Cisco 4900M High CPU

Question

                   Hi,
We are observing high cpu of one of the backbone switch,
We enable eem script & below are the cpture
But we are not able to pin-point the issue.
event manager applet high_cpu
event snmp oid 1.3.6.1.4.1.9.9.109.1.1.1.1.3.1 get-type exact entry-op gt entry-val "65" poll-interval 5 action 1.01 syslog msg "------HIGH CPU DETECTED----, CPU: $_snmp_oid_val %"
action 1.02 cli command "enable"
action 1.03 cli command "term len 0"
action 1.04 cli command "debug platform packet all receive buffer"
action 1.05 cli command "show platform health | redirect slot0:high_cpu1"
action 1.06 cli command "show proc cpu sort | redirect slot0:high_cpu2"
action 1.07 cli command "show platform cpu packet statistics | redirect slot0:high_cpu3"
action 1.08 cli command "show platform cpu packet buffered | redirect slot0:high_cpu4"
action 1.09 cli command "show platform health | redirect slot0:high_cpu5"
action 1.10 cli command "show proc cpu sort | redirect slot0:high_cpu6"
action 1.11 cli command "show platform cpu packet statistics | redirect slot0:high_cpu7"
action 1.12 cli command "show platform cpu packet buffered | redirect slot0:high_cpu8"
action 1.13 cli command "show clock | redirect slot0:high_cpu9"
action 1.14 cli command "undebug all"
action 1.15 cli command "conf t"
action 1.16 cli command "no event
Switch version: cat4500e-entservicesk9-mz.122-50.SG3.bin
Model:  WS-C4900M 3 slot switch
Pls suggest
Br/Subhojit

Answer 1

HI,
I guess for every redirect command uses a vty session and thats why we might see this issue. I had a look at the logs again.
I see lots of SA Miss which is nothing but increase Source Address Miss. Have you verified if there are any topology changes(show spanning-tree detail | in ieee|exec|from|occurred)
switch##more slot0:high_cpu2   3
RkiosSysPacketMan:
Total                5 sec avg 1 min avg 5 min avg 1 hour avg
           641603851        50         9         0          0
Packets Dropped In Processing by CPU event
Event             Total                5 sec avg 1 min avg 5 min avg 1 hour avg
Sa Miss                      641599177        50         9         0          0
L3 Receive                           2         0         0         0          0
Input Acl Fwd                     4669         0         0         0          0
Sw Packet for Bridge                    3         0         0         0          0
Thanks & Regards,
Karthick Murugan
CCIE#39285