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New Member

Catalyst 2960S problem

Hi,

I have 4 Catalyst 2960S, and they have the same problem.

The CPU usage is 60% before I telnet them.

It fell to 20% when I using telnet to login. And raised to above 60% after logout.

2010-06-18_095534.png

This is the output of 'show proc cpu' when I login.

2010-06-18_100251.png

This is the output of 'show proc cpu' 2 mins later.

2010-06-18_100804.png

And the traffic chart will like this.

2010-06-18_102131.png

How can I to solve this problem?

The hardware & software version is:

WS-C2960S-48TS-L   12.2(53)SE1           C2960S-UNIVERSALK9-M

Many thanks for any comments.

Everyone's tags (3)
49 REPLIES

Re: Catalyst 2960S problem

Hi,

I have 4 Catalyst 2960S, and they have the same problem.

The CPU usage is 60% before I telnet them.

It fell to 20% when I using telnet to login. And raised to above 60% after logout.

This is the output of 'show proc cpu' when I login.

This is the output of 'show proc cpu' 2 mins later.

And the traffic chart will like this.

How can I to solve this problem?

The hardware & software version is:

WS-C2960S-48TS-L   12.2(53)SE1           C2960S-UNIVERSALK9-M

Many thanks for any comments.

Hi,

Check out the below link for troubleshooting high cpu in cisco 2960 switches hope to help !!

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html

Ganesh.H

New Member

Re: Catalyst 2960S problem

Hi, Genash,

Thanks for your response.

But there is no matched conditions in our 2960S.

I have four 2960S and six 2960G on the same rack and connected to the same 3750-stack.

They have the same configuration.

But only 2960S got this problem.

Allen Huang

Cisco Employee

Re: Catalyst 2960S problem

s

New Member

If you are running rancid,

If you are running rancid, disable it. it cause high ssh process time on 2960

Hall of Fame Super Gold

Re: Catalyst 2960S problem

WS-C2960S-48TS-L   12.2(53)SE1

Try 12.2(53)SE2.

New Member

Re: Catalyst 2960S problem

Hi, leolaohoo,

Thanks for your response.

After upgrade one of them to 12.2(53)SE2.

Still the same situation.

CPU usage raised to 60% after boot completed.

It fell to 20% when I using telnet to login switch.

And raised back to 60% after logout.

Cisco Employee

Re: Catalyst 2960S problem

Allen,

Can you get "show proc cpu | e  0.00" and "show controller cpu-int" (couple of times) from the switch  when it is running high cpu.

Thanks.

JayaKrishna

Cisco Employee

Re: Catalyst 2960S problem

What happens when you console in to the switch.Does the cpu remain high? If yes then get show proc cpu | ex 0.00

New Member

Re: Catalyst 2960S problem

Just going to throw this out here but if all of his switches are displaying the same symptom, high CPU usage, and that they are all connected to the 3750 stack, perhaps he's running some sort of process, STP, routing protocols, that are misconfigured and causing the high CPU usage.

Cisco Employee

Re: Catalyst 2960S problem

You might want to check this CSCth24278

Re: Catalyst 2960S problem

We were seeing the same problem on our 2960s, and CSCth24278 was the culprit.  Cisco says it's a cosmetic bug that doesn't affect switch operations, though I have my doubts (we're seeing some performance problems that I suspect are high CPU related).  No fix yet -- eta March 2011!

Hall of Fame Super Gold

Re: Catalyst 2960S problem

I'm currently running 12.5(55)SE on the 2960S.  I'm testing the same code on the 3750/3750E/3750X and so far so good.

Re: Catalyst 2960S problem

Do you mean it fixed the high CPU?  Cisco TAC told me that high CPU (CSCth24278) was NOT fixed in 12.5(55)SE, but would be fixed in a release coming in 2011.

Bronze

Re: Catalyst 2960S problem

CSCth24728 (http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCth24278) is a cosmetic issue. It will be fixed in 12.2(58)SE

If this is impacting performance, then it is probably a different issue.

Re: Catalyst 2960S problem

I know bug CSCth24278 is listed as cosmetic, but I think that may be wrong.  When we have high CPU, we are seeing packet loss on the switch.  We then connect a telnet session, CPU lowers, and packet loss stops.  Disconnect the telnet session, packet loss resumes.

We have a TAC case open documenting all of this.

New Member

Re: Catalyst 2960S problem

We are experiencing the same problem and 12.5(55)SE does not fix the cpu bug.

Re: Catalyst 2960S problem

Thanks for the info, that'll save me some work

New Member

Re: Catalyst 2960S problem

We are having the same Problem too.

#show processes cpu history



    2223222222228222222223222369666666666666669666666666666696
    8897787757889775899890865119130333135431413133253322443111
100                            *
90             *              *              *             *
80             *              *              *             *
70             *              *        *     *    *        *
60             *             *###############################
50             *             *###############################
40    *        *             *###############################
30 ************#*************################################
20 ##########################################################
10 ##########################################################
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

    9999999999999999999999999999999999999999999999999999999999999999999999
    9998999899699999998889989889899899999899899999999998999999999999988798
100 **********************************************************************
90 **********************************************************************
80 **********************************************************************
70 **********************************************************************
60 *################*********#########################################***
50 ##################*******###########################################**
40 ##################*******###########################################**
30 ###################******###########################################**
20 ######################################################################
10 ######################################################################
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%

Where you can see the gaps i was logged in via ssh.

There are serious Performance Problems in our network.

I found some strange outputs:

If i enter show platform port-asic stats drop

Port-asic Port Drop Statistics - Summary
========================================
  Port  0 TxQueue Drop Stats: 0
  Port  1 TxQueue Drop Stats: 121840
  Port  2 TxQueue Drop Stats: 0
  Port  3 TxQueue Drop Stats: 239
  Port  4 TxQueue Drop Stats: 0
  Port  5 TxQueue Drop Stats: 8174
  Port  6 TxQueue Drop Stats: 17
  Port  7 TxQueue Drop Stats: 197598
  Port  8 TxQueue Drop Stats: 0
  Port  9 TxQueue Drop Stats: 0
  Port 10 TxQueue Drop Stats: 0
  Port 11 TxQueue Drop Stats: 0
  Port 12 TxQueue Drop Stats: 0
  Port 13 TxQueue Drop Stats: 0
  Port 14 TxQueue Drop Stats: 0
  Port 15 TxQueue Drop Stats: 16
  Port 16 TxQueue Drop Stats: 0
  Port 17 TxQueue Drop Stats: 16
  Port 18 TxQueue Drop Stats: 0
  Port 19 TxQueue Drop Stats: 679
  Port 20 TxQueue Drop Stats: 242
  Port 21 TxQueue Drop Stats: 0
  Port 22 TxQueue Drop Stats: 359
  Port 23 TxQueue Drop Stats: 0
  Port 24 TxQueue Drop Stats: 16
  Port 25 TxQueue Drop Stats: 0
  Port 26 TxQueue Drop Stats: 0
  Port 27 TxQueue Drop Stats: 0

I don't think, that this dropping is normal. I will continue trying to solve the Problem.

Greetings,

Benjamin

New Member

Re: Catalyst 2960S problem

This is what one of our switches reports after we just ha

ve telented into it. The CPU drops to a normal level just after we telnet to it.

         11111555555555555555555555555555555555555555555555555
    6666622222000003333322222111112222211111444443333311111777
100                                                          
90                                                          
80                                                          
70                                                          
60                                                        ***
50           ************************************************
40           ************************************************
30           ************************************************
20           ************************************************
10 **********************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5   
               CPU% per second (last 60 seconds)
                                                             
    5555555555555555555555555555555555555555555555555555555555
    7667778587475557888685766865576765556757765565776566677465
100                                                          
90                                                          
80                                                          
70                                                          
60 ********** ******************************************** **
50 ##########################################################
40 ##########################################################
30 ##########################################################
20 ##########################################################
10 ##########################################################
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5   
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%
                                                                         
    5555655566655565555555555655655655565665565565656666556555556555556655
    9989199900099909988989998098099088909009919909090100990899990999980099
100                                                                      
90                                                                      
80                                                                      
70                                                                      
60 **********************************************************************
50 ######################################################################
40 ######################################################################
30 ######################################################################
20 ######################################################################
10 ######################################################################
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)

New Member

Re: Catalyst 2960S problem

I have the same problem

stack group as follow:

switch 1 provision ws-c2960s-48lps-l

switch 2 provision ws-c2960s-48ts-l

switch 3 provision ws-c2960s-48ts-l

switch 4 provision ws-c2960s-48ts-l

c2960s-universalk9-mz.122-53.SE2
when i ssh into the stack the CPU utilization drops and stay down for the duration of the session, once I log out the CPU go's up again.
New Member

Re: Catalyst 2960S problem

Same problem here !

I'm happy I've found people with the same problem since I've already post regarding this issue :

At first, I thought I had a problem with my trunking settings (I'm not a Cisco expert) : https://supportforums.cisco.com/thread/2025472 then

https://supportforums.cisco.com/message/3222651

We did a waranty RMA since I thought the switch was faulty!

New Member

Re: Catalyst 2960S problem

Hi,

We have the same problem.

High CPU (80%) and packet loss. We then connect a telnet session, CPU lowers, and packet loss stops.  Disconnect the telnet session, packet loss resumes.

Any news about software release 12.2.58 ??

/Magnus

Re: Catalyst 2960S problem

Hey Magnus -- two questions...

What IOS are you currently at?

How long have your switches been up?

The high CPU bug is still waiting for 12.2(58).  But there's another bug CSCtg77276 which affects 12.2(53) after 6 weeks of uptime.  Although the public case notes on CSCtg77276 don't exactly mention it, my Cisco engineer informs me it could cause packet loss. Upgrading to 12.2(55) fixed our packet loss problem -- but the high CPU bug is still there.

Tom

New Member

Re: Catalyst 2960S problem

Hi Tom,

Thanks for your response and information about the bug CSCtg77276.

Have you any information when 12.2(58) arrives?

The version is 12.2(53)SE2 and uptime is 5 weeks, 6 days, 8 hours, 29 minutes.

Best Regards

/Magnus

Re: Catalyst 2960S problem

Unofficially from my TAC engineer I heard 12.2(58) will be early 2011.  But given your problem (packet loss) and your uptime, I would give 12.2(55) a try.  It won't fix your high CPU, but it may fix your packet loss.

Tom

New Member

Re: Catalyst 2960S problem

Thanks!!

Have a nice day!

Best Regards

/Magnus

Cisco Employee

Re: Catalyst 2960S problem

Hi Allan,

This is happening due to a cosmetic software defect, where you will observe the CPU load more than 50 - 60% on these switches when you do not access them however it immediately normalizes when you access it via console; telnet or SSH. This is purely cosmetic and does not hamper the network and services running on the device.

Please check the following Bug: CSCth24278 - High CPU when no Console/VTY activity, or more info about it.

Regards,

Vishal

New Member

Re: Catalyst 2960S problem

Hi, Vishal,

Thanks for your reply. But even this issue is cosmetic.

It still hard to explain to my boss.

Could you help to push RD to correct this issue ASAP?

I think it would be quite easy if it's not a problem.

Thanks.

Cisco Employee

Re: Catalyst 2960S problem

Hi Allan,

You can leave a PC connected on it via console, this will not let the CPU go high and even if you face the issue than it could happen due to some other triggers taking place in the network and not becuase of High CPU.

I hope this way you can give an explanation to your Boss.

Kindly note that the respective team is working on it and you will be notified as soon as some information goes public about it.

Regards,

Vishal

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