Table Of Contents

Troubleshooting the Initial Hardware Configuration

Problem Solving

Troubleshooting the Power and Cooling Systems

Troubleshooting the Network Processor Modules and Cables

Environmental Reporting Features

Reading Front-Panel LED Indicators

System LED Operation

Reading Network Processor Module LED Indicators

Ethernet Network Processor Module LED Indicators

Token Ring Network Processor Module LED Indicators

Four Port Serial Module Indicators

Dual Serial Network Processor Module LED Indicators

FDDI Network Processor Module LED Indicators

BRI Network Processor Module LED Indicators

CT1 Network Processor Module LED Indicators

CE1 Network Processor Module LED Indicators

ATM Network Processor Module LED Indicators

Troubleshooting the Initial Hardware Configuration

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Your router went through extensive testing and burn-in before leaving the factory. However, if there are problems starting up your system, follow the steps in this chapter to help identify the cause.

Sections of this chapter follow:

•Problem Solving

•Environmental Reporting Features

•Reading Front-Panel LED Indicators

•Reading Network Processor Module LED Indicators

Use the information in this chapter to help isolate problems, or rule out the router as the problem source. If you cannot locate the source of your problem, contact a service representative for information on how to proceed in resolving the problem. Before you call, have the following information ready:

•Chassis type and serial number

•Maintenance agreement or warranty information

•Type of software and version number

•Date you received the new chassis

•Brief description of the problem you are having

•Brief explanation of what steps you have taken to isolate the problem

Problem Solving

The key to problem solving in this system is to try to isolate the problem to a specific subsystem. By comparing what the system is doing to what it should be doing, the task of isolating a problem is greatly simplified.

When problem solving, consider the following subsystems of the router:

•Power system—This subsystem includes the power supply and the wiring.

•Cooling system—The blower assembly should go on when power is applied.

•Network processor modules—Problems with these modules can be the most difficult to troubleshoot. The LEDs on the network processor modules can be used to help identify a failure. For complete information on LED indicators, refer to the section "Reading Front-Panel LED Indicators" later in this chapter.

•System cables—This subsystem includes all of the external cables that connect the router to the network.

Troubleshooting the Power and Cooling Systems

Check the following items to help isolate the problem:

•With the power switch on, does the blower operate?

•If yes, the AC input checks out.

•If no, suspect the AC input, AC source, router circuit breaker, or the power supply cable.

•With the power switch on and system LEDs lit, do the fans operate?

•If no, suspect the fans.

•Does the system shut down after being on a short time?

•Suspect an environmentally induced shutdown.

•Check the environmental site requirements in the section "General Site Requirements" in the chapter "Preparing for Installation" and ensure that the chassis intake and exhaust vents are clear.

•Suspect a power supply failure.

•System partially boots, but LEDs do not light.

•Suspect a 5-volt (V) power supply failure.

Troubleshooting the Network Processor Modules and Cables

Check for the following symptoms to help isolate the problem:

•Network processor module is not recognized by the system.

•Check the network processor module connection to the motherboard connector.

•Check the LEDs on the network processor module.

•Network processor module is recognized, but interface port(s) will not initialize.

•Check the motherboard connection.

•Check the external cables for connection.

•System will not boot properly or constantly/intermittently reboots.

•Check the network processor module connection to the motherboard.

•Suspect the processor or software.

•System boots, but console screen is frozen.

•Check the external console connection.

•Verify the console baud rate in the documentation for the terminal.

•System powers on and boots with a particular network processor module disconnected from the motherboard.

•Suspect the network processor module.

•System powers on and boots with a particular network processor module or cable disconnected.

•Suspect the network processor module or cable.

Environmental Reporting Features

If the router is operating at an abnormally high temperature, the following message will be transmitted to the console screen:

%SYS-1-OVERTEMP: System detected OVERTEMPERATURE condition. Please resolve cooling problem immediately!

Typical causes of abnormally high system temperature follow:

•Fan failure

•Air conditioner failure in the room

•Air blockage to cooling vents

Reading Front-Panel LED Indicators

The router's front panel has LED indicators for determining system performance and operation at a glance. The following sections contain information on reading the LED indicators.

System LED Operation

shows the network activity and health indicators and the run and power lights on the router front panel.

Figure 4-1 Cisco 4000 Series—Front Panel Indicators

From left to right, when facing the chassis front, the three lower LEDs on the left correspond in position to the three network processor modules, if present, and represent their status. The upper LEDs, when blinking, indicate network activity on their respective interfaces.

When on, the bottom LED on the far right indicates that the system card's power is on, and the top LED on the far right indicates that the processor is working.

Reading Network Processor Module LED Indicators

The network processor module LEDs are all visible through cutouts in the rear of the chassis.

Ethernet Network Processor Module LED Indicators

When facing the rear of the chassis, the LEDs on the dual-port Ethernet network processor module are labeled as shown in . (Also see Figure 2-9.)

Figure 4-2 Dual-Port Ethernet Network Processor Module LEDs

When facing the rear of the chassis, the LEDs on the single-port Ethernet network processor module are labeled as shown in . (Also see Figure 2-5.)

Figure 4-3 Single-Port Ethernet Network Processor Module LEDs

Descriptions of the Ethernet LED indicators follow:

•AUI—When lit, this indicates the AUI connection is selected. Use the media command to configure your selection of 10BaseT or AUI. The syntax of the media command follows:

media-type aui | 10BaseT

Details on the media command are in the appropriate IOS software publication.

When AUI is selected, none of the other LEDs on the network processor module will be lit. The other LEDs are meaningful only when you use 10BaseT, and you have a link.

•POL (polarity)—When lit, this indicates the autopolarity reading detected the polarity was defective and corrected for it (switched it).

•LNK (link)—When lit, this indicates 10BaseT is selected, and the link is available.

•RX (receive)—When lit, this indicates the system is receiving data from the line.

•TX (transmit)—When lit, this indicates the system is sending Ethernet transmissions.

Token Ring Network Processor Module LED Indicators

The two LEDs in the Token Ring network processor module are labeled 16M and IN-RING. (See .)

Figure 4-4 Token Ring Module Network Connector

The left LED (16M) indicates ring speed. When lit, it indicates a ring speed of 16 Mbps; when not lit, it indicates a ring speed of 4 Mbps.

The right LED (In-Ring), when lit, indicates that the network processor module is inserted into the ring. If it is not lit, the network processor module is not inserted into the ring.

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Timesaver   

When the right LED is off, you can unplug the Token Ring cable without causing a problem on the ring.

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Four Port Serial Module Indicators

The four port serial network processor module has six LEDs per port. (See and .) LED Indicators and colors are explained in . The four port serial LEDs functions are different from the dual serial module's functions.

Figure 4-5 Four-Port Serial Network Processor Module Ports

Figure 4-6 G.703/G.704 Serial Network Processor Module Ports (DB-15)

Table 4-1 Four Port Serial Network Processor Module LED Indicators

LED Labels and Colors	Indication
LP (yellow)	Loop
CN (green)	Connect (DSR, DTR, DCD, RTS, CTS)
TD (green)	Transmit data
TC (green)	Transmit clock
RD (green)	Receive data
RC (green)	Receive clock

TC, RC, TD, and RD are on only when the associated line is changing state; if a line is stuck high or low, the LED is off.

The names of the LEDs are given according to standard serial interface naming conventions. For example, TD (transmit data) is always associated with the data that is driven by the DTE regardless of whether the port on the four port serial module is a DTE or a DCE. This means that TD reflects output data when the port is a DTE and input data when the port is a DCE. RD (receive data) is controlled in a similar way. TC (transmit clock) and RC (receive clock) are always associated with the clocks that are driven by the DCE: outputs for a DCE port and inputs for a DTE.

Dual Serial Network Processor Module LED Indicators

The dual serial network processor module has two LED cards. As viewed from the front (see ), the left card is marked P-0 (for port 0), and the right card is marked P-1 (for port 1). The lower serial port is port 0, and the upper serial port is port 1, as shown on the labels. There are 10 LEDs per port. System network processor modules can be configured for either DTE or DCE.

Figure 4-7 Serial Port Labeled V2

shows the top view of the dual serial network processor module. Note the locations of the LED daughter cards and the ports that they indicate.

Figure 4-8 Dual Serial Network Processor Module—Top View

When DCE cables are used and when the port is configured in software with the clockrate command as a DCE port, the bottom LED will light. (See .) (For a further explanation of the clockrate command, see the appropriate Cisco IOS software publication.)

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Note   An error message will be generated if there is a mismatch between the cable and the software configuration of the port—for example, if the cable is DTE and the clock rate is set, or if the cable is DCE and the clock rate is not configured.

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shows the dual serial port network processor module LED card.

Figure 4-9 Dual Serial Port LED Card—Side View

The convention used here to indicate corresponding signals for DTE/DCE is to list DTE first. For example, shows the top LED, D0, indicates TXD in DTE mode or RXD in DCE mode.

The dual serial port network processor module LED Indicators are explained in .

Table 4-2 Dual Serial Network Processor Module LED Indicators

Serial LED Card Outer Labels	Indication (DTE/DCE)
DO	Data Out (TXD/RXD)
TXC	Transmit Clock
DI	Data In (RXD/TXD)
RXC	Receive Clock
DCD	Data Carrier Detect
RS	Receive Signaling
TS1	Transmit Signaling
TS2	Transmit Signaling
LP	Loop
DCE	Lit if network processor module is DCE

FDDI Network Processor Module LED Indicators

Dual-attachment FDDI network processor modules have one LED per port, located adjacent to the corresponding port on the module panel (see and ), while single-attachment modules have one LED, located adjacent to the single port on the module panel. (See .)

Figure 4-10 Dual-Attachment Single-Mode FDDI Module—End View

Figure 4-11 Dual-Attachment Multimode FDDI Module—End View

Figure 4-12 Single-Attachment Multimode FDDI Module—End View

When lit, a module LED indicates a ring up condition. Dual-attachment FDDI module LEDs indicate which PHY on the network processor module is inserted into the ring; if a PHY is not actively inserted into the ring, the LED is not lit. On a single-attachment module, the LED indicates ring up when lit; when the LED is not lit, it indicates that the module is not inserted into a ring.

BRI Network Processor Module LED Indicators

When on, the multiport BRI network processor module status LEDs indicate a Layer 1 connection on the corresponding port. When off, the LEDs indicate that the link is not established on the corresponding port.

Figure 4-13 Eight-Port BRI Network Processor Module

Figure 4-14 Four-Port BRI Network Processor Module

CT1 Network Processor Module LED Indicators

The three LEDs on the CT1 network processor module are labeled loopback, local alarm, and remote alarm. (See .)

Figure 4-15 Channelized T1 Network Interface Processor

The three LEDs on the CT1 front panel indicate the following:

•Loopback—Indicates controller local loopback.

•Local alarm—Indicates a loss of signal, a loss of frame, or unavailability because of excessive errors.

•Remote alarm—Indicates a remote alarm is received from the remote end because of a local alarm at the remote end.

CE1 Network Processor Module LED Indicators

The three LEDs on the CE1 network processor module are labeled loopback, local alarm, and remote alarm. (See .)

Figure 4-16 Channelized E1 Network Interface Processor

The three LEDs on the CE1 front panel indicate the following:

•Local alarm—Indicates a loss of signal, a loss of frame, or unavailability because of excessive errors.

•Remote alarm—Indicates a remote alarm is received from the remote end because of a local alarm at the remote end.

•Loop—Indicates controller local loopback.

ATM Network Processor Module LED Indicators

The three LEDs on the ATM network processor module are labeled loopback, local alarm, and remote alarm. (See and .)

Figure 4-17 ATM Network Processor Module with STS-3c/STM-1 Single Mode PLIM

Figure 4-18 ATM Network Processor Module with STS-3c/STM-1 Multimode PLIM

Four LEDs on the ATM front panel indicate the following:

•Busy—Not applicable in normal use

•Ready—When lit, configuration is complete and the module is ready for use

•Rx Cells—The module is receiving traffic (cells)

•Rx Alarm—Error condition: loss of signal or remote alarm