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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.
Table 1-6 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 Figure 1-15 to Figure 1-18 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.
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