1-11
Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide
OL-16447-01
Chapter 1 Product Overview
Front Panel
Alarm LEDs
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.
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.
Table 1-8
Alarm LEDs
Color
System Status
Off
No alarm
Amber
Minor alarm
Red
Major alarm
Blinking red
Critical alarm
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
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 remain amber for up to 30 seconds
as STP checks the switch for possible loops.
