Hi community.
A 4507 switch has high CPU issues, if we introduce the command show processes cpu, the outputs says that a process called Cat4k Mgmt LoPri consumes aprox 80 to 90%:
4507#show processes cpu
CPU utilization for five seconds: 94%/4%; one minute: 95%; five minutes: 97%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
69 0 3 0 0.00% 0.00% 0.00% 0 ARP HA
70 0 2 0 0.00% 0.00% 0.00% 0 SISF HA Process
71 0 4 0 0.00% 0.00% 0.00% 0 MSP HA
72 0 2 0 0.00% 0.00% 0.00% 0 MSP HA IPC flow
73 0 1 0 0.00% 0.00% 0.00% 0 DHCPC HA
74 0 1 0 0.00% 0.00% 0.00% 0 DHCPD HA
75 0 1 0 0.00% 0.00% 0.00% 0 Network-rf Notif
76 61748992 169810858 363 4.31% 4.32% 4.31% 0 Cat4k Mgmt HiPri
77 350784471 392501329 893 78.07% 79.72% 81.35% 0 Cat4k Mgmt LoPri
78 880 395330 2 0.00% 0.00% 0.00% 0 Galios Reschedul
79 0 1 0 0.00% 0.00% 0.00% 0 IOS SGACL Helper
80 596 537 1109 0.00% 0.00% 0.00% 0 GaliosObflLogger
81 0 4 0 0.00% 0.00% 0.00% 0 IOS ACL Helper
82 0 1 0 0.00% 0.00% 0.00% 0 GalRedMsgProc
83 8 16 500 0.00% 0.00% 0.00% 0 RF Master Main T
84 0 11 0 0.00% 0.00% 0.00% 0 RF Master Status
Following the guide for High CPU utilization Catalyst 4500 switches (https://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/65591-cat4500-high-cpu.html), we introduce the command show platform health with the item named K5CpuMan Review consuming an 88% of CPU.
4507#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 0:31
VSI slot-03 1.00 0.05 6 0 100 500 0 0 0 9:28
K5 L2 Hardware Addre 2.00 0.00 20 10 100 500 0 0 0 2549:05
K5 L2 Hardware Mac L 1.00 0.00 2 0 100 500 0 0 0 0:00
K5RetStatsMan Review 2.00 0.00 5 0 100 500 0 0 0 0:00
K5CpuMan Review 30.00 88.37 30 21 100 500 166 167 124 5353:16
K5ForerunnerPacketMa 2.00 4.81 4 0 100 500 5 5 4 367:29
K5ForerunnerPacketMa 2.00 0.28 4 0 100 500 0 0 0 28:26
Introducing the command show platform cpu packet statistics we saw that the switch is dropping massive packets on l2 router (the complete output below):
4507#show platform cpu packet statistics
RkGenericPacketMan:
Packet allocation failures: 0
Packet Buffer(SW Common) allocation failures: 0
Packet Buffer(SW ESMP) allocation failures: 0
Packet Buffer(SW EOBC) allocation failures: 0
Packet Buffer(SW SupToSup) allocation failures: 0
Packets Dropped In Processing Overall
Total 5 sec avg 1 min avg 5 min avg 1 hour avg
-------------------- --------- --------- --------- ----------
84346886 42 23 23 25
Packets Dropped In Processing by CPU event
Event Total 5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Sa Miss 65560165 0 0 0 0
L2 Router 18773630 42 23 22 24
Input Acl Fwd 58 0 0 0 0
Input ACl Copy 11226 0 0 0 0
Output Acl Copy 1807 0 0 0 0
Packets Dropped In Processing by Priority
Priority Total 5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Normal 18781484 42 23 22 24
Medium 65560165 0 0 0 0
High 5237 0 0 0 0
Packets Dropped In Processing by Reason
Reason Total 5 sec avg 1 min avg 5 min avg 1 hour avg
------------------ -------------------- --------- --------- --------- ----------
STPDrop 473 0 0 0 0
AclActionDrop 1802 0 0 0 0
NoDstPorts 5 0 0 0 0
Tx Mode Drop 65570976 0 0 0 0
Extra packet due to RxProc hwAssisted Bridging 18773630 42 23 22 24
Total packet queues 64
Packets Received by Packet Queue
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Esmp 17334707 28 20 17 9
Input ACL fwd(snooping) 288909409 260 242 195 187
Host Learning 65554306 0 0 0 0
L2 Control 9084507 15 8 10 1
Input ACL log, unreach 11226 0 0 0 0
Ttl Expired 119 0 0 0 0
Output ACL log, unreach 1807 0 0 0 0
Adj SameIf Fail 457675 6 0 0 0
Bfd 73 0 0 0 0
L2 router to CPU, 7 6264331074 6337 19380 17625 15668
L3 Glean, 7 1309226 5 0 0 0
L3 Fwd, 7 80 0 0 0 0
L3 Receive, 7 1604009 7 2 2 1
Packets Dropped by Packet Queue
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Esmp 386 0 0 0 0
Host Learning 1040 0 0 0 0
Adj SameIf Fail 895 0 0 0 0
L2 router to CPU, 7 59168345 33 97 29 7
Anyone knows what is the association of the last line? What can be causing the overprocesing of the CPU?
Thanks.
