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The Catalyst 3750 family of switches—also referred to as the switches—are stackable Ethernet switches to which you can connect devices like Cisco IP Telephones, Cisco Wireless Access Points workstations, and other network devices such as servers, routers, and other switches. This chapter provides a functional overview of the Catalyst 3750 switch models. These topics are included:
The switches can be deployed as backbone switches, aggregating 10BASE-T, 100BASE-TX, and 1000BASE-T Ethernet traffic from other network devices. Refer to the switch software configuration guide for examples showing how you might deploy the switches in your network.
Figure 2-1 through Figure 2-4 show the Catalyst 3750 switches.
These are the switch features:
The Catalyst 3750-24TS 10/100 ports are numbered 1 through 24. The ports are grouped in pairs. The first member of the pair (port 1) is above the second member (port 2) on the far left, as shown in Figure 2-1. Port 3 is above port 4, and so on. The SFP port numbers are numbered 1 (left) and 2 (right).
The 10/100/1000 ports on the Catalyst 3750G-24T and 3750G-24TS are grouped in pairs. The first member of the pair (port 1) is above the second member (port 2) on the left, as shown in Figure 2-2 and Figure 2-3. Port 3 is above port 4, and so on. In Figure 2-3 the SFP port are numbered 25 to 28.
The Catalyst 3750-48TS 10/100 ports are numbered 1 through 48. The ports are grouped in pairs. The first member of the pair (port 1) is above the second member (port 2) on the far left, as shown in Figure 2-1. Port 3 is above port 4, and so on. The SFP port numbers are 1 (top) and 2 (bottom) and so on.
You can set the 10/100 on the switch to operate in any combination of half duplex, full duplex, 10 Mbps or 100 Mbps. You can set the 10/100/1000 ports to operate in 10 Mbps, 100 Mbps, or 1000 Mbps in full duplex. You can also set these ports for speed and duplex autonegotiation in compliance with IEEE 802.3ab. (The default setting is autonegotiate.) When set for autonegotiation, 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. In all cases, the attached device must be within 100 meters (328 feet).
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Note 100BASE-TX and 1000BASE-T traffic requires
Category 5 cable. 10BASE-T
traffic can use Category 3 or Category 4 cables. When connecting the switch to workstations, servers, routers, and Cisco IP Phones, be sure that the cable is a straight-through cable. When connecting the switch to switches or hubs, use a crossover cable. When using a straight-through or crossover cable for 1000BASE-T connections, be sure to use a twisted four-pair, Category 5 cable for proper operation. Pinouts for the cables are described in "Connector and Cable Specifications." |
On the Catalyst 3750 switches, the small form-factor pluggable (SFP) module slots support the SFP modules listed in the Catalyst 3750 release notes.
The Catalyst 3750 switch uses Gigabit Ethernet SFP modules to establish fiber-optic connections. These laser optical transceiver modules are field-replaceable, and you can insert them into an SFP module slot. You use fiber-optic cables with LC connectors to connect to an SFP module. You can use the SFP modules for Gigabit uplink connections to other switches.
The SFP modules support 850 to 1550 nm nominal wavelengths. The
Catalyst 3750 models support these Cisco SFP options:
The two SFP modules are inserted into SFP module slots on the front of the Catalyst 3750 switches. These field-replaceable modules provide the uplink optical interfaces, laser send (TX) and laser receive (RX).
For more information about these SFP modules, refer to your SFP module documentation.
You can use the switch LEDs to monitor switch activity and its performance. Figure 2-5 shows the Catalyst 3750-24TS, 3750G-24T, 3750G-24TS, and 3750-48TS LEDs and the Mode button that you use to select one of the port modes.
All of the LEDs described in this section are visible on the Cluster Management Suite (CMS) home page. The switch software guide describes how to use CMS to configure and monitor individual switches and switch clusters.
| 1 | 6 | ||
| 2 | 7 | ||
| 3 | 8 | ||
| 4 | 9 | ||
| 5 |
The System LED shows whether the system is receiving power and is functioning properly. Table 2-1 lists the LED colors and their meanings.
| Color | System Status |
|---|---|
For information on the System LED colors during power-on self-test (POST), see the "Connecting to the 10/100 and 10/100/1000 Ports" section.
The RPS LED shows the RPS status. Table 2-2 lists the LED colors and their meanings.
For more information about the Cisco RPS 300, refer to the Cisco RPS 300 Redundant Power System Hardware Installation Guide. For more information about the Cisco RPS 675, refer to the Cisco RPS 675 Redundant Power System Hardware Installation Guide.
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Note The Cisco RPS 300 does not support the Catalyst 3750G-24TS switches. |
The Master LED shows the stack master status. Table 2-2 lists the LED colors and their meanings.
Table 2-3 Master LED
| Port Mode | Description |
|---|---|
An error occurred when the switch was selecting the stack master switch or a stack error. |
Each RJ-45 port and SFP 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 modes determine the type of information displayed through the port LEDs. Table 2-4 lists the mode LEDs and their associated port mode and meaning.
To select or change a mode, press the Mode button until the desired mode is highlighted. When you change port modes, the meanings of the port LED colors also change. Table 2-5 explains how to interpret the port LED colors in different port modes.
If your switches are stacked and you press the Mode button on any one of the switches in the stack, all the switches in the stack 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 switches in the stack also display SPEED.
| Mode LED | Port Mode | Description |
|---|---|---|
The port duplex mode: full duplex or half duplex. Note The 10/100/1000 ports operate only in full-duplex mode. |
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The StackWise port status. See the "Stack LED" section for more information. |
Table 2-5 Meaning of LED Colors in Different Modes on the Switch
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 position of a switch in a stack. Figure 2-6 shows a magnified view of the LEDs on the first switch, which is member number 8 of the stack. For example, if you press the Mode button to select the stack member on this switch, the port LED 8 flashes green because this represents the member number of this switch. The port
LEDs 3 and 4 display continuous green as these represent the member numbers of other switches in the stack. The other port LEDs are off because there are no more members in the stack.
When the stack LED is selected, these LEDs are green when the StackWise ports (located on the switch rear panel) are up, and they are amber when the ports are down:
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Note If both the port LEDs are green on all the switches in the stack, the stack is operating at full bandwidth (32 Gbps). If any of the port LEDs are not green, the stack is not operating at full bandwidth. |
The switch rear panels have an AC power connector, an RPS connector, an RJ-45 console port, and two StackWise ports, which are described in this section. (See Figure 2-7 and Figure 2-8.)
The Catalyst 3750 switch ships with a 0.5-meter StackWise cable (72-2632-XX CABASY) that you can use to connect the StackWise ports.
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Caution Use only approved cables (72-2632-XX CABASY, 72-2633-XX CABASY, 72-2634-XX CABASY) and connect only to like Cisco equipment. Equipment might be damaged if connected to non-approved cables or equipment. |
You can order these additional StackWise cables from your Cisco sales representative:
The switch is powered through the internal power supply. You can also connect the Cisco RPS 300 or the Cisco RPS 675 to provide backup power if the switch internal power supply should fail.
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Note The Catalyst 3750 switch and the Cisco RPS 300 or RPS 675 should be connected to the same AC power source. |
The internal power supply is an autoranging unit that supports input voltages between 100 and 240 VAC. Use the supplied AC power cord to connect the AC power connector to an AC power outlet.
Specific Cisco RPS modes support specific Catalyst 3750 switches:
The Cisco RPS 300 has two output levels: -48V and 12V with a total maximum output power of 300W. Use the supplied RPS connector cable to connect the RPS to the switch.
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Note The Cisco RPS 300 does not support the Catalyst 3750G-24TS switches. |
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Warning Attach only the Cisco RPS (model PWR300-AC-RPS-N1) to the RPS receptacle. |
The RPS is a redundant power system that can support six external network devices and provides 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. For more information on the Cisco RPS 300, refer to the Cisco RPS 300 Redundant Power System Hardware Installation Guide.
The Cisco RPS 675 has two output levels: -48V and 12V with a total maximum output power of 675W. Use the supplied RPS connector cable to connect the RPS to the switch.
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Warning Attach only the Cisco RPS (model PWR675-AC-RPS-N1=) to the RPS receptacle. |
The RPS is a redundant power system that can support six external network devices and provides 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. For more information on the Cisco RPS 675, refer to the Cisco RPS 675 Redundant Power System Hardware Installation Guide.
You can connect the switch to a PC by means of the console port and the supplied RJ-45-to-DB-9 female 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. For console port and adapter pinout information, see the "Connector and Cable Specifications" section.
The Catalyst 3750 switches offer several management options:
CMS is a graphical user interface that can be launched from anywhere in your network through a web browser such as Netscape Communicator or Microsoft Internet Explorer. CMS is already installed on the switch, and no additional installation is required. From CMS, you can fully configure and monitor a switch or switch clusters, display network topologies to gather link information, and display switch images to modify switch- and port-level settings. For more information, refer to the switch software configuration guide on Cisco.com, and the online help for this application.
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. Refer to the Catalyst 3750 Switch Command Reference on Cisco.com for more information.
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 a Simple Network Management Protocol (SNMP) platform. Refer to the CiscoView documentation for more information.
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 Management Information Base (MIB) extensions and four Remote Monitoring (RMON) groups. Refer to the switch software configuration guide on Cisco.com and the documentation that came with your SNMP application for more information.
Cisco IE200 Series Configuration Registrar is a network management device that works with embedded 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.
Refer to the switch software configuration guide on Cisco.com for network configuration concepts and examples of using the switch to create dedicated network segments and interconnecting the segments through Gigabit Ethernet connections.
Posted: Thu May 29 13:11:11 PDT 2003
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