the MAC address of the attached device. See the "Configuring Port Security" section. You can configure the port for one of three violation modes: protect, restrict, or shutdown. If the port has a link-down condition, all dynamically learned addresses are removed.įollowing bootup, a reload, or a link-down condition, port security does not populate the address table with dynamically learned MAC addresses until the port receives ingress traffic.Ī security violation occurs if the maximum number of secure MAC addresses have been added to the address table and the port receives traffic from a MAC address that is not in the address table. You can statically configure a number of addresses and allow the rest to be dynamically configured.You can allow the port to dynamically configure secure MAC addresses with the MAC addresses of connected devices.You can statically configure all secure MAC addresses by using the switchport port-security mac-address mac_address interface configuration command.See the "Configuring the Port Security Violation Mode on a Port" section for more information about the violation modes.Īfter you have set the maximum number of secure MAC addresses on a port, port security includes the secure addresses in the address table in one of these ways: Note After a secure MAC address is configured or learned on one secure port, the sequence of events that occurs when port security detects that secure MAC address on a different port in the same VLAN is known as a MAC move violation. If traffic with a secure MAC address that is configured or learned on one secure port attempts to access another secure port in the same VLAN, applies the configured violation mode.When the maximum number of secure MAC addresses is reached on a secure port and the source MAC address of the ingress traffic is different from any of the identified secure MAC addresses, port security applies the configured violation mode.If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the device attached to that port has the full bandwidth of the port.Ī security violation occurs in either of these situations: When you assign secure MAC addresses to a secure port, the port does not forward ingress traffic that has source addresses outside the group of defined addresses. You can use port security with dynamically learned and static MAC addresses to restrict a port's ingress traffic by limiting the MAC addresses that are allowed to send traffic into the port. Port Security with Dynamically Learned and Static MAC Addresses Port Security with Sticky MAC Addresses.Port Security with Dynamically Learned and Static MAC Addresses.Port Security Guidelines and Restrictions.The system will not install a JRE that has an earlier version than the current version.Note For complete syntax and usage information for the commands used in this chapter, see the Cisco IOS Software Releases 12.2SX Command References at this URL: When you install the JRE, you can install only one JRE on your system at a time. To install an earlier version of the JRE, you must first uninstall the current version. To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. However, the system will not replace the current JRE with a lower version. When you install the JDK, it also installs the JRE. Administrator privileges are required to install the JDK and JRE on macOS. Installing the JDK and JRE on macOS is performed on a systemwide basis for all users. You cannot install Java for a single user. The following are the system requirements for installing the JDK and the JRE on macOS:
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