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Highlighted
Beginner

High CPU throughout entire network

We've been seeing an issue for some time now where our switches show spikes close to 98-99% throughout the day on their CPU's. This behavior shows in the distribution switches and the access switches, at all hours of the day, all days of the week, but at varying times. When we start to investigate with a sho proc cpu history, we get the outputs below (typically). As you can see, the one minute views and 5 minute views NEVER show much of anything, but the last 72 hour view shows what I would consider to be a huge problem (although the averages are very low overall). If I sit in the switch and continously up-arrow to refresh this, it never really changes. Same for the sho proc cpu sorted (also below).

Models affected include 6509-E's with Sup720-10G, 4510's, 3560E, 3750X, 2960S, 2960G, 3560G, 3750G, 4948 10G. Pretty much every switch in the environment. We do run a fair amount of VLANs within the network (around 150). I'm not sure if we're seeing Spanning Tree issues or some other problem (we do prune our vlans). We get sporadic complaints from users about random disconnects from the switch at different times of day, and reports of sluggishness on the network (no log events or unusual behavior in our Solarwinds monitoring to indicate an issue).

Any ideas on where else to look would be appreciated.

    1111111111111111111111111111111111111111111111111111111111

    3333111110000077777000002222211111111112222211111000002222

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)

    1111111111111111111111111111111111111114211111111111111111

    7775837587377777487658688478757687778985746766975877667776

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%

                                                 1

    4854764534474543443176443455447556754758688570656456677566544444646598

    5455013083515917068855158740846499291521640980848927242094186242814472

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%

CPU utilization for five seconds: 14%/0%; one minute: 12%; five minutes: 12%

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

136   192729000 124946322       1542  4.69%  4.83%  4.80%   0 Hulc LED Process

   4    42236260   2366789      17845  2.09%  0.91%  0.74%   0 Check heaps

105    28574143   5405898       5285  0.49%  0.50%  0.49%   0 hpm counter proc

  38     1857551     92006      20189  0.39%  0.04%  0.00%   0 Per-minute Jobs

165     1711405   1732079        988  0.29%  0.04%  0.00%   0 CDP Protocol

190    11049337  12822842        861  0.29%  0.27%  0.28%   0 Spanning Tree

146      357515   2173868        164  0.09%  0.01%  0.00%   0 HRPC qos request

145     6026652   1086949       5544  0.09%  0.10%  0.09%   0 HQM Stack Proces

230      144967  10841728         13  0.09%  0.01%  0.00%   0 DHCPD Receive

  50       61081   1086929         56  0.09%  0.00%  0.00%   0 Compute load avg

  97      464406   5405935         85  0.09%  0.01%  0.00%   0 Hulc ILP Alchemy

289     1306241   3795642        344  0.09%  0.00%  0.00%   0 IP SNMP

204     1871434   5405898        346  0.09%  0.05%  0.02%   0 PI MATM Aging Pr

291    19429080   4372748       4443  0.09%  0.00%  0.00%   0 SNMP ENGINE

  33      477514   6143435         77  0.09%  0.01%  0.00%   0 Net Background

  67     4676501 249650811         18  0.09%  0.07%  0.08%   0 RedEarth Rx Mana

  66     7641949  38214727        199  0.09%  0.10%  0.11%   0 RedEarth Tx Mana

175     1326425  12100919        109  0.09%  0.04%  0.01%   0 IP Input

  18        2198   5406010          0  0.00%  0.00%  0.00%   0 IPC Periodic Tim

  17           0         1          0  0.00%  0.00%  0.00%   0 IPC Zone Manager

  16        1566     90580         17  0.00%  0.00%  0.00%   0 IPC Dynamic Cach

  15           0         1          0  0.00%  0.00%  0.00%   0 IFS Agent Manage

  14         210        25       8400  0.00%  0.00%  0.00%   0 Entity MIB API

  19           0         1          0  0.00%  0.00%  0.00%   0 IPC Managed Time

  20        1760   5406010          0  0.00%  0.00%  0.00%   0 IPC Deferred Por

  26           0         1          0  0.00%  0.00%  0.00%   0 License IPC serv

  21           0         1          0  0.00%  0.00%  0.00%   0 IPC Seat Manager

  13           0         1          0  0.00%  0.00%  0.00%   0 Policy Manager

  29           0         2          0  0.00%  0.00%  0.00%   0 XML Proxy Client

  30           0         1          0  0.00%  0.00%  0.00%   0 ARP Snoop

--More--

Thanks for any ideas you might have to investigate this further.

2 REPLIES 2
Highlighted
Enthusiast

Highlighted

Hi,

I recommend you to go through the steps in the link below and do a cpu profiling when the situation is at its worst.

http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af0.shtml

So you then at least know what exactly causes the high CPU utilization. I hope CEF is enabled because I see here: 

"CPU utilization for five seconds: 14%/0%" that there are no interrupts currently present.

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