I have started to see the problem for couple days where some hosts connected to 4507R stopped responding to ping and I saw huge latency upto 400msec. (In normal cases it is 1 msec becuase they are directly connected hosts. I couldn't find anythiing in the logs or interface errors but show proc cpu history and found that CPU went up to 100% in last 60 sec. Anyone know why it is doing this? Do I need a reboot?
I'm pinging from a different host which is directly connected to this swtich and our monitoring system (HpOV also on the same vlan)sends pages/email when it looses pings. The highest process I see on show proc cpu is
The HiPri and LoPri processes are normal.Your average CPU is also in the normal rage, while the max CPU is clearly hitting 100% within the last 60 minutes. So we can certainly infer that there are occasional spikes.
The questions is whether this truly correlates with the host response time. The first thing we need to determine is whether the spikes are caused by a process or by CPU switched traffic.
You'll need to capture the output of "show proc cpu" and "show platform health" and catch it while the CPU is spiked so that we can determine what's causing it. If it is very intermittent, you may have a hard time catching it, so if you have a way of scripting it with a cron job, that may be easier.
Also, here's a good doc on t-shooting CPU issues on this platform.
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