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Cisco - Hardware Troubleshooting for Cisco 1700 Series Routers

There are two main types of watchdog timeouts. The first type is usually caused by a software problem

and is reported in the router console logs as:

%SYS-2-WATCHDOG: Process aborted on watchdog timeout

The second type of watchdog timeout is usually due to a hardware problem and is reported in one or

both of these two ways:

The show version command output shows:

System returned to ROM by watchdog timer expired

The console logs show:

*** Watch Dog Timeout ***

Refer to

Troubleshooting Watchdog Timeouts

Router Is Dropping Packets

Packet losses caused by hardware problems are fairly easy to identify. The following section uses the

output of the show interfaces command to identify packet losses.

Cyclic Redundancy Check (CRC) and Frame Errors

If CRC errors or frame errors are constantly increasing on the interface, this usually indicates a hardware

problem.

router#show interface ethernet 0

Ethernet0/0 is up, line protocol is up

...

121 input errors, 102 CRC, 19 frame, 0 overrun, 0 ignored

An exception to this is when CRC and frame errors are found on channelized interfaces; they can

indicate clocking problems as well. The fault that is causing the errors can be anywhere between two

connected interfaces: on cables, intermediate devices, or on interfaces themselves. Troubleshooting

techniques differ slightly for different interface types.

Ethernet Interfaces

For Ethernet interfaces, troubleshooting differs between a shared environment (devices connected

through a hub or with a coaxial cable) and a switched environment (devices connected to a switch).

In a switched environment, there are only three components that could cause the error:

cable

local interface (port)

remote interface (port)

http://kbase:8000/paws/servlet/ViewFile/17959/hwts_1700_17959.xml?convertPaths=1

to further troubleshoot this issue.

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01/10/2004