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Understanding High CPU on 3750X 48

joshhboss
Beginner
Beginner

I have about 25 Aps connected to this switch and I was just trying to understand why I have high CPU and if the processes below are indicative of something that might be wrong with the switch or the config. There some traffic going through but nothing wild. only 100 megs out of the 10gig uplink.

 

Sw101(config-if-range)#do sh proc cpu sort | e 0.0
CPU utilization for five seconds: 86%/3%; one minute: 62%; five minutes: 62%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process 
 273     3854942      163338      23601 13.19%  5.71%  6.59%   0 VMATM Callback   
   4     8159446      349214      23365 11.60%  3.25%  2.51%   0 Check heaps      
 248    17716257     8600263       2059 10.33%  6.56%  7.15%   0 Spanning Tree    
  87    10252043     5578356       1837  4.45%  3.26%  3.27%   0 RedEarth I2C dri 
 109        2466         737       3345  3.81%  1.32%  0.58%   1 SSH Process      
 264      600463      110692       5424  1.74%  0.80%  0.87%   0 SpanTree Flush   
 134     3748387      330344      11346  1.58%  1.21%  1.16%   0 hpm counter proc 
 124      977796     7998718        122  1.27%  0.80%  0.94%   0 HLFM address lea 
 258     2131896     2764169        771  0.95%  1.22%  1.49%   0 HULC DAI Process 
 130     1066571     5530061        192  0.63%  0.45%  0.40%   0 hpm main process 
 198     1475813       65705      22461  0.47%  0.44%  0.45%   0 HQM Stack Proces 
  59      346455      330434       1048  0.31%  0.13%  0.12%   0 Per-Second Jobs  
 230      276024     4822450         57  0.15%  0.12%  0.10%   0 VRRS Main thread 
 341      375218      719640        521  0.15%  0.16%  0.15%   0 Marvell wk-a Pow 
 171      622284     1606895        387  0.15%  0.21%  0.21%   0 Hulc Storm Contr 
  89      547401     2649445        206  0.15%  0.16%  0.16%   0 RedEarth Rx Mana 
 217      315660      245044       1288  0.15%  0.11%  0.10%   0 CDP Protocol

 

 

 

Sw101(config-if-range)#do sh proc cpu sort | e 0.0
CPU utilization for five seconds: 77%/2%; one minute: 59%; five minutes: 62%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process 
 182    71439099     8180328       8733 19.51% 19.97% 19.93%   0 Hulc LED Process 
   4     8165459      349466      23365 17.11%  2.80%  2.36%   0 Check heaps      
 248    17737127     8605509       2061  8.15%  6.88%  7.14%   0 Spanning Tree    
  88    19106810     3493345       5469  7.51%  6.22%  6.10%   0 RedEarth Tx Mana 
  87    10259852     5582863       1837  4.31%  2.87%  3.04%   0 RedEarth I2C dri 
 273     3874886      164126      23609  2.39%  4.97%  6.76%   0 VMATM Callback   
 258     2136696     2768299        771  1.91%  1.44%  1.57%   0 HULC DAI Process 
 109        3159        1033       3058  1.75%  0.36%  0.38%   1 SSH Process      
 134     3751400      330595      11347  0.79%  1.10%  1.13%   0 hpm counter proc 
 130     1067578     5533513        192  0.63%  0.35%  0.37%   0 hpm main process 
 447      433074      620915        697  0.63%  0.18%  0.14%   0 LLDP Protocol    
 269      544066      971445        560  0.47%  0.52%  0.48%   0 IP Host Track Pr 
 198     1477017       65755      22462  0.47%  0.43%  0.46%   0 HQM Stack Proces 
 124      980520     8004319        122  0.47%  0.78%  0.94%   0 HLFM address lea 
 461      340112      812609        418  0.31%  0.13%  0.12%   0 IP SNMP          
  89      547854     2651591        206  0.31%  0.12%  0.15%   0 RedEarth Rx Mana 
 264      603139      111179       5424  0.15%  0.73%  0.91%   0 SpanTree Flush   
  59      346852      330684       1048  0.15%  0.14%  0.13%   0 Per-Second Jobs  
 217      315947      245217       1288  0.15%  0.10%  0.10%   0 CDP Protocol 

 

oh and btw -- * 1 54 WS-C3750X-48P 15.2(4)E10 C3750E-UNIVERSALK9-M 

6 Replies 6

MHM Cisco World
Advisor
Advisor

1-If you run L2 roaming between AP, then MAC address is move and this make CPU high utilize.
2-check this bug 
https://quickview.cloudapps.cisco.com/quickview/bug/CSCtn42790

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

@joshhboss wrote:
 182    71439099     8180328       8733 19.51% 19.97% 19.93%   0 Hulc LED Process

HULC and RedEarth are related to STP. 

Are there any ports that are flapping continuously?

No not really.. honestly everything seems to be working but its just such high utilization. I have about 17 unused ports and they are all shutdown. since shutting them down it looks like switched has idle more on 50%

Hello,

shutting down unused ports is a very good idea and usually helps bringing CPU utilization down. That said, a utilization of around 50 percent is normal for these switches.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

@joshhboss wrote:

since shutting them down it looks like switched has idle more on 50%


<65% for a 3750X is fine.

MHM Cisco World
Advisor
Advisor

show mac-address-table notification mac-move <- check this command see if there is many MAC move

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