Cisco 3750 - Manual (Page 16)

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Catalyst 3750 Metro Switch Hardware Installation Guide
OL-9160-02
Chapter 1 Product Overview
Front Panel Description
Table 1-4 Meaning of LED Colors in Different Modes on the Switch
Port Mode LED Color Meaning
STAT
(port status) Off No link, or port was administratively shut down.
Green Link present.
Flashing 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
1 errors, and alignment and jabber errors
are monitored for a link-fault indication.
1. CRC = cyclic redundancy check
Amber Port is blocked by Spanning Tree Protocol (STP) and is not
forwarding data.
Note After a port is reconfigured, the port LED can remain
amber for up to 30 seconds as STP checks the switch for
possible loops.
Flashing
amber Port is blocked by STP and is sending or receiving packets.
DUPLX
(duplex) Off Port is operating in half duplex.
Green Port is operating in full duplex.
SPEED 10/100 ports
Off Port is operating at 10 Mb/s.
Green Port is operating at 100 Mb/s.
SFP ports
Off Port is operating at 10 Mb/s.
Green Port is operating at 100 Mb/s.
Flashing green Port is operating at 1000 Mb/s.
Note 1000BASE-T SFP modules can operate at 10, 100, or
1000 Mb/s in full-duplex mode only in standard SFP ports.
STACK
(stack member) Not used.