I have a 3548p that is showing abnormally high CPU utilization:
CPU utilization
---------------
five seconds: 97%; one minute: 100%; five minutes: 88%
five seconds: 100%; one minute: 80%; five minutes: 88%
five seconds: 62%; one minute: 94%; five minutes: 82%
five seconds: 100%; one minute: 81%; five minutes: 87%
five seconds: 100%; one minute: 100%; five minutes: 88%
five seconds: 100%; one minute: 100%; five minutes: 92%
This is causing latency to the switch and also delay when managing via CLI:
Packets: Sent = 55797, Received = 55776, Lost = 21 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 13ms, Maximum = 3845ms, Average = 249ms
Pinging through the switch to connected devices seems fine. This switch has very low load: it is powering about 7 IP phones and 3 IP cameras, and has only about half of it's ports in use. It is not stacked and no VLANs are defined. It does have an EPS-470 attached for redundancy. Flow control is disabled globally, and STP is disabled selectively on some ports. Otherwise, its conf is very nearly factory default.
I have rebooted the switch and the issue comes back. It is running latest code (2.0.0.51). I noticed there is no "Show CPU Process" command in the CLI. How can I troubleshoot to see what is causing the load? I have enabled debug logging on the serial console and see no obvious cause, in fact no messages are being generated at all except login/logoff events.
Conf:
....# show run
interface range ethernet e(34,38)
spanning-tree disable
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
interface vlan 1
ip address ....
exit
ip default-gateway ....
hostname ....
logging console debugging
username admin password ... level 15 encrypted
sntp unicast client enable
sntp unicast client poll
sntp server a.b.c.d poll
ip domain-name ....
ip name-server ....
Default settings:
Service tag: ....
SW version 2.0.0.51 (date 11-Feb-2013 time 10:45:21)
Fast Ethernet Ports
==========================
no shutdown
speed 100
duplex full
negotiation
flow-control off
mdix auto
no back-pressure
Gigabit Ethernet Ports
=============================
no shutdown
speed 1000
duplex full
negotiation
flow-control off
mdix auto
no back-pressure
interface vlan 1
interface port-channel 1 - 15
spanning-tree
spanning-tree mode STP
qos basic
qos trust cos
....#