Installation guide

Chapter 1 Overview
Front-Panel Description
1-10
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-01
When you change the port mode, the meaning of the port LED colors changes.
Table 1-6 explains how to interpret the port LED 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 or an
address violation, or it was blocked by 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
If all LEDs are green (no amber showing), the switch is using
50% or more of the total bandwidth. If the right-most LED is
off, the switch is using more than 25% but less than 50% of the
total bandwidth, and so on. If only the left-most LED is green,
the switch is using less than 0.0488% of the total bandwidth.
See Figure 1-8 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.