I am facing intermittent high CPU in my LAN network. We have one L3 WS-C3750V2-24TS (c3750-ipbasek9-mz.122-50.SE5)switch and two L2 switches,
WS-C2960S-48TS-S model (c2960s-universalk9-mz.122-55.SE3/c2960s-universalk9-mz.122-55.SE3.bin). The CPU is hitting 90-100% randomly for 1 to 2 hours. No logs are generated about this. Now the CPU seems normal.
sh proc c | ex 0.00
CPU utilization for five seconds: 6%/0%; one minute: 7%; five minutes: 6%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
The CPU becomes too busy when the CPU receives too many packets from the switch hardware or when a system process consumes too much CPU time. When either of these functions uses CPU resources to the detriment of the other, the CPU is too busy
To determine switch CPU utilization
#show processes cpu sorted | ex 0.00%
#show processes cpu history
If the switch is being flooded by a specific packet type, the hardware places that packet type into the appropriate CPU queue and counts it. Enter the show controllers cpu-interface privileged EXEC command to see the packet count per queue.
#show controllers cpu-interface
Each CPU receive queue has a packet-count maximum. When the receive queue maximum is reached, the switch hardware discards packets destined for the congested queue. The switch counts discarded packets for each queue. Increased discard counts for a particular CPU queue mean heavy usage for that queue
#show platform port-asic stats drop
#show spanning-tree detail | in executing|changes|from - To verify the spanning-tree changes
#show interface | include line|\drops - To see any drops are incrementing on interface level
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