Method1:-
General commands for CPU issue:
Switch01#show processes cpu history
9999999999999999999999999999999999999999999999999999999999
5555999999999999999888889999988888999997777799999111119999
100 ************************************************* ****
90
**********************************************************
80
**********************************************************
70
**********************************************************
60
**********************************************************
50
**********************************************************
40
**********************************************************
30
**********************************************************
20
**********************************************************
10
**********************************************************
0....5....1....1....2....2....3....3....4....4....5....5....
0
5 0 5
0 5 0
5 0 5
CPU% per
second (last 60 seconds)
Switch01#show processes cpu sorted | i e 0.0
CPU utilization for five seconds: 99%/0%; one minute: 97%; five
minutes: 98%
PID Runtime(ms) Invoked
uSecs 5Sec 1Min
5Min TTY Process
56 6220456 444066129 14 91.77% 92.82% 93.27% 0 Cat4k Mgmt LoPri
55 27726431353101333254 0
6.78% 4.08% 4.01%
0 Cat4k Mgmt HiPri
116 25773610 710067067 36
0.31% 0.26% 0.24%
0 Spanning Tree
Switch01#show platform health
%CPU %CPU
RunTimeMax Priority Average %CPU
Total
Target Actual
Target Actual Fg Bg 5Sec Min Hour CPU
RkiosObflMan 0.50 0.00
4 0 100
500 0 0
0 127:59
.
.
K5 L2 Hardware Addre 2.00 89.87
20 10 100
500 122 121 93
105441:30
.
Switch01#sh spanning-tree detail | in ieee|from|occurr|is exec
Switch01#sh int counters err
Switch01# sh int counters all
Switch01# clear counters int
One
of the best ways to see a problem like this is to use mac address-table
notification:
Switch01(config)#mac address-table notification mac-move
Switch01#sh log
Dec 8
20:45:25.758 UTC: %C4K_EBM-4-HOSTFLAPPING: Host 00:05:64:30:72:3B in vlan 733
is moving from port Gi1/18 to port Te1/52
Dec 8
20:45:25.758 UTC: %C4K_EBM-4-HOSTFLAPPING: Host 00:05:64:30:72:3B in vlan 732
is moving from port Te1/52 to port Gi1/18
We need to check the device connected to the above two ports and
fixing the MAC flap will fix the CPU issues.
Additionally, below debug can also help and it’s safe to run during high
CPU
debug
platform packet all receive buffer ------------> Enable debug
show
platform cpu packet buffered ---------------> Packets that were captured
after enabling the debugs.
debug
platform packet all count --------------> Enable debug command to enable
packet count per interface.
show
platform cpu packet statistics ----------> This provides packet received on
per interface basis.
General commands for CPU issue:
term width 511
show tech
show tech
show ver
show module
show processes cpu history
show system resources
show processes cpu sort
show hardware internal cpu-mac inband stats
show hardware internal cpu-mac inband counters
show span get | no
show hardware internal bcm-usd errors
show hardware internal bcm-usd event-history msgs
show hardware internal bcm-usd event-history errors
show hardware internal bcm-usd config tlv-type asic 0
show processes cpu sort
show tech-support bcm-usd | no-more
show tech-support detail | no
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