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Embed code for: 05.4 Starting the Switch and Observing the LED Indicators
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05.4 Starting the Switch and Observing the LED Indicators
9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/5/pages/4 1/3 Starting the Switch and Observing the LED Indicators Section 5: Starting a Switch Typically, before turning on a device, you need to plug it in. However, some Cisco switches do not have power switches, so when you plug them in, they power up automatically. Because of this fact, you should make sure that you have the console cable connected and the terminal program running before you plug in the switch the first time. This preparation will allow you to monitor the boot process of the switch. As the switch powers on, it begins POST, a series of tests that run automatically to ensure that the switch functions properly. Ensuring the switch passes POST is the first step of deploying a switch. When you need to examine how a switch is working to verify its current status and to troubleshoot any problems, the vast majority of the time is spent using commands from the Cisco IOS CLI. However, the switch hardware does include several LEDs that provide some status and troubleshooting information. Generally, when the Cisco switch is functioning normally, the LEDs are lit in green, and if there is a malfunction, the LEDs are lit in amber. The figure here shows the front of a Cisco Catalyst 3750 switch, with six LEDs on the left, one LED over each port, and a mode button. LED Status Number in Figure Name Description 1 SYST Implies the overall system status. 2 RPS Suggests the status of the extra (redundant) power supply. 3 STAT If on (green), implies that each port LED implies the status of that port. 4 DUPLX If on (green), each port LED implies the duplex of that port (on is full; off means half). 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/5/pages/4 2/3 Number in Figure Name Description 5 SPEED If on (green), each port LED implies the speed of that port, as follows: off means 10 Mb/s, solid green means 100 Mb/s, and flashing green means 1 Gb/s. 6 PoE Some switches have a PoE LED in the system status group of LEDs. This LED indicates the perport and system PoE status. 7 MODE A button that cycles the meaning of the LEDs through three states (STAT, DUPLX, SPEED). 8 Port Has different meanings, depending on the port mode as toggled using the mode button. To help make sense of the LEDs, consider the example of the SYST LED for a moment. This LED provides a quick overall status of the switch, with three simple states on most Cisco Catalyst 2960 switch models: Off: The switch is not powered on. On (green): The switch is powered on and operational (Cisco IOS Software has been loaded). On (amber): The switch POST process failed and the Cisco IOS Software did not load. So, just looking at the SYST LED on the switch tells you whether the switch is working and, if it is not, whether this is due to a loss of power (the SYST LED is off) or some kind of POST problem (the LED is amber). Click the Play Button to watch a short video about Cisco catalyst switch LED indicators. Up Next: Configuring a Switch from the Command Line 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/5/pages/4 3/3