02-23-2010 11:13 AM - edited 03-06-2019 09:52 AM
Hi,
I am facing high CPU utilzation due to Cat4k Mgmt Lopri
52 8721440 8889916 981 94.97% 93.34% 86.96% 0 Cat4k Mgmt LoPri
The output of sh platform health;
K2CpuMan Review 30.00 69.35 30 34 100 500 119 118
The output of sh packet statistics all;
L2 Fwd Low 18065480 3836 3579 2322 322
Please suggest how to find out the source which is making L2 Fwd Low packets.Due to which i am facing low response of applications.How to prevent this packets.I already have gone through the Cisco document.But it is not explaining how to find out the cause of these L2 Fwd Low packets.
Regards,
Ikbal C
03-01-2010 07:25 AM
Those process (Cat4k Mgmt HiPri, Cat4k Mgmt LoPri) are normally high because of the way the CPU is managed on 4000/4500 technologies, let me share with you the following information about it: http://www.cisco.com/warp/public/473/cat4500_high_cpu.html#understand This show processes cpu output shows that there are two processes that use the CPU- Cat4k Mgmt HiPri and Cat4k Mgmt LoPri . These two processes aggregate multiple platform-specific processes which perform the essential management functions on the Catalyst 4500. These processes process control plane as well as data packets that need to be software-switched or processed. In order to see which of the platform-specific processes use the CPU under the context of Cat4k Mgmt HiPri and Cat4k Mgmt LoPri , issue the show platform health command. Each of the platform-specific processes has a target/expected utilization of the CPU. When that process is within the target, the CPU executes the process in the high-priority context. The show processes cpu command output counts that utilization under Cat4k Mgmt HiPri . If a process exceeds the target/expected utilization, that process runs under the low-priority context. The show processes cpu command output counts that additional utilization under Cat4k Mgmt LoPri . This Cat4k Mgmt LoPri is also used to run background and other low-priority processes, such as consistency check and reading interface counters. This mechanism allows the CPU to run high-priority processes when necessary, and the idle CPU cycles that remain are used for the low-priority processes. To exceed the target CPU utilization by a small amount, or a momentary spike in utilization, is not an indication of a problem that needs investigation. However in our case its high. It seems that you may have hit a software bug CSCdz50987. This bug was fixed with release 12.1(14)EW.
03-02-2010 04:03 AM
Hi,
Thanks for the suggestions
I already have gone through that cisco document.Accordingly captured the output of some commands(sh platform health etc)The running ios vesion is 12.2(25)SG.Not EW version.Please suggest if anything more to troubleshoot
Regards,
Ikbal
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