[cisco-voip] C2960S Switch High CPU

Fri May 6 09:15:37 EDT 2011

All your lower end switches run higher CPU levels, I would expect 84% to be normal, unless you have a bunch of 2960s with a baseline already established and just this one is showing higher than normal.

I'd run Wireshark off a port on it and look for some broadcast storms, defective nic, etc.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of James Jung
Sent: Thursday, May 05, 2011 10:41 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] C2960S Switch High CPU

Hi guys

I have C2960S switches and one of it has high cpu rate constantly.
It seems that this switch processes lots of traffic and shows lots of output drops too.
The show process cpu sort shows that 'VLAN Manager' process takes up 40 to 60% of the total cpu time.
Does anyone know about the VLAN Manager process? Is this because traffic load?

show interfaces summ

 *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count

  Interface               IHQ   IQD  OHQ   OQD  RXBS RXPS  TXBS TXPS TRTL
-------------------------------------------------------------------------
  Vlan1                    0     0    0     0     0    0     0    0    0
* Vlan5                    0     0    0     0  4000    4  4000    4    0
  FastEthernet0            0     0    0     0     0    0     0    0    0
* GigabitEthernet1/0/1     0     0    0 32591 17096000  3361 12046000  3614    0
* GigabitEthernet1/0/2     0     0    0 200324518 9420000  1702 10401000  1645    0
* GigabitEthernet1/0/3     0     0    0  1021 2662000  1601 8050000  2241    0
* GigabitEthernet1/0/4     0     0    0 5212707 398000  254 332000  531    0
  GigabitEthernet1/0/5     0     0    0     0     0    0     0    0    0
* GigabitEthernet1/0/6     0     0    0 7449328 544000  383 2142000  867    0
* GigabitEthernet1/0/7     0     0    0 6268202 20000   15 1333000  485    0
  GigabitEthernet1/0/8     0     0    0     0     0    0     0    0    0
GigabitEthernet1/0/9     0     0    0     0     0    0     0    0    0

show controllers cpu-interface

cpu-queue-frames  retrieved  dropped    invalid    hol-block  stray
----------------- ---------- ---------- ---------- ---------- ----------
rpc               0          0          0          0          0
stp               34876674   0          1741       0          0
ipc               0          0          0          0          0
routing protocol  34399658   0          312        0          0
L2 protocol       452136688  317119329  4290266136 0          0

show process cpu sorted

CPU utilization for five seconds: 83%/20%; one minute: 84%; five minutes: 84%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
 272   699167327 140378773       4980 47.78% 45.89% 46.28%   0 VLAN Manager
 135    71568385  68413023       1046  7.99%  8.48%  8.55%   0 Hulc LED Process
 188    24754528  32288669        766  0.69%  0.75%  0.74%   0 Spanning Tree
 104    18693053   3192604       5855  0.39%  0.50%  0.53%   0 hpm counter proc

Thanks in advance guys.
James Jung

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