Cisco Catalyst 2975 Hardware Installation Manual page 14

Front Panel
Table 1-7
Port Mode
STAT
(port status)
DUPLX
(duplex)
SPEED
STACK
(stack member)
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.
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.
Catalyst 2975 Switch Hardware Installation Guide
1-6
Meanings of LED Colors in Different Modes (continued)
Port LED Color Meaning
Off No link, or port was administratively shut down.
Green Link present.
Blinking green Activity. Port is sending or receiving data.
Alternating Link fault. Error frames can affect connectivity, and errors such as
green-amber 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.
Off Port is operating in half duplex.
Green Port is operating in full duplex.
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.
Off No stack member has that member number.
Blinking green Stack member number.
Green Member numbers of other stack member switches.
Chapter 1 Product Overview
Figure 1-3 shows
OL-17784-01