Cisco Catalyst C3850 Series User Manual

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Port LEDs and Modes
Each Ethernet port, 1-Gigabit Ethernet module slot, and 10-Gigabit Ethernet module slot has a port LED.
These port LEDs, as a group or individually, display information about the switch and about the individual
ports. The port mode determines the type of information shown by the port LEDs.
To select or change a mode, press the Mode button until the desired mode is highlighted. When you change
port modes, the meanings of the port LED colors also change.
When you press the Mode button on any switch in the switch stack, all the stack switches change to show the
same selected mode. For example, if you press the Mode button on the active switch to show the SPEED
LED, all the other switches in the stack also show the SPEED LED.
Table 5: Port Mode LEDs
DescriptionPort ModeMode LED
The port status. This is the default mode.Port statusSTAT
The port operating speed: 10, 100, or 1000 Mb/s.Port speedSPEED
The port duplex mode: full duplex or half duplex.Port duplex modeDUPLX
The active switch status.ActiveACTV
Stack member status.
The StackWise port status. See STACK LED, on page 20.
Stack member status
StackWise port status
STACK
The PoE+ port status.The PoE+ port status.PoE
9
9
Only switches with PoE+ ports.
Table 6: Meaning of Switch LED Colors in Different Modes
MeaningPort LED ColorPort Mode
No link, or port was administratively shut down.OffSTAT (port status)
Link present, no activity.Green
Activity. Port is sending or receiving data.Blinking green
Link fault. Error frames can affect connectivity, and errors
such as excessive collisions, CRC errors, and alignment
and jabber errors are monitored for a link-fault indication.
Alternating green-amber
Port is blocked by Spanning Tree Protocol (STP) and is
not forwarding data.
After a port is reconfigured, the port LED can be amber
for up to 30 seconds as STP checks the switch for possible
loops.
Amber
Catalyst 3850 Switch Hardware Installation Guide
17OL-26779-05
Product Overview
Port LEDs and Modes

Cisco Catalyst C3850 Series Specifications

General

Max Stacking Units	9
Layer Support	Layer 2 and Layer 3
RAM	4 GB
Flash Memory	4 GB
Series	Catalyst 3850
Power Supply Options	AC or DC
Software	Cisco IOS XE
Operating Temperature	32 to 113°F (0 to 45°C)
Ports	12, 24, or 48 x 10/100/1000 Ethernet ports
Uplink Interfaces	Optional 10G uplinks