Table Of Contents
Catalyst 4900M Switch Applications
Catalyst 4900M Switch Software Features
Rear Chassis Connections and Features
Environmental Monitoring of the Power Supplies
Power Management for the Catalyst 4900M Switch
Product Overview
This chapter describes the Catalyst 4900M switch, as well as system features and components.
This chapter contains these sections:
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Catalyst 4900M Switch Applications
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Catalyst 4900M Switch Applications
The Catalyst 4900M switch (see Figure 1-1) is designed for top-of-rack server aggregation. It simplifies the transition from 1 GB to 10 GB attached devices in the data center. The Cisco Catalyst 4900M is a top of rack Ethernet switch optimized for mixing 10/100/1000 and 10 Gigabit Ethernet access devices. It is a fixed Cisco IOS based Layer 2+ switch with 8 fixed wire speed X2 ports on the base unit with 2 optional half card slots. The half card slots can accommodate the following cards in any combination:
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The half cards provide a wide variety of combinations of Gigabit Ethernet and 10 Gigabit Ethernet media types. The half slots also provide investment protection for further additions of 1 GE and 10 GE media.
Figure 1-1 Catalyst 4900M Switch
The modules that fit into the open slots are:
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Figure 1-2 20-Port 1 GE RJ-45 (WS-X4920-GB-RJ45=)
Figure 1-3 4-Port X2 Wire Speed 10 Gigabit Ethernet (WS-X4904-10GE=)
Module type
10 Gigabit X2 fiber Ethernet switching module
Port duplex mode
Full duplex mode
Port speed
10 Gbps
Number of ports
4
Connector type
SC type
Cable type
MMF or SMF
Figure 1-4 8-Port X2 2:1 Oversubscribed 10 Gigabit Ethernet (WS-X4908-10GE=)
Note
The Catalyst 4900M switch has a 320-Gbps, nonblocking, full-duplex switching fabric, providing 250 million packets-per-second of switching capacity for high-speed applications. The Catalyst 4900M chassis has eight 10 Gigabit Ethernet ports and other ports as configured.
A removable automatic variable speed fan tray for low-noise operation at room temperature and removable and redundant 1000 W AC or 1000 W DC power supplies provide fault-tolerance protection for the switch. See the "Connecting Power to the Catalyst 4900M Switch" section on page 3-11.
Catalyst 4900M Switch Software Features
For up-to-date information on software features, refer to the release notes and software configuration guide for your software release.
Hardware System Features
The Catalyst 4900M switch is a high-performance dedicated Ethernet switch that fully integrates into the Catalyst family of switches using Catalyst 4500 series system software.
The following is an overview of the Catalyst 4900M hardware features:
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Switch Components
This section describes the Catalyst 4900M hardware components.
Traffic Ports
There are eight 10-Gigabit Ethernet uplink ports using X2 interfaces and other traffic ports depending on the switching modules installed.
TwinGig Modules
On the WS-4908-10GE modules only, TwinGig converter modules may be used in place of X2 modules if you need to provide 1 GB SFP connections. When you insert the TwinGig into one port, its neighbor automatically converts to 1 GE interfaces whether it has a TwinGig installed or not, so you need to group your TwinGigs next to one another. The neighboring port to a TwinGig port cannot support an X2.
Installation documentation for Cisco TwinGig converter modules can be found at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/hardware/install/notes/1757202.html
Rear Chassis Connections and Features
The Reset button is used to restart the switch. Use a paper clip or other small, pointed object to press the Reset button.
A console serial port (RJ-45) provides for switch management using standard console equipment. (See Figure 1-5.) A connector pinout table is provided in Appendix A, "Specifications," for the console and management ports.
The Management port on the rear panel offers the same TCP/IP based management services available via inband access (telnet SNMP etc.). IP address configuration via BOOTP is supported on the Management port; it also supports image download to the switch.
A USB connector is provided for future expansion.
The Compact Flash port accepts both 64-MB and 128-MB Type 1 compact Flash cards. You can use it for file transfer tasks such as loading a new software image. The Flash card is optional and can be obtained from third-party suppliers.
For more information, refer to Using the Compact Flash on the Catalyst 4500 Series Supervisor Engines at the following URL:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/configuration/notes/OL_2788.html
Figure 1-5 View of the Rear Panel
Input OK (power supply)
Console port
Output OK (power supply)
Management port
Fan Status LED
USB connection
Reset button
Compact Flash slot
Front Panel LEDs
Figure 1-6 Front LEDs
The LEDs on the front and rear panel of the Catalyst 4900M switch (see Figure 1-5 and Figure 1-6 ) provide status information as follows:
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A description of the LED functions is provided in Table 1-1.
Table 1-1 LED Descriptions
System
(front)
Green
Red
Flashing
Yellow
OffAt startup, the Catalyst 4900M performs a series of diagnostic tests:
All tests pass
A test other than an individual port test fails
System boot or diagnostic tests in progress
System is in rommon mode or a power supply has failed
Switch is disabledCON
(rear)
Green
Off
10/100 BASE-T console port is in link-up state
10/100 BASE-T console port is in link-down state or not connected
There are no blinking, red, or yellow states for this port
MGT
(rear)
Green
Off
10/100/1000BASE-T Management port is in link-up state
10/100/1000BASE-T Management port is in link-down state or not connected
There are no blinking, red, or yellow states for this port
Port
(front)
Green
Yellow
Flashing yellow
OffPort is operational
Port is disabled by user
Power-on self-test indicates faulty port
No signal detected or link configuration failureFan (front and rear)
Off
Green
RedNo power to the switch or fans (the tray may not be plugged in especially if one or more of the power supplies status LED is green)
Fan tray operational
Fault detectedPS1 and PS2
(front)
Off
Green
RedNo power to the PS
Operational1
Fault detected or the on/off switch is set to off while the power supply is plugged in
1 If either LED is green and the other is OFF the power supply is probably not plugged in. If it is red, the supply is either plugged in and not switched on or it is faulty. It may be necessary to interrogate the system for further status using the CLI.
Chassis Cooling
Note
The hot-swappable system fan tray provides cooling air for the internal chassis components. The fans exhaust air to the left, and fresh air is drawn in from the right side of the chassis.
Caution
Figure 1-7 shows the direction of airflow going in and out of the switch.
Figure 1-7 Catalyst 4900M Airflow
There are five fans in the fan tray. If an individual fan fails, the other fans continue to run. Sensors monitor the internal air temperatures. The number of fans in operation and their speed varies according to the internal temperature for the quietest operation possible. If the air temperature exceeds a desired threshold, the environmental monitor displays warning messages.
Power Supplies
Note
The Catalyst 4900M switch has two redundant internal 1000 W AC or 1000 W DC power supplies.
The internal power supplies have individual power cords and status LEDs (PS1 and PS2 on the front panel). There are also LEDs on the power supplies that show status for the input (Input OK) and output (Output OK) currents. A power cord is used to connect the power supplies to the site AC power source. There is a power switch on the AC Catalyst 4900M switch power supplies; AC power is present when a power cord is plugged into a power supply and the switch is set to the On position. DC power supplies do not use a power supply cord or have an on/off switch.
The switch starts with only one power supply plugged in, but redundant failover and load sharing is not available in this configuration. Cisco recommends that you always connect both power supplies to separate AC or DC circuits for optimal power reliability.
For safety reasons, the AC power supply must be switched off and unplugged before it is removed from a chassis or inserted into a chassis. DC supplies should have power shut off from the source before they are removed.
If only one power supply is used, you must use the blank faceplate supplied to cover the empty power bay.
Environmental Monitoring of the Power Supplies
Using the environmental monitoring and reporting functions, you can maintain normal system operation by resolving adverse environmental conditions prior to loss of operation.
Each power supply monitors its own temperature and output voltages. The Catalyst 4900M switch senses the operating condition of the power supply and reports status through software.
Power Management for the Catalyst 4900M Switch
You can select AC or DC power supplies for your switch. The Catalyst 4900M switch supports the following power supplies:
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A redundant power supply can be identified and diagnosed by a running system regardless of its input status. AC and DC supplies are interchangeable.
Power Management Modes
The Catalyst 4900M switch supports the redundant power management mode. In this mode, if both power supplies are operating normally, each provides from 20/80 to 45/55 percent of the total system power requirements at all times. If one power supply fails, the other unit increases power to 100 percent of the total power requirement.
Serial Number Location
Figure 1-8 shows the location of the serial number for your switch.
Figure 1-8 Catalyst 4900M Serial Number
