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Chapter 4
Cisco's Diagnostic Commands
show stacks
The show stacks command is not very useful to you, but it is invaluable infor-
mation for the Cisco TAC. The output from the command appears below. As
you can see, it doesn't make a lot of sense to the user. The information is sent to
Cisco; Cisco runs it through a stack decode that provides the information rele-
vant to system problems.
Stacks are used to provide information on the router's processes and pro-
cessor utilization. The output displayed is from a healthy router. If the router
were to crash, the latest stack information is saved so it can be captured once
the router comes back up. The data contains information regarding the rea-
son for the reload and any errors that are attributed to the crash.
Router_A#show stack
Minimum process stacks:
Free/Size Name
10288/12000 Init
5196/6000 Router Init
9672/12000 Virtual Exec
Interrupt level stacks:
Level Called Unused/Size Name
1 49917 8200/9000 Network Interrupt
2 2 8372/9000 Network Status Interrupt
3 0 9000/9000 OIR interrupt
4 0 9000/9000 PCMCIA Interrupt
5 2561 8652/9000 Console Uart
6 0 9000/9000 Error Interrupt
7 27140712 8608/9000 NMI Interrupt Handler
Router_A#
show tech-support
The tech-support command is a compilation of several show commands
(version, running-config, controllers, stacks, interfaces, diagbus,
buffers
, process memory, process cpu, context, boot, flash bootflash,
ip traffic
, and controllers cbus). You can get most of the information you
need by issuing the show tech-support command, instead of issuing all of the
commands separately.
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