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Community Member

switch frequently reboot

my company has a cisco 4009 switch. this switch recently reboot serveral times. because other switch use the same power supply, but these swiths did't reboot. can you told me what was wrong and how to slove this problem

i put sh log result at here

6 REPLIES
Cisco Employee

Re: switch frequently reboot

Hi,

Could you attach the output of "show crashdump 1"

thanks,

Bobby

Community Member

Re: switch frequently reboot

here is the result of "show crashdump 1"

thank you

can you tell me how to read this result, i totally don't understand what it is

Re: switch frequently reboot

post show nvramenv as well.

Community Member

Re: switch frequently reboot

sh nvramenv 1

PS1="rommon ! >"

DiagBootMode="post"

?="0"

vitConsecTimeouts="2"

vitTimeouts="11"

MemorySize="64"

ResetCause="20"

AutobootStatus="success"

Re: switch frequently reboot

Teh crashdumps is invalid and not useful:

Version and date:

Old crashdump format or invalid Version and Date

The show nvramenv show the resetcause=20 which means a power cycle. check power source, power supply. try to plug the switch in secure room where no one can unplug it. and see it get anymore mysterious reboots.

Community Member

Re: switch frequently reboot

i will try it.

can you tell me where i find the document that can tell me how to read nvramenv and crashdump

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