Troubleshooting For Cpu High - ZyXEL Communications ES 3500 Series Troubleshooting Manual

17 Troubleshooting for CPU high

Flowchart:
Check syslog
a. Verify frequency.
b. Is there any special log before CPU high?
c. Abnormal attack
Is it caused by management commands?
Some commands will cause the CPU high
a. Save configuration (Write memory)
b. Collect tech-support log
c. Sflow
Check port bandwidth
switch# show interfaces <port id>
Check CPU queue
switch> bcm pw
Is there any traffic may cause CPU high?
a. A lot of IGMP request
b. ARP broadcast storms
c. Ethernet broadcast storms
d. SNMP polling
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