#FAST ETHERNET STATUS UP PROTOCOL DOWN HOW TO#
#FAST ETHERNET STATUS UP PROTOCOL DOWN FULL#
#FAST ETHERNET STATUS UP PROTOCOL DOWN PC#

Switch-to-switch or switch-to-router connections required using different Ethernet cables. Until recently, certain cable types (straight-through or crossover) were required when connecting devices. The video and interactive content described in this chapter are only available to students enrolled in related Cisco Networking Academy courses and not in this sample.

#FAST ETHERNET STATUS UP PROTOCOL DOWN FULL#

In Figure 2-8 and Table 2-4, port F0/1 on switch S1 and S2 are manually configured with the full keyword for the duplex command and the 100 keyword for the speed command. Use the speed interface configuration mode command to manually specify the speed for a switch port. Use the duplex interface configuration mode command to manually specify the duplex mode for a switch port. Switch ports can be manually configured with specific duplex and speed settings.

#FAST ETHERNET STATUS UP PROTOCOL DOWN HOW TO#

This section examines how to configure specific parameters on a Cisco switch port and introduces auto-MDIX.

#FAST ETHERNET STATUS UP PROTOCOL DOWN PC#

Just as a network card in a PC can have specific conditions such as duplex and speed set, so too can a switch port. Configure Switch Ports at the Physical Layer (2.1.2.2) This results in a 200 percent potential use of the stated bandwidth. Full-duplex offers 100 percent efficiency in both directions (transmitting and receiving). Standard, shared hub-based Ethernet configuration efficiency is typically rated at 50 to 60 percent of the stated bandwidth. Full-duplex connections require a switch that supports full-duplex configuration, or a direct connection using an Ethernet cable between two devices. Frames that are sent by the two connected devices cannot collide because the devices use two separate circuits in the network cable. In full-duplex mode, the collision detection circuit on the NIC is disabled. Gigabit Ethernet and 10Gb NICs require full-duplex connections to operate.

Most Ethernet and Fast Ethernet NICs sold today offer full-duplex capability. Full-duplex communication has replaced half-duplex in most hardware. Half-duplex connections are typically seen in older hardware, such as hubs. Half-duplex communication creates performance issues because data can flow in only one direction at a time, often resulting in collisions. Sending and receiving data does not occur at the same time. Unlike full-duplex communication, half-duplex communication is unidirectional. Because there is only one device connected, a micro-segmented LAN is collision free. This results in a micro size collision domain of a single device.

A micro-segmented LAN is created when a switch port has only one device connected and is operating at full-duplex. This method of optimizing network performance requires micro-segmentation. This is also known as bidirectional communication. Full-duplex communication increases effective bandwidth by allowing both ends of a connection to transmit and receive data simultaneously. Full-duplex communication improves the performance of a switched LAN.

Fast ethernet status up protocol down