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Nicolas Maton
Beginner

catalyst 3750 high cpu (spanning-tree) even after disabling spanning tree

Hi,

 

I'm looking for an explenation.

I have disabled spanning-tree on my stacked catalyst 3750's. 

 

switch#sh spanning-tree

 

No spanning tree instance exists.

 

 

However the spanning tree process still remains at 30+%.. some moments the switch goes to 80%+

 

switch#show processes cpu sorted | exc 0.00

CPU utilization for five seconds: 51%/4%; one minute: 53%; five minutes: 58%

 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process 

 220  26998131352225719811          0 32.53% 32.19% 32.58%   0 Spanning Tree    

   9  18731538913567807945          0  3.66%  3.43%  3.94%   0 ARP Input        

 167  2252711720  65652703      34313  3.50%  3.16%  3.13%   0 PI MATM Aging Pr 

 145   4523379461399674340        323  1.11%  1.13%  1.08%   0 Hulc LED Process 

 106   204130136  98476206       2072  0.47%  0.30%  0.28%   0 hpm counter proc 

  41    90142651  15430079       5842  0.15%  0.15%  0.15%   0 Compute load avg 

  44    27196496  18587099       1463  0.15%  0.04%  0.05%   0 HC Counter Timer 

  35    44370625  66207940        670  0.15%  0.08%  0.06%   0 Per-Second Jobs  

  72    29120406 110630763        263  0.15%  0.03%  0.03%   0 hrpc <- response 

 155   106052423  54633914       1941  0.15%  0.16%  0.15%   0 HRPC qos request 

 200   522703385 549493508        951  0.15%  1.08%  1.04%   0 CDP Protocol     

  81    28065178 108474059        258  0.15%  0.08%  0.07%   0 HRPC hlfm reques 

 

 

 

 

Anyone has an idea why this is? 

 

 

Thanks ! 

4 REPLIES 4
Reza Sharifi
Hall of Fame Expert

Hi,

What version of IOS are you running?

 

HI, 

 

 

ROM: Bootstrap program is C3750 boot loader

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

 

Cisco_Switch_DC uptime is 2 years, 9 weeks, 4 days, 16 hours, 51 minutes

System returned to ROM by power-on

System restarted at 21:49:45 CET Tue Nov 20 2012

System image file is "flash:/c3750-ipservicesk9-mz.122-55.SE5.bin"

Upgrade to 12.2(55)SE9.  The version you're running is not yet stable.

danibqb01
Beginner

Hello guys,

 

I'm having this same problem, STP is disabled, but the spanning tree process consumes about 18% of the CPU.

 

IOS run: version 15.2 (4) E8.

 

------------------ show running-config ------------------

!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
no spanning-tree vlan 1-4094
!

------------------ show spanning-tree ------------------

 

No spanning tree instance exists.

 

Would anyone have any ideas?