![]() ![]() For instance, if you have good reason to configure the speed and duplex on a port, maybe add a description that says why you did. The description text interface subcommand lets you add a text description to the interface. For instance, maybe you want to set the speed to the fastest possible on links between switches just to avoid the chance that auto-negotiation chooses a slower speed. Most of the time, using autonegotiation makes good sense, so when you set the duplex and speed, you typically have a good reason to do so. However, you can configure the speed and duplex settings with the duplex interface subcommands. Switch interfaces that support multiple speeds (10/100 and 10/100/1000 interfaces), by default, will autonegotiate what speed to use. ![]() The second half then shows how to add a security feature called port security, which monitors the source MAC address of incoming frames, deciding which frames are allowed and which cause a security violation. In this lesson, you pick up tools that loosely fit in the switch control plane.įirst, this lesson shows how you can configure and change the operation of switch interfaces: how to change the speed, duplex, or even disable the interface. ![]() You learned about the primary purpose of a switch-forwarding Ethernet frames-and learned how to see that process in action by looking at the switch MAC address table.Īfter learning about the switch data plane in the lesson, “ Analyzing Ethernet LAN Switching,” you learned a few management plane features in the lesson, “ Configuring Basic Switch Management,” like how to configure the switch to support Telnet and Secure Shell (SSH) by configuring IP address and login security. So far, you have learned the skills to navigate the command-line interface (CLI) and use commands that configure and verify switch features. ![]()
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