Port security is used to mitigate mac address spoofing at the access interface. With the default port security configuration, to brin g all secure ports out of the errordisabled state, enter the errdisable recovery cause psecureviolation global configuration command, or manually reenable the port by entering the shutdown and no shut down interface configuration commands. Port security features, understanding how to protect access ports from common attacks, configuring port security els, configuring port security nonels, example. To configure port security, take the following general actions. For example, you cannot create bookmarks and hyperlinks using the adobe pdf printer. Overview of port security techlibrary juniper networks. Nist sp 800128 assumes that information security is an integral part of an organizations overall configuration management. It provides guidelines, procedures, and configuration examples. Port security guidelines and restrictions when configuring port security, follow these guidelines. Learn how to secure a switch port with switchport security feature step by step.
However, on a perport basis, you can configure security measures to block unauthorized connections or listening, and to send notice of security violations. This enables individual ports to detect, prevent, and log attempts by unauthorized devices to communicate through the switch. Port security is easy to configured and it allows you to secure access to a port based upon a mac address basis. Although only a single interface is used for illustration in this article, port security, if configured, is typically configured on all userfacing interfaces. Lets now see the basic portsecurity configuration on cisco switches. Its called port security and you can use it to limit the number of mac addresses per interface or even to specify which mac address can connect to each physical port of the switch. Once the mac limit has exceeded the maximum configured value on a port, all traffic from the. In the following example port mac security is globally enabled on a device, secure mac addresses are saved to the startup configuration every 20 minutes and timed out after 60 minutes. With the default port security configuration, to brin g all secure ports out of the errordisabled state. Port security configuration on cisco switch using packet.
The mac address of a host generally does not change. Determine the options for setting port security on interface fastethernet 04. Port security helps secure the network by preventing unknown devices from forwarding packets. Do not configure port security on a span destination port. However, in the cisco ios, switch ports are referred to as interfaces as well.
Configuring and monitoring port security planning port security planning port security 1. This tutorial explains switchport security modes protect, restrict and shutdown, sticky address, mac address, maximum number of hosts and switchport security violation rules in detail with examples. Sw1 con0 is now available press return to get started. It describes where log files are located, how to retrieve them, and how to make sure that they use a format that can be read and analyzed by security reporting center. To enable port security on a specific port you use the switchport portsecurity command in interface configuration mode as shown below. Do not configure span destination on a secure port. The implications and reasoning behind this action are explained in the next chapter. Basic switch configuration and port security danscourses. Switchport security concepts and configuration cisco press. You can use port security to block input to an ethernet, fast ethernet, or gigabit ethernet port when the mac address of the station attempting to access the. To practice and learn to configure port security on cisco switch, just download the port security packet tracer lab or create your own lab and follow the switch port security configuration guideline. The firewall configuration guide provides information about how to configure supported firewalls, proxy servers, and security devices to work with security reporting center.
Enter the clear portsecurity dynamic global configuration command to clear all dynamically learned secure addresses. Configuring port security on a given switch port automatically enables eavesdrop prevention for that port. Figure 41port security follow these steps to configure port security. Using port security, you can configure each switch port with a unique list of the mac addresses of devices that are authorized to access the network through that port. Configuring sticky switchport security free ccna workbook. Port security cannot be enabled on the member port of a lag, and the port with port. When configuring port security, follow these guidelines. Enable portsecurity on sw1 interface fa01 and allow a maximum of 3 mac addresses. Mar 11, 2016 the mac address learned on the port can also be added to the running configuration of that port. Switch security overview in the video tutorials below, i show how to use packet tracer to build a small lan with a cisco 2960 switch, three pc clients, and two pc servers, one of the servers is placed on a separate vlan for management purposes. When configuring port security, there are a few things to keep in mind. However, a best practice for basic switch configuration is to change the management vlan to a vlan other than vlan 1.
Create a basic switch configuration, including a name and an ip address configure passwords to ensure that access to the cli is secured configure switch port speed and duplex properties for an interface configure basic switch port security manage the mac address table assign static mac addresses. Cisco switch port security configuration and best practices. That is, any device can access a port without causing a security reaction. With the default port security configuration, to bring all secure ports out of the error. In the apic, the user can configure the port security on switch ports. With the default port security configuration, to bring all secure ports out of the. Enable portsecurity on sw1s fa01 interface and configure the interface to sticky the mac address learned.
Used in configuration mode to limit messages that are logged to the syslog servers based on severity. We can view the default port security configuration with show port security. First, we need to enable port security and define which mac addresses are allowed to send frames. Which devices mac addresses are authorized on each port and how many devices do you want to allow per port up to 8. Cisco offers you different tools, like dhcp snooping. Step 6 copy runningconfig startupconfig save the settings in the configuration file. Next, we will enable dynamic port security on a switch. Understanding how port security works port security configuration guidelines configuring port security on the switch monitoring port security understanding how port security works. Guide for securityfocused configuration management of.
This prevents use of the port to flood unicast packets addressed to mac addresses unknown to the switch and blocks unauthorized users from eavesdropping on traffic intended for addresses that have agedout of the switch address table. To configure port security, three steps are required. If you enable switch port security, the default behavior is to allow only 1 mac address, shutdown the port in case of security violation and sticky address learning is disabled. If the port violates the port security, we can shutdown that port automatically. Switch port configuration traditionally, network connections on switches have been referred to as ports, while on routers they are referred to as interfaces. Verify port security is enabled and the mac addresses of pc1 and pc2 were added to the running configuration with show run command. This feature enables you to configure each switch port with a unique list of the mac addresses of devices that are authorized to access. Configuring and monitoring port security ftp directory listing. Mar 29, 2020 this article describes how to configure switch port security on cisco switches.
Port security uses the vlan id configured with the switchport trunk native vlan. Configures the ip address of the host that will receive the system logging syslog messages. Using port security, you can configure each switch port with a unique list of the mac addresses of devices that are authorized to access the network through that. To configure port security we need to access the command prompt of switch.
If youre creating a pdf from a microsoft office document and you want to use these features, use pdfmaker. Plan your port security configuration and monitoring according to the following. Use port security show commands to display configuration information. Configuring dynamic switchport security free ccna workbook. Port security guidelines and restrictions follow these guidelines when configuring port security. The default port security setting for each port is off. What is port security and how does it work with my managed switch.
Default port security configuration table 621 shows the default port security configuration for an interface. Do not configure dynamic, static, or permanent cam entries on a secure port. From privilege exec mode use configure terminal command to enter in global configuration mode. One of the most overlooked security areas is the configuration of individual switchport security configuration. Configuring port security the configuration commands.
To enable port security on an interface, use the switchport port security command in interface configuration mode. Port security can also configured locally and has no mechanism for controlling port security in a centralized fashion for distributed switches. When you are working as a network engineer or network administrator the main problem you facing is the security of switch. To view port security configuration and status for a specific interface. Convert vce to pdf exam formatter vce mobile tutorial terms of service privacy policy billing policy. Cisco switch port security commands the tech factors. Configuration management concepts and principles described in nist sp 800128, provide supporting information for nist sp 80053, recommended security controls for federal information systems and organizations. An example of configuring port security on a static trunk port is shown. Port security is not designed to protect against these attacks. After the abovementioned steps are performed, you can enter the address of the switch in the web browser to access the switch.
The default configuration of a cisco switch has port security disabled. The reason may be that it requires a more granular configuration. May 06, 2007 port security configuration guidelines. Windows for microsoft office documents, the adobe pdf printer does not include some of the features that are available from pdfmaker. Emc vnx series security configuration guide for vnx describes security settings and configuration for embedded nas. What is port security and how does it work with my managed. We can protect switch by enabling password and console password protectio. Emc vnx series command line interface reference for file describes cli commands to manage access control, certificates, ldap configuration, and other security related activities for embedded nas. Port security configurations 41 managing physical interface 4 port security configurations 4. The continue reading basic switch configuration and port security.
Following these steps to enable and configure port security. Port security is included in the cisco ccent exam, but 802. The following example shows the configuration of port security on a cisco switch. Refer to configuring source guard in the cisco nxos security configuration guide for more information about this feature. Default port security configuration table 261 shows the default port security configuration for an interface. This section lists the guidelines for configuring port security. How to configure switch port security on cisco switches. Learn how to protect switches from mac address table poisoning by configuring a cisco catalyst series switch to use a feature called port security.
Configure switch port speed and duplex properties for an interface. To configure the desired port security violation action. This tutorial explains switchport security modes protect, restrict and shutdown, sticky address, mac address, maximum number of hosts and. Port security adds an additional layer of security to the switching network. However, since you can limit the device on a port, it will be hard for a hacker to starve your server. To enable portsecurity youll execute the switchport portsecurity command as previously learned in lab 419. How to configure and verify switch port security examcollection. The port security interface configuration mode command enables port security on an interface. Port security can use dynamically learned sticky mac addresses to facilitate the initial configuration.
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