Cisco SF250-24-K9 Manuale utente

Quick Start Guide

Cisco 250 Series Smart Switches

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2 Cisco 250 Series Smart Switches

Welcome

Thank you for choosing the Cisco 250 Series Smart Switch. These

switches are designed to be operational right out-of-the-box as a standard

switch. In the default configuration, it forwards packets between the

connecting devices after powered up.

Package Contents

•Cisco 250 Series Smart Switch

•Rackmount Kit

•Power Cord or Adapter

•This Quick Start Guide

•Pointer Card with China RoHS

•Technical Support Contacts

•EU Directives 1999/5/EC Compliance Information (for EU SKU only)

This guide familiarizes you with the smart switch layout and describes how

to deploy the switch in your network. For additional information, see

www.cisco.com/go/250switches

Before You Begin

Before you begin the installation, make sure that you have the following:

•RJ-45 Ethernet cables (Category 5e or higher) for connecting network

devices.

•Tools for installing the hardware. The rack-mount kit packed with the

switch contains four rubber feet for desktop placement, and two

brackets and twelve screws for rack-mounting. If the supplied screws

are lost, use replacement screws in the following size:

– Diameter of the screw head: 6.9 mm

– Length of face of screw head to base of screw: 5.9 mm

– Shaft diameter: 3.94 mm

•The wall mount kit includes screws and anchors. If the supplied screws

are lost, use replacement screws in the following size:

– Diameter of the screw head: 6.8 mm

– Length of face of screw head to base of screw: 16 mm

– Shaft diameter: 3.5 x 1.3 mm

Cisco 250 Series Smart Switches 3

•Computer with Internet Explorer (version 9.0, 10.0, 11.0), or Firefox

(version 36.0, 37.0, or higher), or Chrome (version 40,41,42 or higher) for

using the web-based interface.

Mounting the Cisco 250 Series Smart

Switches

There are three ways to install the switch:

•Place the switch on a flat surface. To place the switch on a desktop,

install the four rubber feet (included) on the bottom of the switch.

• Mount the switch in a standard rack (1 rack unit high).

•Mount on a wall.

Placement Tips

Do not mount the device in a location where any of the following conditions

exist:

• High Ambient Temperature—To prevent the switch from overheating,

do not operate it in an area that exceeds an ambient temperature of

122°F (50°C).

•AirFlow—Both side panels must be unobstructed to prevent

overheating.

•Overloading—The device must be level, stable, and secure to prevent

it from sliding or shifting out-of-position.

• Circuit Overloading—Adding the device to the power outlet must not

overload that circuit.

Rack Mounting

You can mount the switches in any standard size, 19-inch (about 48 cm)

wide rack. The switch requires 1 rack unit (RU) of space, which is 1.75

inches (44.45 mm) high.

CAUTION For stability, load the rack from the bottom to the top, with the

heaviest devices on the bottom. A top-heavy rack is likely to

be unstable and might tip over.

4 Cisco 250 Series Smart Switches

To install the switch into a 19-inch standard chassis:

STEP 1Place one of the supplied brackets on the side of the switch so that

the four holes of the brackets align to the screw holes, and then use

the four supplied screws to secure it.

STEP 2Repeat the previous step to attach the other bracket to the opposite

side of the switch.

STEP 3After the brackets are securely attached, the switch is now ready to

be installed into a standard 19-inch rack.

Wall Mounting

To mount the Cisco 250 Series Smart Switches to a wall:

STEP 1Determine where you want to mount the device. Verify that the

surface is smooth, flat, dry, and sturdy.

STEP 2Drill two pilot holes into the surface of the wall 94 mm apart.

STEP 3Insert a screw into each hole, leaving a gap between the surface

and the base of the screw head.

STEP 4Place the bottom of the switch over the screws and slide the

switch down until the screws fit snugly into the slots.

WARNING Insecure mounting may damage the device or cause injury.

Cisco is not responsible for damages incurred by insecure wall

or ceiling mounting.

400925

Cisco 250 Series Smart Switches 5

Connecting Network Devices

To connect the smart switch to the network:

STEP 1Connect the Ethernet cable to the Ethernet port of a computer,

printer, network storage, or other network device.

STEP 2Connect the other end of the Ethernet cable to one of the

numbered smart switch Ethernet ports.

The LED of the port lights if the device connected is active. Refer to

Features of the Cisco 250 Series Smart Switches for details

about the different ports and LEDs on each switch.

STEP 3Repeat Step 1 and Step 2 for each device you want to connect to

the smart switch.

NOTE Cisco strongly recommends using Cat5 or better cable for Gigabit

connectivity. When you connect your network devices, do not exceed

the maximum cabling distance of 100 meters (328 feet). It can take up to

one minute for the attached devices or the LAN to be operational after it

is connected. This is normal behavior.

Power over Ethernet Considerations

WARNING The switch is to be connected only to PoE networks without

routing to the outside plant.

If your switch is one of the Power over Ethernet (PoE) models, consider the

following power requirement:

250 Series Switches with Power Over Ethernet

Model Power

Dedicated to

PoE

Number of Ports

Supporting PoE

PoE Standard

Supported

SF250-48HP 195 Watts 1—48 802.3af/at

SG250-10P 62 Watts 1—8 802.3af/at

SG250-26HP 100 Watts 1—24 802.3af/at

SG250-26P 195 Watts 1—24 802.3af/at

6 Cisco 250 Series Smart Switches

CAUTION Consider the following when connecting switches capable of

supplying PoE:

The PoE models of the switches are PSE (Power Sourcing

Equipment) that are capable of supplying DC power to

attaching PD (Powered Devices). These devices include VoIP

phones, IP cameras, and wireless access points. The PoE

switches can detect and supply power to pre-standard

legacy PoE Powered Devices. Due to the support of legacy

PoE, it is possible that a PoE switch acting as a PSE may

mistakenly detect and supply power to an attaching PSE,

including other PoE switches, as a legacy PD.

Even though PoE switches are PSE, and as such should be

by another PSE due to false detection. When this happens,

the PoE switch may not operate properly and may not be

able to properly supply power to its attaching PDs.

To prevent false detection, you should disable PoE on the

ports on the PoE switches that are used to connect to PSEs.

You should also first power up a PSE device before

connecting it to a PoE switch. When a device is being falsely

detected as a PD, you should disconnect the device from the

PoE port and power recycle the device with AC power

before reconnecting its PoE ports.

Cisco 250 Series Smart Switches 7

Configuring the Cisco 250 Series Smart

Switches

Before You Begin

Verify the managing computer requirements in the product release notes.

Configuring Your Switch Using the Web-based Interface

To access the switch by using the web-based interface, you must know

the IP address the switch is using. The switch uses the factory default IP

address of 192.168.1.254, with a subnet of /24.

When the switch is using the factory default IP address, the System LED

flashes continuously. When the switch is using a DHCP server-assigned IP

address or an administrator has configured a static IP address, the System

LED is a steady green (DHCP is enabled by default).

NOTE If you are managing the switch through a network connection and

the switch IP address is changed, either by a DHCP server or manually,

your access to the switch will be lost. You must enter the new IP address

the switch is using into your browser to use the web-based interface.

To configure the smart switch:

STEP 1Power on the computer and the switch.

STEP 2Connect the computer to any network port on the front panel of the

switch.

STEP 3Set up the IP configuration on your computer.

a. If the switch is using the factory default IP address of

192.168.1.254/24, you must chose an IP address for the

computer in the range of 192.168.1.2—192.168.1.253 that is not

already in use.

b. If the IP addresses is assigned by a DHCP server, make sure

the DHCP server is running and can be reached from the

switch and the computer. It might be necessary to disconnect

and reconnect the devices for them to discover their new IP

addresses from the DHCP server.

NOTE Details on how to change the IP address on your computer

depend upon the type of architecture and operating system you are

using. Use the computer Help and Support functionality to search

for “IP Addressing.”

454

8 Cisco 250 Series Smart Switches

STEP 4Open a Web browser window. If you are prompted to install an

ActiveX plug-in when connecting to the device, follow the prompts

to accept the plug-in.

STEP 5Enter the switch IP address in the address bar and press Enter. For

example, http://192.168.1.254.

The Switch Login Page

displays.

STEP 6Enter the default login information:

•Username is cisco

•Default password is cisco (passwords are case sensitive)

STEP 7Click Log In.

If this is the first time that you have logged on with the default

username and password, the Change Password page opens. The

rules for constructing a new password are displayed on the page.

STEP 8Enter a new password and confirm the password.

NOTE Password complexity is enabled by default. The password

must comply with the default complexity rules or it can be disabled

temporarily by checking Disable next to the Password Strength

Enforcement option.

STEP 9Click Apply.

CAUTION Make sure that any configuration changes made are saved

before exiting from the web-based interface by clicking on

the Save icon. Exiting before you save your configuration will

result in all changes being lost.

The Getting Started window displays. You are now ready to configure the

switch. Refer to your Administration Guide for further information.

Cisco 250 Series Smart Switches 9

Troubleshoot Your Connection

If you cannot access your switch from the web-based interface, the switch

may not be reachable from your computer. You can test network

connections by using ping on a computer running Windows:

STEP 1Open a command window by using Start > Run and enter cmd.

STEP 2At the Command window prompt enter ping and the smart switch

IP address. For example ping 192.168.1.254 (the default IP

address of the smart switch).

If you can reach the switch, you should get a reply similar to the

following:

Pinging 192.168.1.254 with 32 bytes of data:

Reply from 192.168.1.254: bytes=32 time<1ms TTL=128

If you cannot reach the switch, you should get a reply similar to the

following:

Pinging 192.168.1.254 with 32 bytes of data:

Request timed out.

10 Cisco 250 Series Smart Switches

Possible Causes and Resolutions

The Switch is not Powering on

•Verify the power cord is plugged firmly into the switch and into the

power outlet.

•Verify that the power outlet is active.

•Verify that the computer is on.

•Replace the power adapter, before replacing the switch, if the situation

continues.

Bad Ethernet connection

•Check the LEDs for proper indications.

•Check the connectors of the Ethernet cable to ensure that they are

firmly plugged into the switch and your computer.

•Use a different Ethernet cable or port.

IP Addressing Issues

•The Cisco switches can also be accessed by the Cisco FindIT Network

Discovery Utility that automatically discovers all Cisco Small

Business devices in the same local network segment as your computer.

You can view device information including the current IP address,

download the latest firmware for the device, or launch the product

configuration utility to view and configure the settings. For more

information, see www.cisco.com/go/findit.

•Verify that you are using the correct IP address of the switch. The

System LED provides an indication of where the switch received the IP

address.

•Make sure that no other device is using the same IP address as the

switch.

No IP route

If the switch and your computer are in different IP subnets, you need

one or more routers to route the packets between the two subnets.

Unusually long access time

Due to the standard spanning tree loop detection logic, adding new

connections may take 30 to 60 seconds for the affected interfaces

and/or LAN to become operational.

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