Troubleshooting Tables; Troubleshooting Cpu Utilization - Cisco Catalyst 3750-E Software Configuration Manual

Troubleshooting Tables

To enable the fan failures feature, enter the system env fan-fail-action shut privileged EXEC command.
If more than one fan in the switch fails, the switch automatically shuts down, and this error message
appears:
Faulty (FRU/PS) fans detected, shutting down system!
After the first fan shuts down, if the switch detects a second fan failure, the switch waits for 20 seconds
before it shuts down.
To restart the switch, it must be power cycled.
Troubleshooting Tables
These tables are a condensed version of troubleshooting documents on Cisco.com.
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Troubleshooting CPU Utilization

This section lists some possible symptoms that could be caused by the CPU being too busy and shows
how to verify a CPU utilization problem.
that you can identify. It gives possible causes and corrective action with links to the
High CPU Utilization
Possible Symptoms of High CPU Utilization
Note that excessive CPU utilization might result in these symptoms, but the symptoms could also result
from other causes.
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Layer 3 switches:
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Verifying the Problem and Cause
To determine if high CPU utilization is a problem, enter the show processes cpu sorted privileged
EXEC command. Note the underlined information in the first line of the output example.
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
49-28
"Troubleshooting CPU Utilization" on page -28
"Troubleshooting Power over Ethernet (PoE)" on page -30
"Troubleshooting Stackwise (Catalyst 3750-E Switches Only)" on page -33
document on Cisco.com.
Spanning tree topology changes
EtherChannel links brought down due to loss of communication
Failure to respond to management requests (ICMP ping, SNMP timeouts, slow Telnet or SSH
sessions)
UDLD flapping
IP SLAs failures because of SLAs responses beyond an acceptable threshold
DHCP or IEEE 802.1x failures if the switch does not forward or respond to requests
Dropped packets or increased latency for packets routed in software
BGP or OSPF routing topology changes
HSRP flapping
Table 49-4 lists the primary types of CPU utilization problems
Chapter 49 Troubleshooting
Troubleshooting
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