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high CPU utilization on my Cisco 7206VXR (NPE-G1)

Unanswered Question
Jun 21st, 2012
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Hi Friends,


Need your help. I am observing very high CPU utilization on my Cisco 7206VXR (NPE-G1) Router. We have done all the necessary troubleshooting but not able to identify root cause. I need your help to identify the root cause.


R1#sh process cpu | i 319

  19     1546984  13195745        117  0.07%  0.04%  0.05%   0 ARP Input

293          24      3196          7  0.00%  0.00%  0.00%   0 TCP Listener

319   174635820  91704341       1904  2.00%  4.04%  3.55%   0 BGP Router

R1#sh process cpu | i 109

   6        1092      3936        277  0.00%  0.00%  0.00%   0 Pool Manager

  95     2404024 109044673         22  0.07%  0.03%  0.02%   0 Spanning Tree

109         284       139       2043  0.00%  0.00%  0.00%   0 PPP IP Route

R1#sh process cpu | i 105

105   184299056  43534715       4233  2.39%  4.00%  4.45%   0 IP RIB Update

R1#sh ver | i .bin

System image file is "disk2:c7200-adventerprisek9-mz.124-22.T5.bin"

R1#sh process cpu | e 0.00%  0.00%  0.00%

CPU utilization for five seconds: 37%/30%; one minute: 48%; five minutes: 48%

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

   2       84432    807096        104  0.07%  0.03%  0.02%   0 Load Meter

   5    12508996    693791      18029  0.00%  0.22%  0.23%   0 Check heaps

  19     1547136  13197135        117  0.07%  0.04%  0.05%   0 ARP Input

  39     5212096   1553431       3355  0.31%  0.13%  0.12%   0 Net Background

  43    51486852   4386344      11738  1.19%  1.17%  1.19%   0 Per-Second Jobs

  49      215888    820053        263  0.00%  0.03%  0.02%   0 Compute load avg

  50     1279180     76565      16707  0.00%  0.02%  0.00%   0 Per-minute Jobs

  67      287428  13751297         20  0.07%  0.01%  0.00%   0 Voice PA Proc

  82    32287968 216884136        148  0.39%  0.44%  0.43%   0 IP Input

  95     2404188 109049242         22  0.00%  0.03%  0.02%   0 Spanning Tree

104     4330112    247267      17511  0.00%  0.09%  0.06%   0 IP Background

105   184317404  43536696       4233  1.27%  4.65%  4.64%   0 IP RIB Update

107      457488   5720165         79  0.07%  0.08%  0.08%   0 CEF: IPv4 proces

112      189312  22453864          8  0.07%  0.04%  0.05%   0 TCP Timer

140      853752 924776262          0  0.31%  0.29%  0.30%   0 HQF Shaper Backg

141       84108  39143458          2  0.00%  0.01%  0.00%   0 RBSCP Background

173      196688    437440        449  0.00%  0.01%  0.00%   0 TPLUS

188    27240072  56483059        482  0.31%  0.48%  0.50%   0 BGP I/O

190    27909872    316511      88181  0.00%  0.87%  0.84%   0 BGP Scanner

216         680       514       1322  0.23%  0.18%  0.08%   2 SSH Process

253      111224  39148448          2  0.00%  0.02%  0.00%   0 CCPROXY_CT

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

257      529752   2439497        217  0.07%  0.01%  0.00%   0 LDP

258     1166712  29138570         40  0.07%  0.07%  0.07%   0 TDP Hello

259      293012   1975923        148  0.00%  0.02%  0.00%   0 Tag Control

261     1567032    414671       3778  0.07%  0.04%  0.05%   0 MFI LFD Stats Pr

264       99176   4536258         21  0.00%  0.01%  0.00%   0 IGMP Input

265      120920  39470863          3  0.00%  0.01%  0.00%   0 Mwheel Process

266      758428  86705395          8  0.15%  0.11%  0.10%   0 PIM Process

273      335092 121538894          2  0.07%  0.07%  0.07%   0 PPP manager

274      287772 121539367          2  0.00%  0.05%  0.05%   0 PPP Events

276    25510540  15956971       1598  0.31%  0.60%  0.63%   0 Collection proce

279       62448   3983904         15  0.00%  0.01%  0.00%   0 MPLS HC Counter

285       75224  39354897          1  0.00%  0.01%  0.00%   0 FR Broadcast Out

294     1652096  15266545        108  0.00%  0.06%  0.06%   0 IP SNMP

295      731164   7538178         96  0.00%  0.03%  0.01%   0 PDU DISPATCHER

296     2756396   7552030        364  0.00%  0.20%  0.17%   0 SNMP ENGINE

309      811248   5034073        161  0.00%  0.01%  0.00%   0 OSPF-200 Router

313     4059664  13742716        295  0.07%  0.01%  0.00%   0 OSPF-480 Router

315      567256   4390468        129  0.00%  0.02%  0.00%   0 OSPF-590 Router

316     1982792   8404332        235  0.00%  0.01%  0.00%   0 OSPF-1 Router

319   174652228  91708521       1904  2.23%  3.78%  3.80%   0 BGP Router

327      677216  16678568         40  0.07%  0.05%  0.06%   0 OSPF-1 Hello

328      131448   2608238         50  0.07%  0.00%  0.00%   0 OSPF-1255 Hello

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

332     1515184   6444219        235  0.07%  0.01%  0.00%   0 OSPF-450 Router

335       21440       601      35673  0.00%  1.50%  1.83%   6 SSH Process

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Oerlikon_NZ Thu, 06/21/2012 - 07:39
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Can you clarify what you mean by high CPU utilisation i.e +80%.  Can you do a "show proc cpu sorted"  How much free memory does the router have?  BGP appears to be enabled, so how big(how many routes) is the BGP routing table?

handoko wiyanto Thu, 06/21/2012 - 10:36
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hi Tarun,


i had similar problem in the old days, using NPE-G2 running bgp and mpls. i did open a tac case, but then this case were handled by my team mate, so im not quite sure the workaround.


really interesting what you have here.

tarunpathak84 Thu, 06/21/2012 - 12:05
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Can any body let me know the workaround. Eager to know the right solution

Joseph W. Doherty Thu, 06/21/2012 - 17:42
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What's the aggregate traffic volume when you see about 50% CPU?  From your stats, looks like CPU is forwarding packets.

handoko wiyanto Thu, 06/21/2012 - 21:43
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hi Tarun,


after contacting my colleages, it turns out that it was ios bug because of an incomplete mpls label. the solution was upgrading the ios to SRD.


i dont know if the environment are the same with yours.


regards,

tarunpathak84 Fri, 06/22/2012 - 00:03
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It is one of the core router. Aggregrate traffic will be around 75-80 Mb.


Is this IOS Image having bug. Please confirm. I am not able to find same it Bug Tool Kit.

R1#sh ver | i .bin

System image file is "disk2:c7200-adventerprisek9-mz.124-22.T5.bin"


Rgds

handoko wiyanto Sun, 06/24/2012 - 00:02
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on my case, it was because the router using SRB1, ios bug when receiving incomplete mpls label packet, causing the cpu process become very high. the workaround was upgrading the to SRD releases.


im suggesting that you engage with cisco TAC team


regards,

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