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Catalyst 3850 Switch Hardware Installation Guide
OL-26779-02
Chapter 1 Product Overview
Front Panel
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. Table 1-5
lists the mode LEDs and their associated port modes and meanings.
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. Table 1-6 explains how to interpret
the port LED colors in different port modes.
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 1-5 Port Mode LEDs
Mode LED Port Mode Description
STAT Port status The port status. This is the default mode.
SPEED Port speed The port operating speed: 10, 100, or 1000 Mb/s.
DUPLX Port duplex mode The port duplex mode: full duplex or half duplex.
ACTV Active The active switch status.
STACK Stack member status
StackWise port status
The stack member status.
The StackWise port status. See the “STACK LED” section on
page 1-14.
PoE
1
1. Only switches with PoE+ ports.
PoE+ port power The PoE+ port status.
Table 1-6 Meaning of Switch LED Colors in Different Modes
Port Mode Port LED Color Meaning
STAT
(port status)
Off No link, or port was administratively shut down.
Green Link present, no activity.
Blinking green Activity. Port is sending or receiving data.
Alternating
green-amber
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.
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.
