Cisco 2600XM Series Instalační příručka stáhnout pdf (Strana 12)

It may also be caused by faulty memory hardware or by a software bug.

Watchdog Timeouts

Cisco processors have timers that guard against certain types of system hangs. The CPU periodically resets a

watchdog timer. The watchdog timer basically controls the time of each process. If the timer is not reset, a

trap occurs. If a process is longer than it should be, the watchdog timer is used to escape from this process.

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

reported in one or both of these ways:

The show version command output shows:

"System returned to ROM by bus error at PC 0x602DADE0, address 0x480811"

− or −

"System returned to ROM by error − a Software forced crash, PC 0x60435894"

•

The console logs show:

%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:

Router uptime is 17 minutes

System returned to ROM by watchdog timer expired

System image file is "flash:c3640−is−mz.122−3.bin"

•

The console logs show:

System returned to ROM by watchdog timer expired

*** Watch Dog Timeout ***

PC = 0x800001b4, SP = 0x61e19590

•

Both of these are potential software issues and need further investigation based on their symptoms. Refer to

Troubleshooting Bus Error Crashes or Understanding Software−forced Crashes, depending on which one

appears in the show version output. For more information on Watchdog Timeout crashes, refer to

Troubleshooting Watchdog Timeouts.

Router Does Not Boot

Capturing information from the console of the router is essential for troubleshooting a router that does not

boot. The console output should be logged in a file for later analysis or for the Cisco Technical Assistance

Center (TAC) if a TAC case is opened. Compare the following symptoms and recommended actions to take if

you are encountering boot problems:

No LEDs on after powerup

Check whether the power cord is plugged in firmly and the power supply is good. If that does not resolve the

issue, replace the power cord. If the problem persists, replace the router.

Cisco − Hardware Troubleshooting for the Cisco 2600 Series Router

1 2 ... 7 8 9 10 11 12 13 14 15 16

Žádné komentáře

Cisco 2600XM Series Instalační příručka Strana 12