Catalyst 3550 Multilayer Switch Hardware Installation Guide, October 2004
Product Overview
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Product Overview

Table Of Contents

Product Overview

Features

Front-Panel Description

10/100 and 10/100/1000 Ports

10/100 Inline Power Ports

100BASE-FX Ports

GBIC Module Slots

LEDs

System LED

RPS LED

Port LEDs and Modes

Rear-Panel Description

AC Power Connector

Cisco RPS Connector

Console Port

Management Options

Network Configurations


Product Overview


The Catalyst 3550 family of multilayer switches—also referred to as the switches—are stackable Ethernet switches to which you can connect workstations, Cisco IP Phones, and other network devices such as servers, routers, and other switches. These switches also can be deployed as backbone switches, aggregating Gigabit Ethernet traffic from other network devices.

This chapter provides a functional overview of the Catalyst 3550 switch models. These topics are included:

Features

Front-Panel Description

Rear-Panel Description

Management Options

Features

Figure 1-1 and Figure 1-2 show the Catalyst 3550 switch models, and Table 1-1 describes the switch features.

Figure 1-1 Catalyst 3550-12T and 3550-12G Switch Models

Figure 1-2 Catalyst 3550-24, 3550-24-DC, 3550-FX, 3550-24PWR, and 3550-48 Switch Models

Table 1-1 Switch Features 

Feature
Description

Hardware

2 or 10 Gigabit Ethernet 10BASE-T/100BASE-TX/1000BASE-T ports and 2 or 10 GBIC1 -based Gigabit Ethernet slots (Catalyst 3550-12T and 3550-12G switches)

24 or 48 10BASE-T/100BASE-TX Ethernet ports and 2 GBIC-based Gigabit Ethernet slots (Catalyst 3550-24, 3550-24DC, 3550-24PWR, and 3550-48 switches)

24 100BASE-FX ports (Catalyst 3550-24-FX switch)

Supports GBIC modules:

1000BASE-SX

1000BASE-LX/LX

1000BASE-ZX

1000BASE-T

GigaStack

CWDM

Configuration

Supports Layer 3 routing (Catalyst 3550-12T and 3550-12G switches)

Supports optional Layer 3 routing (Catalyst 3550-24, 3550-24DC, 3550-24-FX, 3550-24PWR, and 3550-48 switches)

Autonegotiates speed and duplex operation on 10/100 or 10/100/1000 Ethernet ports

Supports up to 12,000 MAC addresses (Catalyst 3550-12T and 3550-12G switches)

Supports up to 8,000 MAC addresses (Catalyst 3550-24, 3550-24DC, 3550-24-FX, 3550-24PWR, and 3550-48 switches)

Checks for errors on a received packet, determines the destination port, stores the packet in shared memory, and then forwards the packet to the destination port

Power Redundancy

Connection for optional Cisco RPS 300 redundant power system or the Cisco RPS 675 redundant power system that operates on AC input and supplies backup DC power to the switch

Feature
Description

Inline Power2

Power for Cisco IP Phones and access points from all 10/100 Ethernet ports

Auto-detection and control of inline power on a per-port basis on all 10/100 ports

Support for fan-fault and overtemperature detection through the Network Assistant and the device manager.

1 Gigabit Interface Converter

2 Only Catalyst 3550-24PWR switch


 

Front-Panel Description

The switch front panel includes the 10/100 or 10/100/1000 Ethernet ports or 100BASE-FX ports, GBIC module slots, and switch LEDs as shown in Figure 1-3 and described on the following pages.


Note Figure 1-3 shows the Catalyst 3550-12T switch as an example. All the Catalyst switches have similar components.


Figure 1-3 Switch Front Panel

1

Mode button

4

10/100 or 10/100/1000 Ethernet ports or 100BASE-FX ports1

2

Switch LEDs

5

GBIC slots

3

Port LEDs

   

1 Port numbering is from left to right, with port 1 on the far left. For ports grouped in pairs, the first member of the pair (port 1) is above the second member (port 2). The GBIC slots are numbered 1 (left) and 2 (right) or 1 (above) and 2 (below).


10/100 and 10/100/1000 Ports

The Fast Ethernet (10/100-Mbps) and Gigabit Ethernet (10/100/1000-Mbps) ports use standard RJ-45 connectors and Ethernet pinouts with internal crossovers. The maximum cable length is 328 feet (100 meters). 100BASE-TX and 1000BASE-T traffic requires twisted four-pair Category 5 cable. 10BASE-T traffic can use Category 3 or Category 4 cable.

Fast Ethernet ports operate at 10 or 100 Mbps in either full- or half-duplex mode. In full-duplex mode, two stations can send and receive traffic at the same time. Normally, 10-Mbps ports operate in half-duplex mode, which means that stations can either receive or send traffic.

You can configure interface speed on Fast Ethernet and Gigabit Ethernet ports. On Fast Ethernet ports, you can configure the duplex mode to full, half, or autonegotiate. On Gigabit Ethernet ports, you can configure ports to full-duplex mode or to autonegotiate; half-duplex mode is not supported.

The default setting is autonegotiate. At this setting, the port senses the speed and duplex settings of the attached device and advertises its own capabilities. If the connected device also supports autonegotiation, the switch port negotiates the best connection (that is, the fastest line speed that both devices support and full-duplex transmission if the attached device supports it) and configures itself accordingly.

10/100 Inline Power Ports

The 10/100 ports on the Catalyst 3550-24PWR switch provide protocol support for Cisco IP Phones and Cisco Aironet Access Points:

Provide -48 VDC power to all Cisco IP Phones and Cisco Aironet Access Points

Automatically detect a Cisco IP Phone or an access point that is connected

On a per-port basis, you can control whether or not a Catalyst 3550-24PWR 10/100 port automatically provides power when an IP phone or an access point is connected. There are two inline power settings for each 10/100 port: Auto and Never. When you select the Auto setting for inline power on a port, the port only provides power if an IP phone or an access point is connected to it. The Auto setting is the default. However, when you select the Never setting for inline power on a port, the port does not provide power even if a Cisco IP phone or an access point is connected to it.

100BASE-FX Ports

The 100BASE-FX ports use 50/125- or 62.5/125-micron multimode fiber-optic cabling. In full-duplex mode, the cable length from a switch to an attached device cannot exceed 6,562 feet (2 kilometers).

The 100BASE-FX ports operate only at 100 Mbps in either full- or half-duplex mode and do not support autonegotiation. The half-duplex mode is the default setting.

You can connect a 100BASE-FX port to an SC or ST port on a target device by using one of the MT-RJ fiber-optic patch cables listed in Table B-1.

GBIC Module Slots

You cannot configure speed or duplex mode on GBIC slots, but for certain types of GBICs, you can configure speed to not negotiate (nonegotiate) if connected to a device that does not support autonegotiation.

The GBIC module slots support these modules to provide flexibility in media and distance options:

1000BASE-T GBIC module for copper connections of up to 328 feet (100 meters).

1000BASE-SX GBIC module for fiber-optic connections of up to 1,804 feet (550 meters) multimode only.

1000BASE-LX/LH GBIC module for fiber-optic connections of up to 32,810 feet (10 kilometers) single mode or 1,804 feet (550 meters) multimode.

1000BASE-ZX GBIC module for fiber-optic connections of up to 328,000 feet (100 kilometers) single mode only.

GigaStack GBIC module for creating a 1-Gbps stack configuration of up to nine supported switches. The GigaStack GBIC supports one full-duplex link (in a point-to-point configuration) or up to nine half-duplex links (in a stack configuration) to other Gigabit Ethernet devices. When you use the required Cisco proprietary signaling and cabling, the maximum distance for a GigaStack GBIC-to-GigaStack GBIC connection is 3 feet (1 meter).

Coarse Wave Division Multiplexing (CWDM) GBIC modules for fiber-optic connections of up to 393,719 feet (120 kilometers) single mode only.

Cisco-approved CWDM GBIC modules have a serial EEPROM that contains the module serial number, the vendor name and vendor ID, a unique security code, and cyclic redundancy check (CRC). When a CWDM GBIC module is inserted in the switch, the switch software reads the EEPROM to check the serial number, vendor name and vendor ID, and recompute the security code and CRC. If the serial number, the vendor name or vendor ID, the security code, or CRC is invalid, the switch places the port in an error-disabled state.

For more information about GBICs, see the documentation included with your GBIC module and Related Publications, for a list of related documentation.

LEDs

You can use the switch LEDs to monitor switch activity and its performance. Figure 1-3 shows the LEDs and the Mode button that you use to select one of the port modes.

All of the LEDs described in this section except the utilization meter (UTIL) are visible on the device manager and through the Network Assistant.

System LED

The system LED shows whether the system is receiving power and is functioning properly. Table 1-2 lists the LED colors and their meanings.

Table 1-2 System LED 

Color
System Status

Off

System is not powered on.

Green

System is operating normally.

Amber

System is receiving power but is not functioning properly.


RPS LED

The RPS LED shows the RPS status. Table 1-3 lists the LED colors and their meanings.

Table 1-3 RPS LED 

Color
RPS Status

Off

RPS is off or not properly connected.

Solid green

RPS is connected and ready to provide back-up power, if required.

Blinking green

RPS is connected but is unavailable because it is providing power to another device (redundancy has been allocated to a neighboring device).

Solid amber

The RPS is in standby mode or in a fault condition. Press the Standby/Active button on the RPS, and the LED should turn green. If it does not, the RPS fan could have failed. Contact Cisco Systems.

Blinking amber

The internal power supply in a switch has failed, and the RPS is providing power to the switch (redundancy has been allocated to this device).


For more information about the Cisco RPS 300 or the Cisco RPS 675, see the documentation included with the RPS.

Port LEDs and Modes

Each RJ-45 port and GBIC module slot has a port LED. These port LEDs, as a group or individually, display information about the switch and about the individual ports. The port mode determines the type of information displayed through the port LEDs. Table 1-4 lists the mode LEDs and their associated port modes and meanings.

To select or change a mode, press the Mode button (or Mode label on the Catalyst 3550-48 switch) until the desired mode is highlighted. When you change port modes, the meanings of the port LED colors also change. Table 1-5 explains how to interpret the port LED colors in different port modes.

You can also use the Mode button to activate the Express Setup program or to clear the switch IP address and all switch settings. See the "Clearing the Switch IP Address and Configuration" section for more information.

Table 1-4 Port Mode LEDs 

Mode LED
Port Mode
Description

STATUS

Port status

The port status. This is the default mode.

UTIL1

Switch utilization

The current bandwidth in use by the switch. (See Figure 1-4 through Figure 1-8.)

DUPLX

Port duplex mode

The port duplex mode: full duplex or half duplex.

SPEED

Port speed

The port operating speed: 10, 100, or 1000 Mbps.

LINE PWR2

Port inline power

The inline power status: on or off.

1 Not available on Catalyst 3550-24PWR switches

2 Available only on Catalyst 3550-24PWR switches


 

Table 1-5 Meaning of LED Colors in Different Modes 

Port Mode
LED Color
Meaning

STATUS
(port status)

Off

No link, or port was administratively shut down.

Solid 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, CRC errors, and alignment and jabber errors are monitored for a link-fault indication.

Solid amber

Port is blocked by Spanning Tree Protocol (STP) and is not forwarding data.

Note 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 or receiving packets.

UTIL1
(utilization)

Green

Port LEDs display backplane utilization on a logarithmic scale. (See Figure 1-4 through Figure 1-8.)

Amber

Peak total backplane utilization over the last 24 hours.

DUPLX
(duplex)

Off

Port is operating in half duplex.

Green

Port is operating in full duplex.

SPEED

10/100 and 10/100/1000 ports

Off

Port is operating at 10 Mbps.

Green

Port is operating at 100 Mbps.

Blinking green

Port is operating at 1000 Mbps.

GBIC ports

Off

Port is not operating.

Blinking green

Port is operating at 1000 Mbps.

LINE PWR2

Off

Inline power is off.

Green

Inline power is on.

If the Cisco IP Phone is receiving power from an AC power source, the port LED is off even if the IP phone is connected to the switch port. The LED turns green only when the switch port is providing power.

1 Not available on Catalyst 3550-24PWR switches

2 Available only on Catalyst 3550-24PWR switches


Bandwidth Utilization

The UTIL mode on the switch shows the current bandwidth in use by the switch. (See Figure 1-4 to Figure 1-8.) If all possible port LEDs are green, bandwidth utilization is in the 50 to 100 percent range. Every port LED that is off (black) divides this range by two.


Note The port LEDs on the Catalyst 3550-24PWR switch do not show bandwidth utilization.


Figure 1-4 shows the bandwidth utilization percentages displayed by the LEDs on the Catalyst 3550-12T switch.

Figure 1-4 Bandwidth Utilization for the Catalyst 3550-12T

Figure 1-5 shows the bandwidth utilization percentages displayed by the LEDs on the Catalyst 3550-12G switch.

Figure 1-5 Bandwidth Utilization for the Catalyst 3550-12G

Figure 1-6 shows the bandwidth utilization percentages displayed by the LEDs on the Catalyst 3550-24 and 3550-24-DC switches.

Figure 1-6 Bandwidth Utilization for the Catalyst 3550-24 and 3550-24-DC

Figure 1-7 shows the bandwidth utilization percentages displayed by the LEDs on the Catalyst 3550-48 switch.

Figure 1-7 Bandwidth Utilization for the Catalyst 3550-48

Figure 1-8 shows the bandwidth utilization percentages displayed by the LEDs on the Catalyst 3550-24-FX switch.

Figure 1-8 Bandwidth Utilization for the Catalyst 3550-24-FX

Rear-Panel Description

Other than the Catalyst 3550-24-DC switch, the switch rear panels have an AC power connector, an RPS connector, and an RJ-45 console port, which are shown in Figure 1-9 and described in this section.

The rear panel of the 3550-24-DC switch has a DC power connector (also referred to as the terminal block header), an RJ-45 console port, and a ground lug. The switch is shipped with a terminal block plug in the DC power connector.


Note Figure 1-9 shows the Catalyst 3550-12T switch as an example. All the Catalyst switches have similar components.


Figure 1-9 Switch Rear Panel

1

RPS connector

3

Console port

2

AC power connector

4

Fan exhaust


AC Power Connector

For AC-powered switches, the internal power supply is an autoranging unit that supports input voltages between 100 and 240 VAC.

For the Catalyst 2440-24-DC power information, see "DC Power Connections."

Cisco RPS Connector

For protection against a power supply failure, you can connect a Cisco RPS to the switch. The Cisco RPS can support six external network devices and provide power to one failed device at a time. It automatically senses when the internal power supply of a connected device fails and provides power to the failed device, preventing loss of network traffic.

The Cisco RPS 300 has two output levels: -48 V and 12 V with a total maximum output power of 300 W. The Cisco RPS 675 has two output levels: -48 V and 12 V with a total maximum output power of 675 W.

These Cisco RPS models support the Catalyst 3550 switches:

Cisco RPS 300 (model PWR300-AC-RPS-N1) supports the
Catalyst 3550-12T, 3550-12G, 3550-24, 3550-FX, and 3550-48 switches.

Cisco RPS 675 (model PWR675-AC-RPS-N1) supports the
Catalyst 3550-12T, 3550-12G, 3550-24, 3550-FX, 3550-24PWR, and 3550-48 switches.

The Cisco RPS 300 does not support the Catalyst 3550-24-DC or 3550-24PWR switch. The Cisco RPS 675 does not support the Catalyst 3550-24-DC switch.

The RPS 300 and RPS 675 models also support other Cisco devices. See the RPS documentation for more information.

Console Port

You can connect the switch to a PC by using the console port and the supplied RJ-45-to-DB-9 adapter cable. If you want to connect the switch console port to a terminal, you need to provide an RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) containing that adapter from Cisco.

Management Options

The Catalyst 3550 switches offer several management options:

Network Assistant

The Network Assistant is a GUI-based application that you can install and run on your desktop; you do not need a web browser to run it. You can use Network Assistant to manage and monitor switch clusters or standalone devices. For more information, see the Getting Started with Cisco Network Assistant guide and the Network Assistant online help.

Device manager

You can use the device manager, which is in the switch memory, to manage individual and standalone switches. The device manager is accessible after you have run the Express Setup program (see the getting started guide for more information about running Express Setup). Use the device manager to perform basic switch configuration and monitoring. You can access the device manager from anywhere in your network through a web browser.

To launch the device manager, enter the switch IP address in the web browser, and press Enter. The device manager page appears.

See the device manager online help for more information.

Cisco IOS command-line interface (CLI)

The switch CLI is based on Cisco IOS software and is enhanced to support desktop-switching features. You can fully configure and monitor the switch and switch cluster members from the CLI. You can access the CLI either by connecting your management station directly to the switch console port or by using Telnet from a remote management station. See the command reference on Cisco.com for more information.

SmartPort Macros

SmartPort macros provide a convenient way to save and share common switch configurations. You can use SmartPort macros to enable features and settings based on the location of a switch in the network and for mass configuration deployments across the network.

Cisco provides a collection of pretested, Cisco-recommended baseline SmartPort macros for Catalyst switches. You can use the macros to build and deploy Cisco-recommended network designs and configurations. For more information about SmartPort macros, see the software configuration guide and the SmartPort information available on Cisco.com.

CiscoView application

The CiscoView device-management application displays the switch image that you can use to set configuration parameters and to view switch status and performance information. The CiscoView application, which you purchase separately, can be a standalone application or part of an SNMP platform. See the CiscoView documentation for more information.

SNMP network management

You can manage switches from a SNMP-compatible management station that is running platforms such as HP OpenView or SunNet Manager. The switch supports a comprehensive set of MIB extensions and four Remote Monitoring (RMON) groups. See the software configuration guide on Cisco.com and the documentation that came with your SNMP application for more information.

Cisco Intelligence Engine 2100 (IE2100)

Cisco IE200 Series Configuration Registrar is a network management device that works with embedded Cisco Networking Services (CNS) agents in the switch software. You can automate initial configurations and configuration updates by generating switch-specific configuration changes, sending them to the switch, executing the configuration change, and logging the results.

Network Configurations

See the software configuration guide on Cisco.com for network configuration concepts and examples.