Cisco 2975 User Manual
Page 14
1-6
Catalyst 2975 Switch Hardware Installation Guide
OL-17784-01
Chapter 1 Product Overview
Front Panel
If your switches are stacked and you press the Mode button on any switch in the stack, all the switches
change to display the same selected mode. For example, if you press the mode button on the stack master
to display SPEED, all the other stack members display SPEED.
Even if PoE mode is not selected, this LED still shows PoE problems if they are detected.
Stack LED
The stack LED shows the sequence of member switches in a stack. Up to nine switches can be members
of a stack. The first nine port LEDs show the member number of a switch in a stack.
shows
the LEDs on the first switch, which is stack member number 1. For example, if you press the Mode
button and select Stack, the LED for port 1 blinks green. The LEDs for port 2 and 3 are solid green, as
these represent the member numbers of other stack members. The other port LEDs are off because there
are no more members in the stack.
STAT
(port status)
Off
No link, or port was administratively shut down.
Green
Link present.
Blinking green
Activity. Port is sending or receiving data.
Alternating
green-amber
Link fault. Error frames can affect connectivity, and errors such as
excessive collisions, cyclic redundancy check (CRC) errors, and
alignment and jabber errors are monitored for a link-fault
indication.
Amber
Port is blocked by Spanning Tree Protocol (STP) and is not
forwarding data.
After a port is reconfigured, the port LED can remain amber for up
to 30 seconds as STP checks the switch for possible loops.
Blinking amber Port is blocked by STP and is sending and receiving packets.
DUPLX
(duplex)
Off
Port is operating in half duplex.
Green
Port is operating in full duplex.
SPEED
Off
Port is operating at 10 Mb/s.
Green
Port is operating at 100 Mb/s.
Blinking green
Port is operating at 1000 Mb/s.
SFP module ports
Off
Port is operating at 10 Mb/s.
Green
Port is operating at 100 Mb/s.
Blinking green
Port is operating at 1000 Mb/s.
STACK
(stack member)
Off
No stack member has that member number.
Blinking green
Stack member number.
Green
Member numbers of other stack member switches.
Table 1-7
Meanings of LED Colors in Different Modes (continued)
Port Mode
Port LED Color
Meaning