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4500 Switch -High Utilization

Hi Experts

I am facing in between high utilization issue with cisco 4507 switch with Sup-6LE..I checked the output of show proc cpu and found that the following two processes are using most of the cpu cycles

53   183976532 813503058        226  4.55%  3.99%  4.05%   0 Cat4k Mgmt HiPri
  54  1143450460 527837261       2166 45.11% 25.33% 29.60%   0 Cat4k Mgmt LoPri

The output of show platform health suggets that following are 2 active processes..

K5L3Unicast Adj Tabl   2.00   6.77     15     11  100  500   14  13    9  7154:35
K5 L2 Hardware Addre   2.00   7.92     20     13  100  500   20  18   10  11194:05

from cisco documentation what i could understand is these 2 processes are more or less related host flaps/l2 loops...

The output of show platform cpu packet statastics is not giving me much insight on which of teh cpu queues are getting more traffic.(output mentioned below)..so i am not able to conclude exact cause for this utilization..

can anyone suggest me the cause for this uitlization with the available data..

------------------ show platform cpu packet statistics ------------------

RkiosSysPacketMan:
Packet allocation failures: 0
Packet Buffer(Software Common) allocation failures: 0
Packet Buffer(Software ESMP) allocation failures: 0
Packet Buffer(Software EOBC) allocation failures: 0
Packet Buffer(Software SupToSup) allocation failures: 0
IOS Packet Buffer Wrapper allocation failures: 0

Packets Dropped In Processing Overall

Total                5 sec avg 1 min avg 5 min avg 1 hour avg
-------------------- --------- --------- --------- ----------
            57466647         6         1         3          1

Packets Dropped In Processing by CPU event

Event             Total                5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Sa Miss                       57175936         6         1         3          1
Input Acl Fwd                       11         0         0         0          0
Input ACl Copy                  290016         0         0         0          0
Output Acl Copy                    678         0         0         0          0
Sw Packet for Bridge                    6         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                          290705         0         0         0          0
Medium                        57175942         6         1         3          1

Packets Dropped In Processing by Reason

Reason             Total                5 sec avg 1 min avg 5 min avg 1 hour avg
------------------ -------------------- --------- --------- --------- ----------
SrcAddrTableFilt                     14         0         0         0          0
STPDrop                             179         0         0         0          0
L2DstDrop                             6         0         0         0          0
AclActionDrop                       230         0         0         0          0
NoDstPorts                          448         0         0         0          0
Tx Mode Drop                   57465770         6         1         3          1

Total packet queues 64

------------------ show platform cpu packet driver ------------------


Forerunner Packet Engine 1.21

Receive Queues: received packets summary
Qu  Capac  Guara  CurPo  Unpro  Accum   Kept  BperP           Packets
2   2512    112   1914      0      2      2    514             89847
3    208     32    203      0      3      3     92          61739684
8    512    512    384      0      0      0    794          57147365
9   2512    304   1081      0      1      1    135          13792032
10    112     16     48      0      0      0     68            290016
25    112     32     75      0      3      3     68            269417
42    112     16      6      0      6      6     81               678
57     64     16     39      0      7      7    481         136869888
60    512    112    162      0      2      2     64           1105057
61    208     64     68      0      4      4    113           5526525
62   1504     64     45      0      5      5    227                45
63   1504     64   1303      0      7      7     88         286228968

Receive Queues: dropped packets summary
Qu     Total Packets      Drop No Cell      Drop Overrun     Drop Underrun
3          61739684               307                 0                 0
8          57147365           1062608                 0                 0
57         136869888             63444                 0                 0
61           5526525             27454                 0                 0

Transmit Queues
Qu  PosAdd  Pendng           Packets               Bytes
0     223       1         561612679        100034356452
1    1321       0        1679799597        108824730606

Transmitted via RxProc: 137395430

Link Stats
Rx Ucast 487581479, Mcast 13967935, Bcast 63456173
Tx Ucast 434391161, Mcast 1681999840, Bcast 125021337
Rx Jumbo Packets 0, No Jumbo Buffer 0
Interrupt 885857587, Rx review 471202073, Driver review 414708495
Rx Buffers taken 563850560, returned 563850560
Run Mode 4, reset count 0, lost Tx packets 0
Free count 11808, guaranteed 3912, ptr 0E14C800, base 0E14A500
Rx overruns 0, Rx underruns 0 Freelist errors 0

1 REPLY
Cisco Employee

Re: 4500 Switch -High Utilization

Hi,

from the symtom, it is traffic. you could sniffer for about 2-3 min and analysis what traffic puncted to CPU.

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml#tool1

Regards,

Jack

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