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Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-02
Chapter 1 Overview
Front-Panel Description
When you change the port mode, the meanings of the port LED colors change.
explains how to interpret these colors.
Table 1-6
Meaning of Port LED Colors in Different Modes
Port Mode
Color
Meaning
STAT (port status)
Off
No link.
Solid green
Link present.
Flashing green Activity. Port is transmitting 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.
Solid amber
Port is not forwarding. Port was disabled by management, an
address violation, or Spanning Tree Protocol (STP).
Note
After a port is reconfigured, the port LED can
remain amber for up to 30 seconds while STP
checks the switch for possible loops.
UTIL (utilization)
Green
The current backplane utilization that is displayed over the
amber LED background on a logarithmic scale.
Amber
The maximum backplane utilization since the switch was
powered on.
Green and
amber
See
for details.
Note
If the current utilization exceeds the maximum
utilization, the maximum utilization is
automatically updated.
DUPLX
Off
Port is operating in half duplex.
(half or full duplex) Green
Port is operating in full duplex.