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Switch is restarting from time to time

dears,

I noticed one of my 2950 both switches is restarting from time to time, the both are performing purely as layer 2, vlans are configured on both switches and propagated through the trunk ports, the switches are both in transparent mode. one of them is usually resarting after each 5 to 7 hours, when i issue the (sh logg) command on the switch the output as follows:

00:00:17: %SYS-5-CONFIG_I: Configured from memory by console

00:00:18: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively do

wn

00:00:18: %SYS-5-RESTART: System restarted --

Cisco Internetwork Operating System Software.

Is it because of loops?? spantree is enabled on it?

why is this happening??

I appreciate your feedback,

thanks,

8 REPLIES

Re: Switch is restarting from time to time

Hi Friend,

STP loop alone should not lead to restart of switch especially in small network. IF STP is enabled on first place there will be no loop till the time you have played with mis configuration and bad design which i do not think you have as per your explaination.

Can you post the complete sh version which may give an idea of restart reason.

Also check for sh proc cpu if any process is hitting a high cpu?

Regards,

Ankur

Re: Switch is restarting from time to time

Ankur,

Thank u for your input, the cpu utilization is hitting maximum 5 to 6%, there is no high utilization on it.

The out put from the (sh ver) command as follows:-

Switch-2#sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(6)EA2c, RELEASE SOFTWARE

(fc1)

Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Thu 28-Feb-02 14:44 by antonino

Image text-base: 0x80010000, data-base: 0x8042C000

ROM: Bootstrap program is CALHOUN boot loader

Switch-2 uptime is 3 hours, 21 minutes

System returned to ROM by power-on

System image file is "flash:c2950-i6q4l2-mz.121-6.EA2c.bin"

cisco WS-C2950-24 (RC32300) processor (revision C0) with 21295K bytes of memory.

Processor board ID FOCX0711Z172

Last reset from system-reset

Running Standard Image

24 FastEthernet/IEEE 802.3 interface(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:0D:28:BF:DE:40

Motherboard assembly number: 73-5781-10

Power supply part number: 34-0965-01

Motherboard serial number: FOC07291RD9

Power supply serial number: PHI0146WATO

Model revision number: C0

Motherboard revision number: A0

Model number: WS-C2950-24

System serial number: FOCX0711Z172

Configuration register is 0xF

Let me know your feedback,

thanks in advance,

Re: Switch is restarting from time to time

Hi Friend,

What I can think of is either the system was power-cycled, or the power source went down for a few seconds. Can you check your power outlet for this switch?

Regards,

Ankur

Cisco Employee

Re: Switch is restarting from time to time

Hi,

Was there a stack trace logged when the switch reset? Could you post the output of "show stacks?"

thanks,

Bobby

Re: Switch is restarting from time to time

Hi Bobby,

Sorry for the delay reply, I have been away for some 2 days.

Anyways, bellow are the output for (sh stacks):-

Switch-2#sh stacks

Minimum process stacks:

Free/Size Name

4924/6000 calhoun_flash init

5592/6000 SPAN Subsystem

5584/6000 platform SPAN Subsystem

9504/12000 Init

5308/6000 RADIUS INITCONFIG

8116/9000 DHCP Client

Interrupt level stacks:

Level Called Unused/Size Name

3 12351827 7872/9000 StrataSwitch

4 342148 8712/9000 EIC intr

7 30378550 8748/9000 Timer Interrupt Handler

Any Ideas!!

Thanks,

Re: Switch is restarting from time to time

Hi All,

Any updates would be highly Appreciated,

Thanks,

Re: Switch is restarting from time to time

Guys,

This issue puzzled me enough, please if u have any comments let me know, it's restarting a gain,

find bellow the output of (sh stacks):-

Switch-2#sh stacks

Minimum process stacks:

Free/Size Name

4924/6000 calhoun_flash init

5592/6000 SPAN Subsystem

5584/6000 platform SPAN Subsystem

9504/12000 Init

5308/6000 RADIUS INITCONFIG

8112/9000 DHCP Client

Interrupt level stacks:

Level Called Unused/Size Name

3 7994 7872/9000 StrataSwitch

4 2090 8712/9000 EIC intr

7 23233 8748/9000 Timer Interrupt Handler

Spurious interrupts: 1

And find bellow the output from (sh logg):-

Log Buffer (4096 bytes):

0Log Buffer (4096 bytes):

00:00:17: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively do

wn

00:00:17: %SYS-5-CONFIG_I: Configured from memory by console

00:00:18: %SYS-5-RESTART: System restarted --

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(6)EA2c, RELEASE SOFTWARE

(fc1)

Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Thu 28-Feb-02 14:44 by antonino

00:00:18: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state t

o down

00:00:20: %LINK-3-UPDOWN: Interface FastEthernet0/19, changed state to up

00:00:21: %LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to up

00:00:21: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to up

00:00:21: %LINK-3-UPDOWN: Interface FastEthernet0/4, changed state to up

00:00:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/19, chan

ged state to down

00:00:21: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

00:00:21: %DTP-5-TRUNKPORTON: Port Fa0/19 has become dot1q trunk

00:00:22: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, chang

ed state to down

Any help would be appreciated,

Thanks,

Re: Switch is restarting from time to time

Hi Friend,

I got some information from the cisco output interpreter using the stack information which you posted.

Have a look at this

This device has reported 1 spurious interrupts. These interrupts occur

when an unnecessary interrupt is raised for an already processed packet, possibly

due to an internal race condition, or due to improper initialization of interrupt

handling routines. These may be caused either by defective hardware, or by software.

There is no discernable impact on the behavior of the router due to such spurious

interrupts. They are only counted for monitoring purposes. They may safely be ignored

as long as the number of spurious interrupts is not high and increasing, along

with some dropped packets or degraded performance.

For more information on spurious interrupts

http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1828/products_tech_note09186a00800a65d1.shtml

HTH, if yes please rate the post.

Ankur

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