Cisco 3560 mac address table static

Go to Solution. The "clear mac address-table" command won't help here as these MACs are being learned by the port-security feature.

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If you want to clear them try the following command:. I don't understand why your mac addresses are appearing as static because that should only be for mac addresses you have configured manually. Hi Julio. That command worked fine. Tks Although as soon as I connect the laptop behind a VoIP phone with port-security enabled, the MAC Address of the laptop is kept in the interface mac address table even if I disconnect the laptop from the port, even if I wait 10minutes, 1 hour, 1 day..

So I was unable to reconnect the laptop on the same switch because the switch already learned the mac address in the first port. It's only working when I manually clear the mac address from the port, but I guess the switch should learn and forget the connected mac addresses dynamically.. I was reviewing the switch config and I've got ports with aging time 0 that learn and flush the mac addresses dynamically and I've got ports with aging time 1 that learn and flush the mac addresses at the end of 60 seconds.

The problem is solved although I need to investigate this issue in other switch models and with other voip phones.

Restrict PC's to use static IP address using cisco switch 3560

If you haven't then you shouldn't need to do anything because those mac addresses should be dynamically learnt in which case when you disconnect the device they should be flushed from the mac address table. The aging time is only needed for static entries and when you want to time out mac entries even though a device is not being disconnected. Find A Community. Speak French? Now you can ask your questions in the new French Community!

Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. All community This category This board. Cisco Community : Technology and Support : Networking : Switching : can't clear mac address table from inte All hosts on a local network specify the IP address of the local router interface in their IP configuration. This router interface is the default gateway. Routers also serve the following beneficial functions, as shown in Figure :.

Figure Router Functions.

Selecting Network Devices (1.2)

With the enterprise and the ISP, the ability to route efficiently and recover from network link failures is critical to delivering packets to their destination. As the network grows, it is important to select the proper routers to meet its requirements.

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As shown in Figure , there are three categories of routers:. Figure Router Platforms. Routers also come in many form factors, as shown in Figure Network administrators in an enterprise environment should be able to support a variety of routers, from a small desktop router to a rack-mounted or blade model. Figure Routing Devices. Routers can also be categorized as fixed configuration or modular. With the fixed configuration, the desired router interfaces are built in. Modular routers come with multiple slots that allow a network administrator to change the interfaces on the router.

As an example, a Cisco router comes with two Fast Ethernet RJ interfaces built in and two slots that can accommodate many different network interface modules. Network administrators are responsible for managing these devices. This includes initial configuration, verification, and troubleshooting tasks as well as maintaining up-to-date images and backing up the configuration files. With such a wide selection of network devices to choose from in the Cisco product line, an organization can carefully determine the ideal combination to meet the needs of the employees and the customers.

When selecting or upgrading a Cisco IOS device, it is important to choose the proper IOS image with the correct feature set and version. IOS refers to the package of routing, switching, security, and other internetworking technologies integrated into a single multitasking operating system. When a new device is shipped, it comes preinstalled with the software image and the corresponding permanent licenses for the customer-specified packages and features.

Regardless of the Cisco IOS network device being implemented, there are two methods for connecting a PC to that network device for configuration and monitoring tasks. These methods include out-of-band and in-band management , as shown in Figure Out-of-band management is used for initial configuration or when a network connection is unavailable. Configuration using out-of-band management requires. In-band management is used to monitor and make configuration changes to a network device over a network connection.

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Configuration using in-band management requires. A basic router configuration includes the host name for identification, passwords for security, assignment of IP addresses to interfaces for connectivity, and basic routing. Assuming that the physical interfaces are connected to the network, Example shows the commands entered to enable a router with OSPF. Verify and save configuration changes using the copy running-config startup-config command. Example shows the results of the configuration commands that were entered in Example To clear the router configuration, use the erase startup-config command and then the reload command.

Here are some of the most commonly used IOS commands to display and verify the operational status of the router and related network functionality. These commands are divided into several categories. If specified without a specific interface designation, all interfaces will be displayed. If a specific interface is specified after the command, information about that interface only will be displayed.

If a specific interface is specified after the command as shown in Example , information about that interface only will be displayed. Other connectivity-related commands include the show cdp neighbors command shown in Example Basic switch configuration includes the host name for identification, passwords for security, and assignment of IP addresses for connectivity. In-band access requires the switch to have an IP address. Example shows the commands entered to enable a switch.

show mac address-table / show mac-address-table - - The Cisco Learning Network

Verify and save the switch configuration using the copy running-config startup-config command. To clear the switch configuration, use the erase startup-config command and then the reload command. It might also be necessary to erase any VLAN information using the delete flash:vlan. When switch configurations are in place, view the configurations using the show running-config command.

Switches make use of common IOS commands for configuration, to check for connectivity, and to display current switch status. For example, the following commands are useful for gathering some important information:. To examine a specific interface, include the interface ID, as shown in Example I was thinking in terms of the exam, I am sure I will find a way through, just thought its something that could cause a slip up - but being aware of the differences cant hurt at all.

Scott showed an example that resembles the output of my switches. I would like to know what is the purpose of the mac addresses that are bound to the CPU in the mac address table, and why are there so many? In my switch there are 20 addresses that are statically bound to the CPU, and one of them is the broadcast address. Notice that these addresses are present even when I have not statically assigned any addresses to any interfaces, and I have no computers connected to the switch to learn the addresses automatically. I would really like to understand why they exist?

I am assuming that in an exam you could use the question mark or if it is just a question and not a simulator then it does not matter if they have a hypen or not.

SWITCH 300-115

A quick question for you. Would that just be from multple PCs plugging into that port or is something else causing that? Please let me know. I belive this could be due to a Hub or a non cisco switch connected with many PC's connected to it. Or a trunk to another switch. Either would be correct. Switch sh mac-address-table Mac Address Table