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Chapter 3      Switch Installation (8- and 12-Port Switches)
Installing the Switch
Magnet Mounting
WarningRead the wall-mounting instructions carefully before beginning installation. Failure to use the 
correct hardware or to follow the correct procedures could result in a hazardous situation to people 
and damage to the system. Statement 378
CautionDo not wall-mount the switch with its front panel facing up or sideways. According to safety regulations, 
magnet-mount the switch with its front panel facing down to improve airflow and to provide easier 
access to the cables.
Step 1Place one side of the magnet against the bottom of the switch, as shown in Figure 3-7.
Figure 3-7 Mounting the Switch with a Magnet
Step 2
Mount the magnet and switch on a vertical metal surface.
After the switch is attached to the mounting magnet:
1.(Optional) Secure the AC power cord. See “Securing the AC Power Cord” section on page 3-19.
2.Power on the switch. See the “Verifying Switch Operation” section on page 3-7. 1
Metal mounting surface3Switch front panel
2Mounting magnet
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Chapter 3      Switch Installation (8- and 12-Port Switches)
Installing the Switch
3.Connect to a 10/100 or 10/100/1000 port, and run Express Setup. See the Catalyst 3560 Switch 
Getting Started Guide for instructions. To use the CLI setup program, see Appendix D, 
“Configuring the Switch with the CLI-Based Setup Program.”
4.Connect to the front-panel ports. 
Rack-Mounting
Installing the Catalyst 3560-8PC switch or the Catalyst 3560 12-PC-S switch in a 19-inch rack requires 
a bracket kit that is not included with the switch (RCKMNT-19-CMPCT=).
Attaching Brackets to the Switch, page 3-16
Mounting the Switch in a 19-Inch Rack, page 3-17
Attaching Brackets to the Switch
Figure 3-8 shows how to attach a 19-inch bracket to one side of the switch. Follow the same steps to 
attach the second bracket to the opposite side.
Figure 3-8 Attaching the 19-inch Brackets for Rack-Mounting
WarningTo prevent bodily injury when mounting or servicing this unit in a rack, you must take special 
precautions to ensure that the system remains stable. The following guidelines are provided to 
ensure your safety:
   This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
   When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the heaviest 
component at the bottom of the rack.
   If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in 
the rack. 
Statement 1006
1Phillips flat-head screws
1
CONSOLE1x2x3x4x5x6x7x8xCatalyst 3560 SERIES PoE-8
PoESPDDPLXS TATSYST
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Chapter 3      Switch Installation (8- and 12-Port Switches)
Installing the Switch
Mounting the Switch in a 19-Inch Rack
After the brackets are attached to the switch, insert the switch into the 19-inch rack, and align the bracket 
in the rack. Use either the 10-32 pan-head screws or the 12-24 pan-slotted screws to secure the switch 
in the rack, as shown in Figure 3-9.
NoteWe strongly recommend that you allow at least 1.75 inches (4 cm) of clearance above each switch in the 
rack.
Figure 3-9 Mounting the Switch in a 19-Inch Rack
After the switch is mounted in the rack:
1.(Optional) Secure the AC power cord. See “Securing the AC Power Cord” section on page 3-19.
2.Power on the switch. See the “Verifying Switch Operation” section on page 3-7.
3.Connect to a 10/100 or 10/100/1000 port, and run Express Setup. See the Catalyst 3560 Switch 
Getting Started Guide for instructions. To use the CLI setup program, see Appendix D, 
“Configuring the Switch with the CLI-Based Setup Program.”
4.Connect to the front-panel ports. 
Wall-Mounting (with Rack-Mount Brackets)
Installing the Catalyst 3560-8PC switch or the Catalyst 3560 12-PC-S switch in a 19-inch rack requires 
a bracket kit that is not included with the switch (RCKMNT-19-CMPCT=).
Step 1Attach a 19-inch bracket to one side of the switch. Follow the same steps to attach the second bracket to 
the opposite side, as shown in Figure 3-10.
Step 2Mount the switch with the front panel facing down, as shown in Figure 3-10.
For the best support of the switch and cables, make sure the switch is attached securely to wall studs or 
to a firmly attached plywood mounting backboard. 1Phillips machine screws
2x3x4x5x6x7x8x
1
Catalyst 2960 Series
CONSOLE1xPoESPDDPLXS TATSYST
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Chapter 3      Switch Installation (8- and 12-Port Switches)
Installing the Switch
Do not wall-mount the switch with its front panel facing up or sideways. According to safety regulations, 
wall-mount the switch with its front panel facing down to prevent airflow restriction and to provide 
easier access to the cables.
Figure 3-10 Mounting the Switch on a Wall      
After the switch is mounted on the wall:
1.(Optional) Secure the AC power cord. See “Securing the AC Power Cord” section on page 3-19.
2.Power on the switch. See the “Verifying Switch Operation” section on page 3-7.
3.Connect to a 10/100 or 10/100/1000 port, and run Express Setup. See the Catalyst 3560 Switch 
Getting Started Guide for instructions. To use the CLI setup program, see Appendix D, 
“Configuring the Switch with the CLI-Based Setup Program.”
4.Connect to the front-panel ports.  1Phillips flat-head screws2User-supplied screws
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Chapter 3      Switch Installation (8- and 12-Port Switches)
Installing the Switch
Securing the AC Power Cord 
The AC power-cord retainer is an optional part (PWR-CLIP-CMP). 
Step 1Insert the power-cord retainer wire into the slot on the plastic holder.
Step 2Attach the plastic holder onto the switch rear panel with the supplied screw (see Figure 3-11).
Figure 3-11 Insert the Power-Cord Retainer 
Step 3
Rotate the wire to the right side of the AC power cord connector, and insert the AC power cord (see 
Figure 3-12).
Figure 3-12 Insert the AC Power Cord
Step 4
Place the power cord bushing on the power cord with the opening at the top. The retainer wire only fits 
into one slot on the bushing. Move the retainer wire into the bushing slot (see Figure 3-13).
Figure 3-13 Attach the Power-Cord Bushing
Step 5
Slide the bushing so that it rests against the power-cord connector, and then rotate the bushing clockwise 
until the bushing is securely fastened and its opening is on the right side of the power cord (see 
Figure 3-14).
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Chapter 3      Switch Installation (8- and 12-Port Switches)
Where to Go Next
Figure 3-14 Rotate the Bushing Clockwise
Step 6
Insert the securing clip in the opening of the bushing (see Figure 3-15).
Figure 3-15 Insert the Securing Clip
After the power cord is correctly secured, it looks like this:
Where to Go Next
If the default configuration is satisfactory, the switch does not need further configuration. You can use 
any of these management options to change the default configuration:
Start the device manager, which is in the switch memory, to manage individual switches. The device 
manager is a web interface that offers quick configuration and monitoring. You can access the 
device manager from anywhere in your network through a web browser. For more information, see 
the device manager online help. 
Start the Network Assistant application, which is described in the Getting Started with Cisco 
Network Assistant guide. Through this GUI, you can configure and monitor a switch cluster or an 
individual switch. 
Use the CLI from the console to configure the switch as a member of a cluster or as an individual 
switch. See the Catalyst 3560 Switch Software Configuration Guide and the Catalyst 3560 Switch 
Command Reference on Cisco.com for information on using the CLI with a Catalyst 3560 switch.
Start an SNMP application such as the CiscoView application.
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4
Troubleshooting
The LEDs on the front panel provide troubleshooting information about the switch. They show failures 
in the power-on self-test (POST), port-connectivity problems, and overall switch performance. For a full 
description of the switch LEDs, see the “LEDs” section on page 1-11.
You can also get statistics from the browser interface, from the command-line interface (CLI), or from 
a Simple Network Management Protocol (SNMP) workstation. See the software configuration guide, the 
switch command reference guide on Cisco.com, or the documentation that came with your SNMP 
application for details.
This chapter describes these topics for troubleshooting problems:
Diagnosing Problems, page 4-1
Clearing the Switch IP Address and Configuration, page 4-5
Locating the Switch Serial Number, page 4-6
Diagnosing Problems
The LEDs on the front panel provide troubleshooting information about the switch. They show POST 
failures, port-connectivity problems, and overall switch performance. You can also get statistics from 
the CLI or from an SNMP workstation. See the software configuration guide and the switch command 
reference on Cisco.com or the documentation that came with your SNMP application for more 
information.
Evaluate Switch POST Results, page 4-2
Monitor Switch LEDs, page 4-2
Verify Switch Connections, page 4-2
Monitor Switch Performance, page 4-4 
						

							 
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Chapter 4      Troubleshooting
Diagnosing Problems
Evaluate Switch POST Results
As the switch powers on, it begins the POST, a series of tests that runs automatically to ensure that the 
switch functions properly. It might take several minutes for the switch to complete POST.
When the switch begins POST, the system LED slowly blinks green. When POST completes, the system 
LED blinks amber. If POST fails, the system LED remains amber. If POST completes successfully, the 
system LED rapidly blinks green.
NotePOST failures are usually fatal. Contact your Cisco technical support representative if your switch does 
not pass POST.
Monitor Switch LEDs
Look at the port LEDs for troubleshooting information about the switch. See the “LEDs” section on 
page 1-11 for descriptions of the LED colors and their meanings.
Verify Switch Connections
Review these sections when troubleshooting switch connectivity problems:
Bad or Damaged Cable, page 4-2
Ethernet and Fiber Cables, page 4-3
Link Status, page 4-3
Transceiver Module Port Issues, page 4-3
Port and Interface Settings, page 4-4
Ping the End Device, page 4-4
Spanning Tree Loops, page 4-4
Bad or Damaged Cable
Always look at the cable for marginal damage or failure. A cable might connect at the physical layer but 
then cause packet corruption because of subtle damage to its wiring or connectors. You can identify this 
situation because the port will have many packet errors, or the port constantly loses and regains link. In 
these situations:
Change the copper or fiber-optic cable with a known, good cable if necessary.
Look for broken or missing pins on cable connectors.
Rule out any insufficient patch panel connections or media convertors between the source and the 
destination. If possible, bypass the patch panel or eliminate faulty media convertors, such as 
fiber-optic-to-copper convertors.
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Chapter 4      Troubleshooting
Diagnosing Problems
Ethernet and Fiber Cables
Make sure that you have the correct cable type for the connection:
For Ethernet, use Category 3 copper cable for 10 Mb/s unshielded twisted pair (UTP) connections. 
Use either Category 5, Category 5e, or Category 6 UTP for 10/100 or 10/100/1000 Mb/s 
connections.
For fiber-optic connectors, verify that you have the correct cable for the distance and port type. 
Make  sure that the ports on the connected device match and that they use the same type of encoding, 
optical frequency, and fiber type. For more information about cabling, see Appendix B, “Connector 
and Cable Specifications.” 
For copper connections, determine if a crossover cable was used when a straight-through cable was 
required or the reverse. Enable auto-MDIX on the switch, or replace the cable. 
Link Status
Verify that both sides have link. A single broken wire or one shutdown port can cause one side to show 
link, but the other side does not have link.
A link LED does not guarantee that the cable is fully functional. The cable might have encountered 
physical stress that causes it to function at a marginal level. If the link light for the port does not come on:
Connect the cable from the switch to a known, good device.
Make sure that both ends of the cable are connected to the correct ports.
Verify that both devices have power.
Verify that you are using the correct cable type. See Appendix B, “Connector and Cable 
Specifications.” for more information.
Look for loose connections. Sometimes a cable appears to be seated, but is not. Disconnect and then 
reconnect the cable.
Transceiver Module Port Issues
Use only Cisco small form-factor (SFP) modules on the switch. Each Cisco module has an internal serial 
EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify 
and validate that the module meets the requirements for the switch. Look for these items:
Bad or incorrect SFP module. Exchange the suspect module with a known, good module. Verify that 
this module supports this platform. See the “Features” section on page 1-1 for a list of supported 
SFP modules. 
Use the show interfaces privileged EXEC command to verify the port or module error-disabled, 
disabled, or shutdown status. Re-enable the port if necessary.
Make sure that all you have properly cleaned and securely connected all fiber-optic connections. 
						

							 
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Chapter 4      Troubleshooting
Diagnosing Problems
Port and Interface Settings
An obvious but sometimes overlooked cause of port connectivity failure is a disabled port. Verify that 
the port or interface is not disabled or for some reason powered off. If a port or interface is manually 
shut down on one or the other side of the link, the link does not come up until you re-enable the port. 
Use the show interfaces privileged EXEC command to verify the port or interface error-disabled, 
disabled, or shutdown status on both sides of the connection. If necessary, re-enable the port or the 
interface.
Ping the End Device
Verify the end device connection by first pinging it from the directly connected switch, and then work 
your way back port by port, interface by interface, trunk by trunk, until you find the source of the 
connectivity issue. Make sure that each switch can identify the end device MAC address in its 
Content-Addressable Memory (CAM) table.
Spanning Tree Loops
Spanning Tree Protocol (STP) loops can cause serious performance issues that might appear to be port 
or interface problems. In this situation, the switch bandwidth is used repeatedly by the same frames, 
crowding out legitimate traffic.
A unidirectional link can cause loops. This occurs when the traffic that the switch sends is received by 
its neighbor, but the switch does not receive the traffic that is sent from the neighbor. A broken 
fiber-optic cable, other cabling, or a port issue could cause this one-way communication.
You can enable the UniDirectional Link Detection (UDLD) protocol on the switch to help identify 
difficult-to-find unidirectional link problems. UDLD supports a normal mode of operation (the default) 
and an aggressive mode. In normal mode, UDLD detects unidirectional links because of incorrectly 
connected interfaces on fiber-optic connections. In aggressive mode, UDLD also detects unidirectional 
links caused by one-way traffic on fiber-optic and twisted-pair links and by incorrectly connected 
interfaces on fiber-optic links. For information about enabling UDLD on the switch, see the 
“Understanding UDLD” section in the software configuration guide.
Monitor Switch Performance
Review these sections when you troubleshoot switch performance problems:
Speed, Duplex, and Autonegotiation, page 4-4
Autonegotiation and Network Interface Cards, page 4-5
Cabling Distance, page 4-5
Speed, Duplex, and Autonegotiation
If the port statistics show a large number of alignment errors, frame check sequence (FCS), or 
late-collisions errors, a speed or duplex mismatch might be the problem.
A common issue with speed and duplex occurs when the duplex settings are mismatched between two 
switches, between a switch and a router, or between the switch and a workstation or server. This can 
happen when you manually set the speed and duplex or because of autonegotiation issues between the 
two devices.