Switch Installation - it

Switch Installation - it

C H A P T E R

2

Switch Installation

This chapter describes how to install and connect a Catalyst 3650 switch. It also includes planning and cabling considerations for stacking switches. Read the topics and perform the procedures in this order:

Preparing for Installation, page 2-1

Planning a Switch Data Stack, page 2-4

Installing the Switch, page 2-9

Connecting to the StackWise Ports, page 2-15

Connecting Devices to the Ethernet Ports, page 2-19

Where to Go Next, page 2-22

For initial switch setup, how to assign the switch IP address, and for powering information, see the switch getting started guide on Cisco.com.

Preparing for Installation

Safety Warnings, page 2-1

Installation Guidelines, page 2-3

Tools and Equipment, page 2-4

Safety Warnings

This section includes the basic installation caution and warning statements. Translations of the warning statements appear in the Regulatory Compliance and Safety Information for the Catalyst 3650 Switch document available at Cisco.com. Read this section before you start the installation procedure.

Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can

cause serious burns or weld the metal object to the terminals. Statement 43

Warning

Do not stack the chassis on any other equipment. If the chassis falls, it can cause severe bodily injury

and equipment damage. Statement 48

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Chapter 2 Switch Installation

Preparing for Installation

Warning

Ethernet cables must be shielded when used in a central office environment. Statement 171

Warning

Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be

aware of the emergency number in your country. Statement 361

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.

Statement 1001

Warning

Read the installation instructions before connecting the system to the power source. Statement 1004

Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security.

Statement 1017

Warning The plug-socket combination must be accessible at all times, because it serves as the main

disconnecting device. Statement 1019

Warning

Use copper conductors only. Statement 1025

Warning This unit might have more than one power supply connection. All connections must be removed to

de-energize the unit. Statement 1028

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.

Statement 1030

Warning Ultimate disposal of this product should be handled according to all national laws and regulations.

Statement 1040

Warning For connections outside the building where the equipment is installed, the following ports must be connected through an approved network termination unit with integral circuit protection: 10/100/1000

Ethernet. Statement 1044

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Chapter 2 Switch Installation

Preparing for Installation

Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of:

113°F (45°C) Statement 1047

Warning

No user-serviceable parts inside. Do not open. Statement 1073

Warning

Installation of the equipment must comply with local and national electrical codes. Statement 1074

Warning

To prevent airflow restriction, allow clearance around the ventilation openings to be at least:

3 in. (7.6 cm) Statement 1076

Note

The grounding architecture of this product is DC-isolated (DC-I).

Installation Guidelines

Before installing the switch, verify that these guidelines are met:

For the clearance to the front and rear panels, make sure that

Front-panel indicators can be easily read.

Clearance is at least 4.4 in. (11.1 cm) from switch rear panel.

Access to ports is sufficient for unrestricted cabling.

AC power cord can reach from the AC power outlet to the connector on the switch rear panel.

The SFP or SFP+ module minimum bend radius and connector length is met. See the SFP or

SFP+ module documentation for more information.

For switches with the optional 1025-W power-supply module (PWR-C2-1025WAC=), first rack-mount the switch before installing the power-supply module.

Make sure power-supply modules and fan modules are securely inserted in the chassis before moving the switch.

When connecting or disconnecting the power cord on a switch that is installed above or below a

1025-W power supply-equipped switch, you might need to remove the module from the switch to access the power cord.

Cabling is away from sources of electrical noise, such as radios, power lines, and fluorescent lighting fixtures. Make sure that the cabling is safely away from other devices that might damage the cables.

For copper connections on Ethernet ports, cable lengths from the switch to connected devices can be up to 328 feet (100 meters).

For cable requirements for SFP+ module connections, see the “Cable and Adapter Specifications” section on page B-5 . Each port must match the wave-length specifications on the other end of the cable, and the cable must not exceed the maximum cable length.

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Chapter 2 Switch Installation

Planning a Switch Data Stack

Operating environment is within the ranges listed in Appendix A, “Technical Specifications.”

Airflow around the switch and through the vents is unrestricted.

Temperature around the unit does not exceed 113°F (45°C). If the switch is installed in a closed or multirack assembly, the temperature around it might be greater than normal room temperature.

Cisco Ethernet switches are equipped with cooling mechanisms, such as fans and blowers. However, these fans and blowers can draw dust and other particles, causing contaminant buildup inside the chassis, which can result in system malfunction. You must install this equipment in an environment as free from dust and foreign conductive material (such as metal flakes from construction activities) as is possible.

Tools and Equipment

Obtain these necessary tools and equipment:

A number-2 Phillips screwdriver to rack-mount the switch.

A Torx T15 screwdriver, or the Torx T15 key that ships with StackWise upgrade kits, to install the

StackWise adapter.

Verifying Switch Operation

Before you install the switch in a rack, or on a table or shelf, you should power on the switch and verify that the switch passes POST. See the “Running Express Setup” section in the getting started guide for the steps required to connect a PC to the switch and to run Express Setup.

Powering Off the Switch

After a successful POST, disconnect the power cord from the switch. Install the switch in a rack, on a table, or on a shelf as described in the

Chapter 2, “Installing the Switch,”

section.

Planning a Switch Data Stack

Catalyst 3650 switches can share bandwidth by using data stacking.

Switch Stacking Guidelines, page 2-5

Data Stack Cabling Configurations, page 2-5

Data Stack Bandwidth and Partitioning Examples, page 2-6

Power-On Sequence for Switch Data Stacks, page 2-7

Changes to Switch Stack Membership, page 2-8

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Chapter 2 Switch Installation

Planning a Switch Data Stack

Switch Stacking Guidelines

For general concepts and management procedures for switch stacks, see the switch software configuration guide on Cisco.com.

A StackWise adapter must be installed in the stacking port to enable stacking. The StackWise cable connects to the StackWise adapter in the stacking port. For switches ordered with stacking, the

StackWise adapters are pre-installed. If the switch is not ordered with stacking, the adapters must be ordered separately and installed.

Before connecting the switches in a stack, observe these stacking guidelines:

Size of the switch and any optional power-supply module. The 1025-W power-supply module is longer than the other modules. Stacking switches with the same power-supply modules together makes it easier to cable the switches. For switch dimensions, see Appendix A, “Technical

Specifications.”

Length of StackWise cable. Depending on the configurations that you have, you might need different-sized StackWise cables. If you do not specify the length of the StackWise cable, the

0.5-meter cable is supplied. If you need the 1-meter cable or the 3-meter cable, you can order it from your Cisco supplier. For cable part numbers, see the “StackWise Cables” section on page B-5 . The

“Data Stack Cabling Configurations” section on page 2-5 provides examples of recommended

configurations.

Minimum bend radius and coiled diameter for StackWise cables. Cisco recommends a minimum bend radius and coiled diameter for each StackWise cable. For more information, see Table B-1 in the “StackWise Cables Minimum Bend Radius and Coiled Diameter” section on page B-6 .

Data stacks can be created with up to nine switches in a stack.

Note

You cannot have a switch stack containing a mix of Catalyst 3650 and Catalyst 3850 switches.

Data Stack Cabling Configurations

Figure 2-1 is an example of a recommended configuration that uses the supplied 0.5-meter StackWise

cable. In this example, the switches are stacked in a vertical rack or on a table. This configuration provides redundant connections.

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Chapter 2 Switch Installation

Planning a Switch Data Stack

The configuration example (

Figure 2-1 ) uses the supplied 0.5-meter StackWise cable. The example

shows the full-ring configuration that provides redundant connections.

Figure 2-1 Data Stacking the Catalyst 3650 Switches in a Rack or on a Table Using the 0.5-meter

StackWise Cables

PWR-C2-250WAC PWR-C2-640WAC

CONSOLE MGMT

PWR-C2-250WAC PWR-C2-640WAC

CONSOLE MGMT

PWR-C2-250WAC

PWR-C2-640WAC

CONSOLE MGMT

PWR-C2-250WAC PWR-C2-640WAC

CONSOLE MGMT

Figure 2-2

shows a recommended configuration when the switches are mounted side-by-side. Use the

1-meter and the 3-meter StackWise cables to connect the switches. This configuration provides redundant connections.

Figure 2-2 Data Stacking up to Four Switches in a Side-by-Side Mounting

Data Stack Bandwidth and Partitioning Examples

This section provides examples of data stack bandwidth and possible data stack partitioning.

Figure 2-3

shows a data stack of Catalyst 3650 switches that provides full bandwidth and redundant

StackWise cable connections.

Figure 2-3

1

3

Example of a Data Stack with Full Bandwidth Connections

PWR-C2-250WAC PWR-C2-640WAC

PWR-C2-250WAC PWR-C2-640WAC

2

PWR-C2-250WAC PWR-C2-640WAC

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Chapter 2 Switch Installation

Planning a Switch Data Stack

Figure 2-4 shows an example of a stack of Catalyst 3650 switches with incomplete StackWise cabling

connections. This stack provides only half bandwidth and does not have redundant connections.

Figure 2-4

1

2

Example of a Data Stack with Half Bandwidth Connections

PWR-C2-250WAC PWR-C2-640WAC

PWR-C2-250WAC

PWR-C2-250WAC

PWR-C2-640WAC

PWR-C2-640WAC

Figure 2-5 and Figure 2-6

show data stacks of Catalyst 3650 switches with failover conditions. In

Figure 2-5 , the StackWise cable is bad in link 2. Therefore, this stack provides only half bandwidth and

does not have redundant connections. In

Figure 2-6 , link 2 is bad. Therefore, this stack partitions into

two stacks, and the top and bottom switches become the active switch in the stack. If the bottom switch is a member (not active or standby switch), it reloads.

Figure 2-5

1

Example of a Data Stack with a Failover Condition

PWR-C2-250WAC PWR-C2-640WAC

2

PWR-C2-250WAC

PWR-C2-250WAC

PWR-C2-640WAC

PWR-C2-640WAC

3

Figure 2-6

1

Example of a Partitioned Data Stack with a Failover Condition

PWR-C2-250WAC PWR-C2-640WAC

PWR-C2-250WAC PWR-C2-640WAC

PWR-C2-250WAC PWR-C2-640WAC

2

Power-On Sequence for Switch Data Stacks

Consider these guidelines before you power on the switches in a stack:

The sequence in which the switches are first powered on might affect the switch that becomes the active switch and the standby switch.

There are two ways to elect an active switch:

If you want a particular switch to become the active switch, configure it with the highest priority. Among switches with same priority, the switch with the lowest MAC address becomes the active switch.

If you want a particular switch to become the active switch, power on that switch first. This switch remains the active switch until a reelection is required. After 2 minutes, power on the other switches in the stack. If you have no preference as to which switch becomes the active switch, power on all the switches in the stack within 1 minute. These switches participate in the active switch election. Switches powered on after 2 minutes do not participate in the election.

If changes are made to the stack without powering down the switches, the following results can occur:

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Chapter 2 Switch Installation

Planning a Switch Data Stack

If two operating partial ring stacks are connected together using a stack cable, a stack merge can occur. This situation reloads the whole stack (all switches in the stack).

If some switches in the stack are completely separated from the stack, a stack split can occur.

A stack split can occur on a full ring stack if:

More than one running switch is removed without powering down.

More than one stack cable is removed without powering down.

A stack split can occur in a partial ring stack if:

A switch is removed without powering down.

A stack cable is removed without powering down.

In a split stack, depending on where the active and standby switches are located, either two stacks might be formed (with the standby taking over as the new active switch in the newly formed stack) or all the members in the newly formed stack might reload.

Note

These results depend on how the switches are connected. You can remove two or more switches from the stack without splitting the stack.

For conditions that can cause a stack reelection or to manually elect the active switch, see the stacking software configuration guide on Cisco.com at this URL: http://www.cisco.com/go/cat3650_docs

Changes to Switch Stack Membership

If you replace a stack member with an identical model, the new switch functions with exactly the same configuration as the replaced switch, assuming that the new switch (referred to as the provisioned switch) is using the same member number as the replaced switch.

The operation of the switch stack continues uninterrupted during membership changes unless you remove the active switch or you add powered-on standalone switches or switch stacks.

Note

A switch stack always has one active switch and one standby switch. The active switch contains the saved and running configuration files for the switch stack. If the active switch becomes unavailable, the standby switch assumes the role of the active switch, and continues to the keep the stack operational.

For powered-on switches:

Adding powered-on switches (merging) causes all switches to reload and elect a new active switch from among themselves. The newly elected active switch retains its role and configuration. All other switches change their stack member numbers to the lowest available numbers and use the stack configuration of the newly elected active switch.

Removing powered-on stack members causes the switch stack to divide (partition) into two or more switch stacks, each with the same configuration. This can cause an IP address configuration conflict in your network. If you want the switch stacks to remain separate, change the IP address or addresses of the newly created switch stacks.

If a newly created switch stack does not have an active switch or standby switch, the switch stack will reload and elect a new active switch.

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Chapter 2 Switch Installation

Installing the Switch

Note

Make sure that you power off the switches that you add to or remove from the switch stack.

After adding or removing stack members, make sure that the switch stack is operating at full bandwidth.

Press the Mode button on a stack member until the Stack mode LED is on. The last two right port LEDs on all switches in the stack should be green. Depending on the switch model, the last two right ports are

10-Gigabit Ethernet ports or small form-factor pluggable (SFP) module ports (10/100/1000 ports). If one or both of these LEDs are not green on any of the switches, the stack is not operating at full bandwidth.

If you remove powered-on members but do not want to partition the stack:

Power off the switches in the newly created switch stacks.

Reconnect them to the original switch stack through their stack ports.

Power on the switches.

Installing the Switch

Rack-Mounting, page 2-10

Table- or Shelf-Mounting, page 2-14

After Installing the Switch, page 2-14

The illustrations shown in this section show the Catalyst 3650-48 PoE+ switch as an example. You can install other Catalyst 3650 switches following the same procedures.

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Chapter 2 Switch Installation

Installing the Switch

Rack-Mounting

To install the switch in a 19-inch rack, follow the instructions described in this section.

Warning

To 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

The 19-inch brackets are included with the switch. Installing the switch in other rack types requires an optional bracket kit not included with the switch.

Figure 2-7

shows the mounting brackets and part numbers.

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Chapter 2 Switch Installation

Figure 2-7 Rack-Mounting Brackets

2

1

Installing the Switch

3 4 5

1

19-inch brackets (RACK-KIT-T1=)

2

Extension rails and brackets for four-point mounting, includes 19-inch brackets.

(4PT-KIT-T1=)

3

ETSI brackets (RACK-KIT-T1=)

4

23-inch brackets (RACK-KIT-T1=)

5

24-inch brackets (RACK-KIT-T1=)

Attaching the Rack-Mount Brackets

To install the switch in a rack, use four Phillips flat-head screws to attach the long side of the brackets to the switch for the front- or rear-mounting positions (

Figure 2-8 ). Use four screws to attach the

brackets for the front-mounting position.

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Installing the Switch

Figure 2-8 Attaching Brackets for 19-inch Racks

WR-C2-640W

AC

1

2

Ca taly st 3

8 Po

E+ 4

X10

G

3

2

2

Ca talys t 3

8 Po

E+ 4

X10

G

3

2

1

Rear-mounting position

2

Number-8 Phillips flat-head screws

3

Front-mounting position

2

2

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Chapter 2 Switch Installation

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Chapter 2 Switch Installation

Installing the Switch

Mounting the Switch in a Rack

After the brackets are attached to the switch, use the supplied Phillips machine screws to attach the brackets to the rack (

Figure 2-10

). Use the black Phillips machine screw to attach the cable guide to the left or right bracket.

When you complete the switch installation, see the

“After Installing the Switch” section on page 2-14

for more information switch configuration.

Figure 2-9 Mounting the Switch in a Rack

1

2

3

1X

ACTV

12X

13X

4

36X

37X

48X

Cata lyst 365

0 48P oE

+ 2X

10G

1

2

Phillips machine screw, black

Cable guide

3

Front-mounting position

4

Number-12 or number-10 Phillips machine screws

When you complete the switch installation, see the

“After Installing the Switch” section on page 2-14

for more information about switch configuration.

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Chapter 2 Switch Installation

Installing the Switch

Table- or Shelf-Mounting

To install the switch on a table or shelf, locate the adhesive strip with the rubber feet in the mounting-kit envelope. Attach the four rubber feet to the recessed areas on the bottom of the chassis (see

Figure 2-10 ).

Figure 2-10 Attaching the Adhesive Pads for Table- or Shelf-Mounting

PWR-C2-640WAC

PWR-C2-640WAC

CONSOLE

MGMT

1

1

1

Adhesive pads

When you complete the switch installation, see the “After Installing the Switch” section on page 2-14

for more information about the switch configuration.

After Installing the Switch

After the switch is installed, you might need to:

Configure the switch by running Express Setup to enter the initial switch configuration. For instructions, see the switch getting started guide that shipped with the switch and also on Cisco.com.

Use the CLI setup program to enter the initial switch configuration. See Appendix C, “Configuring the Switch with the CLI-Based Setup Program.”

Connect to the front-panel ports. See the

“Connecting Devices to the Ethernet Ports” section on page 2-19 .

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Chapter 2 Switch Installation

Connecting to the StackWise Ports

Connecting to the StackWise Ports

Before connecting the StackWise cables, review the

“Planning a Switch Data Stack” section on page 2-4

.

Always use a Cisco-approved StackWise cable to connect the switches.

Caution

Removing and installing the StackWise cable can shorten its useful life. Do not remove and install the cable more often than is absolutely necessary (removing and installing it up to 200 times is supported).

Step 1

Step 2

Step 3

Remove the dust covers from the StackWise cables and store them for future use.

A StackWise adapter must be installed in the StackWise port to enable stacking. The default setup is that

StackWise adapter blanks are installed in the StackWise ports. If StackWise stacking is ordered with the switch, StackWise adapters are already installed in the StackWise ports, and you can proceed to step 4.

Remove the StackWise adapter blanks from each destination StackWise port using the Torx T15 Allen key provided in the stacking kit (or a Torx T15 screwdriver), as shown in

Figure 2-11

. Store them for future use.

Install a StackWise adapter in each destination StackWise port, and secure in place using the supplied

Torx T15 key, or a Torx T15 screwdriver, as shown in

Figure 2-12 .

Note

It is not necessary to remove the fan modules prior to removal or installation of the StackWise adapter. If the installation is performed with the system powered-on, the fans must be left in the installed position at all times.

Step 4

Step 5

Connect the StackWise cable to the StackWise port on the switch rear panel:

a.

Align the StackWise cable connector with the StackWise adapter in the StackWise port.

b.

Insert the StackWise cable connector in to the StackWise port as shown in

Figure 2-13 . Make sure

that the Cisco logo is on the top side of the connector.

c.

Finger-tighten the screws (clockwise direction).

Connect the other end of the cable to the port on the other switch and finger-tighten the screws. Avoid overtightening the screws.

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Chapter 2 Switch Installation

Connecting to the StackWise Ports

Figure 2-11 Removing the StackWise Adapter Blank from a StackWise Port

5

CONSOLE

MGMT

2

4

1

3

1

Torx T15 screwdriver

2

Assembly screw

3

Cisco logo

Figure 2-12

4

5

6

StackWise adapter blank

StackWise port

Installing the StackWise Adapter in a StackWise Port

5

CONSOLE

MGMT

3

4

1

1

Torx T15 screwdriver

2

Assembly screw

3

Cisco logo

2

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5

StackWise adapter

StackWise port

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Chapter 2 Switch Installation

Installing and Removing SFP and SFP+ Modules

Figure 2-13 Connecting the StackWise Cable to the StackWise Adapter

3

CONSOLE

MGMT

1 2

1

StackWise cable

2

Cisco logo

3

StackWise adapter installed in a StackWise port

When you need to remove the StackWise cable from the connector, make sure to fully unscrew the correct screws. When the connectors are not being used, replace the dust covers.

Note

If the StackWise cable is difficult to remove, you can use a flat-blade screwdriver to assist with removing the cable screws. The screwdriver only works for cable removal and is designed to slip off if used for cable installation.

Installing and Removing SFP and SFP+ Modules

See these sections for information on SFPs and SFP+:

Installing SFP and SFP+ Modules, page 2-17

Removing SFP or SFP+ Modules, page 2-19

Installing SFP and SFP+ Modules

See the “SFP and SFP+ Modules” section on page 1-8 , and the switch release notes on Cisco.com for the list of supported SFP and SFP+ modules. Use only supported SFP modules on the switch.

For cable specifications, see Appendix B, “Connector and Cable Specifications.”

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Chapter 2 Switch Installation

Installing and Removing SFP and SFP+ Modules

Warning

Class 1 laser product. Statement 1008

Do not remove the dust plugs from the SFP modules or the rubber caps from the fiber-optic cable until you are ready to connect the cable. The plugs and caps protect the module ports and cables from contamination and ambient light.

Removing and installing an SFP module can shorten its useful life. Do not remove and insert any

SFP module more often than is necessary.

To prevent ESD damage, follow your normal board and component handling procedures when connecting cables to the switch and other devices.

Observe these precautions:

Step 1

Step 2

Step 3

Step 4

Attach an ESD-preventive wrist strap to your wrist and to an earth ground surface.

Find the send (TX) and receive (RX) markings that identify the top of the SFP module.

On some SFP modules, the send and receive (TX and RX) markings might be shown by arrows that show the direction of the connection.

If the SFP module has a bale-clasp latch, move it to the open, unlocked position.

Align the module in front of the slot opening, and push until you feel the connector snap into place.

Figure 2-14 Installing an SFP Module in an Uplink Port

Catalyst 3650 48PoE+ 2X10G

48X G1

G2

G3

TE3

G4

TE4

Step 5

Step 6

Step 7

If the module has a bale-clasp latch, close it to lock the SFP module in place.

Remove the SFP dust plugs and save.

Connect the SFP cables.

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Chapter 2 Switch Installation

Connecting Devices to the Ethernet Ports

Figure 2-15 Connecting an SFP Cable to an SFP Module Installed in an Uplink Port

48X

Catalyst 3650 48 PoE+ 2X10G

G3

TE3

G4

TE4

Removing SFP or SFP+ Modules

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Attach an ESD-preventive wrist strap to your wrist and to an earth ground surface.

Disconnect the cable from the SFP module. For reattachment, note which cable connector plug is send

(TX) and which is receive (RX).

Insert a dust plug into the optical ports of the SFP module to keep the optical interfaces clean.

If the module has a bale-clasp latch, pull the bale out and down to eject the module. If you cannot use your finger to open the latch, use a small, flat-blade screwdriver or other long, narrow instrument to open it.

Grasp the SFP module, and carefully remove it from the slot.

Place the SFP module in an antistatic bag or other protective environment.

Connecting Devices to the Ethernet Ports

10/100/1000 Ethernet Port Connections, page 2-19

PoE+ Port Connections, page 2-21

Caution

Category 5e and Category 6 cables can store high levels of static electricity. Always ground the cables to a suitable and safe earth ground before connecting them to the switch or other devices.

10/100/1000 Ethernet Port Connections

The 10/100/1000 Ethernet ports use RJ-45 connectors with Ethernet pinouts. The maximum cable length is 328 feet (100 meters). The 100BASE-TX and 1000BASE-T traffic requires Category 5, Category 5e, or Category 6 UTP cable. The 10BASE-T traffic can use Category 3 or Category 4 cable.

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Chapter 2 Switch Installation

Connecting Devices to the Ethernet Ports

The autonegotiation feature is enabled by default on the switch. At this setting, the switch ports configure themselves to operate at the speed of attached device. If the attached device does not support autonegotiation, you can explicitly set the switch port speed and duplex parameters. To maximize performance, either let the ports autonegotiate both speed and duplex, or set the port speed and duplex parameters on both ends of the connection.

For simplified cabling, the automatic medium-dependent interface crossover (auto-MDIX) feature is enabled by default on the switch. With auto-MDIX enabled, the switch detects the required cable type for copper Ethernet connections and configures the interface accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a switch 10/100/1000 Ethernet port regardless of the type of device on the other end of the connection.

See the switch software configuration guide or the switch command reference on Cisco.com for more information about enabling or disabling autonegotiation and auto-MDIX.

If auto-MDIX is disabled, use the guidelines in

Table 2-1

to select the correct cable for connecting the switch 10/100/1000 Ethernet ports to other devices. See the “Cable and Adapter Specifications” section on page B-5 for cable-pinout descriptions.

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Chapter 2 Switch Installation

Connecting Devices to the Ethernet Ports

Table 2-1 Recommended Ethernet Cables (When Auto-MDIX is Disabled)

Device

Switch to switch

Crossover Cable

Yes

Switch to hub Yes

Switch to computer or server No

1

Switch to router

Switch to IP phone

No

No

Straight-Through Cable

No

No

Yes

Yes

Yes

1

1.

100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5, Category 5e, or

Category 6 cable. 10BASE-T traffic can use Category 3 or Category 4 cable.

PoE+ Port Connections

The 10/100/1000 PoE+ ports have the same autonegotiation settings and cabling requirements that are

described in the “10/100/1000 Ethernet Port Connections” section on page 2-19

. These ports can provide

PoE or PoE+ inline power.

PoE inline power supports devices compliant with the IEEE 802.3af standard, as well as prestandard

Cisco IP Phones and Cisco Aironet Access Points. Each port can deliver up to 15.4 W of PoE.

PoE+ inline power supports devices compliant with the IEEE 802.3at standard, by delivering up to 30 W of PoE+ power per port to all switch ports.

See Table 1-12 on page 1-18 for the power supply modules required to support PoE and PoE+ on 24- and

48-port switches.

For more information about the required power-supply module and the PoE specifications, see the

“Power Supply Modules” section on page 1-17 and Appendix A, “Technical Specifications.”

Note

Many legacy powered devices, including older Cisco IP phones and access points that do not fully support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.

Caution

PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Use only standard-compliant cabling to connect Cisco prestandard IP Phones, wireless access points, or

IEEE 802.3af-compliant devices to PoE ports. A cable or device that causes a PoE fault must be removed from the network.

Warning Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be

aware of the emergency number in your country. Statement 361

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Chapter 2 Switch Installation

Where to Go Next

Warning Voltages that present a shock hazard may exist on Power over Ethernet (PoE) circuits if interconnections are made using uninsulated exposed metal contacts, conductors, or terminals.

Avoid using such interconnection methods, unless the exposed metal parts are located within a restricted access location and users and service people who are authorized within the restricted access location are made aware of the hazard. A restricted access area can be accessed only through

the use of a special tool, lock and key or other means of security. Statement 1072

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 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 to configure the switch as a member of a cluster or as an individual switch from the console. See the switch command reference on Cisco.com for information on using the CLI with the switch.

Use the Cisco Prime Infrastructure application.

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Catalyst 3650 Switch Hardware Installation Guide

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