Installation guide

1-17
Catalyst 2950 Switch Hardware Installation Guide
OL-6156-01
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 for the non-LRE switches. Table 1-7 explains how to interpret the colors for the
LRE switches. The port LEDs are off when the MODE is set to SPEED.
Table 1-5 Port Mode LEDs
Mode LED Port Mode Description
STAT Port status The port status. This is the default mode.
UTIL
1
1. A Catalyst 2950 LRE switch does not have a UTIL or a DUPLX LED.
Switch utilization The bandwidth in use by the switch.
DUPLX Port duplex mode The port duplex mode: half duplex or full duplex.
SPEED Port speed The port operating speed: 10 or 100 Mbps for 10/100 ports
and 10, 100, or 1000 Mbps for 10/100/1000 ports.
Table 1-6 Meaning of Port LED Colors in Different Modes for Non-LRE Switches
Port Mode Color Meaning
STAT (port status) Off No link.
Solid 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 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 1-20 to Figure 1-24 for details.
Note If the current utilization exceeds the maximum
utilization, the maximum utilization is automatically
updated.
DUPLX
(half or full duplex)
Off Port is operating in half duplex.
Green Port is operating in full duplex.