Cisco Systems OL-16447-01 manual Alarm LEDs, Dual-Purpose Port LEDs, LED Color Meaning

Chapter 1 Product Overview

Front Panel

Alarm LEDs

Table 1-8	Alarm LEDs
Color		System Status
Off		No alarm
Amber		Minor alarm
Red		Major alarm
Blinking red		Critical alarm

Port LEDs

Each RJ-45 port and SFP-module slot has a port LED. These port LEDs, as a group or individually, display information about the switch and about the individual ports.

Table 1-9 Meaning of Port LED Colors

LED Color	Meaning
Off	No link, or port was administratively shut down.
Green	Link present but not sending or receiving data.
Blinking green	Activity. Port is sending or receiving data.
Alternating	Link fault. Error frames can affect connectivity, and errors such as excessive
green-amber	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 remain amber for up to 30 seconds
	as STP checks the switch for possible loops.

Dual-Purpose Port LEDs

The dual-purpose port LEDs on the switch show the connection of either a copper-based connector or an SFP module. See Figure 1-8. The ports can autonegotiate, or you can manually configure each dual-purpose port as either an 10/100/1000 with copper connectors or as an SFP-module port, but not both types at the same time.

	Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide
OL-16447-01		1-11