关于Cat4k High CPU TS的相关命令

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4500 High Cpu Action Plan.No.1

Config “no ip unreachables” and “no ip redirects” in all L3 interface or SVI. General the “ip unreachables” and “ip redirects” will affect cpu utilization in 4000/4500. So if  don’t requirement for “ip unreachables” and “ip redirects”. Suggest to turn off the feature first. Then confirm the problem will be clear.
关于redirect的内容,可以参考之前的文章《ICMP 重定向的一些问题》和《Layer 3 层网络中的重定向》 ,另外官网也有详细介绍: When Are ICMP Redirects Sent?

4500 High Cpu Action Plan.No.2

If the cpu couldn’t downgrade, then capture follow information:

#clear counters 
#show int switching  //some times #show ip int
#show proc cpu sorted | exclude 0.00
#show proc mem sorted
#show platform health
#show platform cpu packet statistics all

4500 High Cpu Action Plan.No.3

If found K2CpuMan Review and K2PacketBufMonitor-P take most CPU.

Base on your information, I found K2CpuMan Review and K2PacketBufMonitor-P take most cpu.
----------------------------------------------------------------------------------
                     %CPU   %CPU    RunTimeMax   Priority  Average %CPU  Total
                     Target Actual Target Actual   Fg   Bg 5Sec Min Hour  CPU
K2CpuMan Review       30.00   6.26     30     35  100  500    5   4    3  1242:32
K2PacketBufMonitor-P   1.00   2.52     10      5  100  500    2   2    2  868:10

So in order to further troubleshooting, I suggest the following action plan:
Capture packets that arrived to cpu:

Switch#show platform health
Switch#show platform cpu packet statistics all
Switch#debug platform packet all receive buffer   //open debug, waiting 5 minutes
Switch#show platform cpu packet buffered
Switch#undebug all   //close debug Switch#show platform cpu packet buffered
Switch#show mac-address-table count
Switch#show platform hardware mac-address-table count

—————————————–
Here is a useful link for troubleshooting high cpu:
High CPU Utilization on Cisco IOS Software-Based Catalyst 4500 Switches
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

4500 High Cpu Action Plan.No.4

clear counter  //waiting 5 min Show int stats
Show interface switching          
Show ip traffic
Show ip arp summary  //gather twice and with 5 min interval
Show ip arp
Show mac-address-table count
Show mac-address-table aging
Show ip route
Show ip cef
Show plat soft ip route all
Show plat soft ip route sum
Show plat soft ip adj all
show plat soft ip route network 0.0.0.0 0.0.0.0
Show plat hard ip route all
Show plat hard ip route sum
Show plat hard ip adj all
show adjacency summary
本文出自 Frank's Blog

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