catalyst 4948 high CPU ?

[Tagir Temirgaliyev]

Hi

can some one help me?

what to do? where to find?          

Switch#sh proc cpu sort

CPU utilization for five seconds: 88%/20%; one minute: 78%; five minutes: 72%

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

  30   421870684 919568771        458 60.79% 53.34% 49.16%   0 Cat4k Mgmt LoPri

  29    36488000 167928067        217  4.39%  5.16%  5.30%   0 Cat4k Mgmt HiPri

  49     6328328  24656050        256  1.19%  1.10%  1.10%   0 Spanning Tree

  55     2513204  11490288        218  0.23%  0.21%  0.20%   0 IP Input

Switch#sh ver

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA4, RELEASE SOFTWARE (

fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Fri 23-Sep-05 13:31 by ssearch

Image text-base: 0x10000000, data-base: 0x114DFF08

ROM: 12.2(20r)EW1

Dagobah Revision 225, Swamp Revision 4

Switch uptime is 3 weeks, 14 hours, 3 minutes

System returned to ROM by power-on

System restarted at 20:40:25 ALM Sun May 13 2012

System image file is "bootflash:cat4000-i9s-mz.122-25.EWA4.bin"

cisco WS-C4948 (MPC8245) processor (revision 0) with 262144K bytes of memory.

Processor board ID FOX100301LW

MPC8245 CPU at 266Mhz, Fixed Module

Last reset from PowerUp

13 Virtual Ethernet interfaces

48 Gigabit Ethernet interfaces

511K bytes of non-volatile configuration memory.

Configuration register is 0x2102

Switch#

[Giuseppe Larosa · Accepted solution]

Hello Ttermirgaliyev,

there is a specific document about high cpu on C4500 and C4948 and there is the case of the C4K Mgmt Processes

see

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

You can follow the guidelines to identify the reasons of the issue

Hope to help

Giuseppe

[Alejandro Zuniga]

Hi,

As I can see, the process is the loPri this process as well as the hiPri are normally related to traffic, if you do a "show platform health" you will see the specific proceds that is going over que target.

You can also do a debug to see the interface(s) that are flooding que CPU:

"debug platform cpu packet all count"

Wait over 10 seconds and do a:

"show platform cpu packet statistics"

And you will see the interfaces that are sending traffic to the CPU and if you shut the specific port, the Cpu will go down and you know what is causing the issue.

You can also enable:

"mac address-table notification mac-move"

It will reveal with a show log if there is MAC flapping which also causes high CPU on this platform.

You can also take an sniffer directly to the switch's CPU by connecting a laptop running wireshark and configuring the following at the switch:

"monitor session 1 source cpu"

"monitor session 1 destination interface g#/#"

This interface is where the PC will be connected. With this you will see the exact ip address that is hammering the CPU.

Note, some commands might not work depending on the IOS.

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