|
|
This chapter describes the features and the hardware components of the Catalyst 5000 series switches and includes the following sections:
This section describes the Catalyst 5000 series hardware features. For software feature descriptions, refer to the Catalyst 5000 Series Software Configuration Guide.
The following sections describe features common to all three supervisor engines and those specific to individual supervisor engines.
Features common to all three supervisor engine modules are as follows:
Features common to Supervisor Engines I and II are as follows:
Features common to Supervisor Engines II and III are as follows:
Features specific to Supervisor Engine III are as follows:
The Catalyst 5000 series switch architecture is based on high-speed switching network principles, using a queuing model for input. Each switch port maintains its own frame buffer memory. Each frame is stored in a frame buffer before it is forwarded to the next port.
Bus arbitration and hardware-based switching are shared among all ports. Together, they control the destination of packet transfers and access to the data switching bus. The switch uses central bus arbitration and address recognition logic for all modules. Multiple copies are not required for high-speed broadcast and multicast frame forwarding because all ports simultaneously receive the same copy of the frame when it is sent on the backplane.
The Catalyst 5000 series media-independent backplanes (Catalyst 5505 and Catalyst 5500: 3.6-Gbps, Catalyst 5000 and Catalyst 5002: 1.2-Gbps) support a three-level priority request scheme. Two priorities are user selected, and the third is backplane based. The buses allow each port to perform a local flush and maintain a packet retry mechanism for outbound port congestion.
Hardware-based switching is a Catalyst 5000 series feature similar to the learning bridge or content-addressable memory (CAM) of other types of network switches and routers. Hardware-based switching automatically learns source MAC addresses and VLAN and port information and saves them in a RAM address table. Hardware-based switching uses these learned entries to forward packets to their destination addresses. Supervisor Engines II and III have a feature card that accommodates all the core switching logic and allows future upgrade options to new features and functions.
The Catalyst 5000 series switches have the following features:
All modules (including the supervisor engine if you have redundant supervisors), fans, and dual power supplies, support hot swapping. (Hot-swappable modules allow you to add, replace, or remove modules without interrupting the system power or causing other software or interfaces to shut down.) The supervisor engine enables switching and controls data across the switch backplane, so one supervisor engine must be present for the system to operate, or if redundant, one must be active for the system to operate.
When you remove or insert a switching module, the system does the following:
1 ) Scans the backplane for configuration changes.
2 ) Initializes all newly inserted switching modules, notes any removed interfaces, and places them in the administratively shutdown state.
3 ) Places any previously configured interfaces on the switching module back to the state they were in when they were removed. The system puts any newly inserted interfaces in the administratively shutdown state, as if they were present (but unconfigured) at boot time. If a similar switching-module type is reinserted into a slot, then its ports are configured and brought online up to the port count of the original switching module.
The system runs diagnostic tests on any new interface. If the tests pass, the system is operating normally. If the new switching module is faulty, the system resumes normal operation but leaves the new interfaces disabled. If the diagnostic tests fail and the system fails, remove the new switching module.
Caution To avoid erroneous failure messages, allow at least 15 seconds for the system to reinitialize, and note the current configuration of all interfaces before you remove or insert another switching module.
Environmental monitoring functions constantly monitor the internal temperature of the chassis. Each power supply monitors its own voltage and temperature and shuts itself down if it detects a critical condition. These reporting functions enable you to retrieve and display the present values of measured parameters, and display alarms on the console if any of the monitored parameters exceed defined thresholds.
The processor monitors the temperature inside the module compartment, and the power supplies use the normal and critical levels to monitor power supply voltages. If the temperature exceeds a defined threshold within a power supply, the power supply turns off. The switches shut down if they contain only one power supply. However, if a switch contains redundant power supplies, the switch shuts down only if both power supplies shut off. See the section "Power Supplies" in this chapter for temperature and voltage thresholds for the processor-monitored levels.
The environmental monitoring functions use three levels of status conditions to monitor the system:
The processor uses two status condition levels (normal and alarm) to monitor the air temperature in the module compartment. Sensors on the supervisor engine monitor the temperature of the cooling air that flows through the module compartment. If the air temperature exceeds a defined threshold, the system processor indicates an alarm condition using the supervisor engine status LED, SNMP traps, and command-line interface (CLI) displays. The processor stores the present alarm configuration for both temperature and DC voltage in nonvolatile random-access memory (NVRAM). You can retrieve information about these alarms later as a report of the last shutdown parameters.
The Catalyst 5000 series supports different combinations of network interface modules with different maximum port densities. Refer to the Catalyst 5000 Series Module Installation Guide for detailed module functionality.
A second type of address is the MAC-layer address, which is a standardized data link layer address that is required for every port or device that connects to a network. Other devices in the network use these addresses to locate specific ports in the network and to create and update routing tables and data structures. The switches assign and control the MAC-layer addresses of their interfaces.
Onboard memory consists of dynamic random-access memory (DRAM) for the default system software, Flash memory for downloading the system software, and NVRAM for the configuration file. Refer to the Catalyst 5000 Series Release Notes for the minimum memory requirements for each supervisor engine.
The Supervisor Engine III Flash memory contains a file system. You can use a variety of commands to manage the file system (such as cd, pwd, dir, delete, and copy). The file system includes the following devices:
For detailed information on using the PCMCIA Flash memory cards, see Chapter 7, "Removal and Replacement Procedures." For detailed information on configuring the supervisor engine to boot from PCMCIA Flash memory, see Chapter 5, "Configuring the Switch."
An electronically erasable programmable read-only memory (EEPROM) component on the supervisor engine stores module-specific information, such as the module serial number, part number, controller type, hardware revision, configuration information, and other details unique to each module. The supervisor engine EEPROM also contains an address allocator, which is a bank of 1024 hardware or MAC-level addresses, one for each possible VLAN in the system (4096 on Supervisor Engine III).
This section describes the Catalyst 5000 series hardware components.
The following sections describe standard and optional equipment available for each switch.
The Catalyst 5002 has the following standard equipment:
The Catalyst 5002 has optional switching modules.
The switches have the following standard equipment:
The switches have the following optional equipment:
This section describes the supervisor engine models.
Supervisor Engines I and II are available in three models:
Warning Invisible laser radiation may be emitted from the aperture ports of the 100BaseFX single-mode supervisor engine module. Avoid exposure and do not stare into open aperture.
Supervisor Engine III is available in two base units that can be configured with any of the uplink modules:
This section describes the front panel features of the supervisor engine modules. See Figure 2-6 for Supervisor Engine I and II features and Figure 2-7 for Supervisor Engine III features.
The LEDs on the supervisor engine front panel indicate the status of the system, which includes the supervisor engine, the power supplies, and the fan assembly. Table 2-1 describes LED operation.
| LED | Description |
|---|---|
| SYSTEM STATUS | The switch performs a series of self-tests and diagnostic tests. If all the tests pass, the LED is green. If any test fails, the LED is red. During system boot or if the module is disabled, the LED is red. If the redundant power supply is installed but not turned on or receiving input, the LED is orange. If the fan module fails, the LED is orange. |
| FAN | Status of whether or not the fan is operational. If the fan is operational, the LED is green. If the fan is not operational, the LED is red. |
| PS1 | Catalyst 5000, Catalyst 5505, and Catalyst 5500:
If the power supply in the left bay is operational, the LED is green. Catalyst 5002: If the power supply associated with the PS1 AC or DC receptacle is operational, the LED is green. |
| PS2 | Catalyst 5000, Catalyst 5505, and Catalyst 5500:
If the power supply in the right bay is operational, the LED is green. Catalyst 5002: If the power supply associated with the PS2 AC or DC receptacle is operational, the LED is green. |
| SWITCH LOAD | If the switch is operational, the switch load display indicates (as an approximate percentage) the current traffic load over the backplane (see Figure 2-8). |
| ACTIVE | If the supervisor engine is operational and active, the LED is green. If the supervisor engine module is in standby mode, the LED is orange. |
| SLOT 1 and SLOT 0 | Supervisor Engine III only: The PCMCIA SLOT 1 and SLOT 0 LEDs light when their respective slot 1 and slot 0 PCMCIA devices are accessed by the switch. |
| 100 Mbps 1000 Mbps | If the port is operating at 100 Mbps, the LED is green. If the port is operating at 1000 Mbps, the LED is green. |
| LINK | If the port is operational, the LED is green. If the link has been disabled by software, the LED is orange. If the link is bad and has been disabled due to a hardware failure, the LED flashes orange. If no signal is detected, the LED is off. |
The RESET button allows you to restart the switch.
The SWITCH LOAD display (see Figure 2-8) provides you with a visual approximation of the current traffic load across the backplane. The Supervisor Engine III SWITCH LOAD display has a vertical orientation but functions the same as the SWITCH LOAD display in Supervisor Engines I and II. The Supervisor Engine III SWITCH LOAD display indicates the current aggregate traffic load across all buses.
The CONSOLE port enables you to perform the following functions:
The CONSOLE port is a data communications equipment (DCE) DB-25 receptacle, which supports a DCE EIA/TIA-232 interface.
The CONSOLE port is an EIA/TIA-232 asynchronous, serial, full-featured data terminal equipment (DTE) connection with hardware flow control and an RJ-45 connector. A console port accessory kit with the necessary cabling and adapters is provided for making your terminal connection.
For detailed information on using this port, see "Connecting a Terminal to the Console Port" section in Chapter 4, "Installing the Switch."
The Flash memory (PCMCIA) card slots are for additional system PCMCIA-based Flash memory. You can use this Flash memory to store and run Cisco IOS images or to serve as an I/O device.
For detailed information on using the PCMCIA Flash memory cards, see Chapter 7, "Removal and Replacement Procedures." For detailed information on configuring the supervisor engine to boot from PCMCIA Flash memory, see Chapter 5, "Configuring the Switch."
The Fast Ethernet ports operate in full- or half-duplex mode. These ports support the following connectivity:
The Gigabit Ethernet ports operate in full-duplex mode only. These ports support the 1000BaseSX MMF interfaces, using SC connectors with multimode fiber-optic cable.
For detailed information on using these ports, see the section "Connecting to the Supervisor Engine Interface Ports" in Chapter 4, "Installing the Switch."
The system fan assembly provides cooling air for the supervisor engine, the interface modules, and the backplane. The fan assembly is located in the chassis.
The following figures show the direction of air flow in to and out of the switches:
If an individual fan within an assembly fails, the fan LED on the supervisor engine turns red. The supervisor engine fan assembly LED is described in Table 2-1.
Sensors on the supervisor engine monitor the internal air temperatures. If the air temperature exceeds a desired threshold, the environmental monitor displays warning messages. For specific threshold and status level descriptions, see the section "Environmental Monitoring" in this chapter.
To replace a fan assembly, see Chapter 7, "Removal and Replacement Procedures."
This section describes the Catalyst 5000 series power supplies. They differ for each switch.
The Catalyst 5000 and Catalyst 5500 switches support redundant AC-input and DC-input power supplies. When using dual power supplies, both must be the same type, that is, either AC-input or DC-input power. Each power supply has an individual power switch and a status LED on the supervisor engine.
Many telco organizations require a -48 VDC power supply to accommodate their power distribution systems. From an operational perspective, the DC power supply has the same characteristics as the AC version.
The AC-input power supply uses a power cord that connects each power supply to the site power source. The DC-input supplies are connected to the power source with heavy gauge wiring connected to a terminal block. The AC-input power supplies are shown in
Figure 2-12. The DC-input power supplies are shown in Figure 2-13.
Both AC-input or DC-input power supplies support redundant hot swapping. When power is removed from one supply, the redundant power feature causes the second supply to produce full power.
When two power supplies are installed and both are turned on, each concurrently provides approximately half of the required power to the system. If one power supply fails, the second power supply immediately takes full power to maintain uninterrupted system operation. Load sharing and fault tolerance are enabled automatically when the second power supply is installed; no software configuration is required.
Environmental monitoring and reporting functions enable you to maintain normal system operation by resolving adverse environmental conditions prior to loss of operation.
Each power supply monitors its own temperature and output voltages. If conditions reach critical thresholds, the system might shut down to avoid damaging equipment from excessive heat or electrical current.
The supervisor engine power supply status LEDs (PS1 and PS2) are described in Table 2-1.
The power supply front panel LEDs are described as follows:
The power supplies monitor their own internal temperature and voltages. Table 2-2 and Table 2-3 list temperature thresholds for the processor-monitored levels. The power supply is either within tolerance (normal) or out of tolerance (alarm level), as shown in Table 2-4.
| Parameter | Normal | Alarm |
|---|---|---|
| Temperature | < 45×C | > 45×C |
| Parameter | Normal | Alarm |
|---|---|---|
| Temperature | 10-55×C | > 55×C |
| Parameter | Critical | Normal | Critical |
|---|---|---|---|
| +5V | < 4.74V | 4.74 to 5.26V | > 5.26V |
| +12V | < 11.4V | 11.40 to 12.6V | > 12.6V |
| +24V | < 20V | 20.00 to 30V | > 30V |
The power supplies have a built-in fan; air enters the front of the fan (power-input end) and exits through the back. An air dam keeps the airflow separate from the rest of the chassis, which is cooled by the system fan assembly.
To replace a power supply, see Chapter 7, "Removal and Replacement Procedures."
The Catalyst 5002 is configured with either two internal AC-input power supplies or two internal DC-input power supplies. Each power supply has a status LED on the supervisor engine module.
The Catalyst 5002 dual power supplies normally operate in a load-sharing mode. If one power supply fails, the other supply fully powers the system without interruption.
In normal operation, each power supply concurrently provides approximately half of the required power to the system. If one power supply fails, the second power supply immediately assumes full power to maintain uninterrupted system operation. Load sharing and fault tolerance are automatically enabled.
The supervisor engine module front panel has two LEDs that provide power indications. The LEDs (PS1 and PS2) are described in Table 2-1.
|
|