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New Member

High CPU Due to Interrupts

Hey guys;

I have a problem that tired me, and hope to find someone can help!

I have Cisco 6509-E with SUP720 which run multihomed BGP and worked very perfectly.

I'm running also: OSPF/SNMP/PBR/ACL/Distributed CEF

ISP1 bandwidth is 2.5 Gbps ( Etherchannel with 3 Interfaces) , ISP2 bandwidth is 350 Mbps.

The problem is that i have from 8am to 3pm and from 7pm to 12pm a very high CPU rate due to Interruption however ranning CEF.

All The time the CPU Rate is 87%/81%, which means that no process have a high rate

IOS Used:

s72033-advipservicesk9-mz.151-1.SY1.bin

Note: when i shutdown ISP1 the cpu go down to 7%/2%

Any show results needed i can provide it to you.

Here is some outputs can help.!

R#show switching status

Configured action on switching-bus stall : crash

Current status of switching-bus: OK

R#show interfaces switching

Port-channel1 ISP1

          Throttle count          0

        Drops         RP      29985         SP          0

  SPD Flushes       Fast      29985        SSE          0

  SPD Aggress       Fast          0

SPD Priority     Inputs         11      Drops          0

     Protocol       Path    Pkts In   Chars In   Pkts Out  Chars Out

        Other    Process        102       8058          0          0

            Cache misses          0

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

           IP    Process    9593489 1350737730    9677323 1185440863

            Cache misses          0

                    Fast 1819299726 185015130948 1819196261 184996005655

               Auton/SSE 2459670049 2927525463874 3367861493 392677475638

          ARP    Process       4562     273720          5        540

            Cache misses          0

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

R#show ip cef switching statistics

       Reason                          Drop       Punt  Punt2Host

RP LES No route                       28010          0        356

RP LES Packet destined for us             0     139862          0

RP LES No adjacency                    1703          0          0

RP LES Incomplete adjacency           14161          0          0

RP LES TTL expired                        0          0      99455

RP LES Routed to Null0              2851787          0      89095

RP LES Features                      138559          0      28729

RP LES Unclassified reason             6468          0          0

RP LES Neighbor resolution req         2732         19          0

RP LES Total                        3043420     139881     217635

All    Total                        3043420     139881     217635

R#show ip cef switching statistics feature

IPv4 CEF input features:

       Feature                Drop    Consume       Punt  Punt2Host Gave route

       Access List          138730          0          0      28743          0

       Policy Routing            0          0          0          0          3

Total                       138730          0          0      28743          3

IPv4 CEF output features:

       Feature                Drop    Consume       Punt  Punt2Host    New i/f

Total                            0          0          0          0          0

IPv4 CEF post-encap features:

       Feature                Drop    Consume       Punt  Punt2Host    New i/f

Total                            0          0          0          0          0

IPv4 CEF for us features:

       Feature                Drop    Consume       Punt  Punt2Host    New i/f

Total                            0          0          0          0          0

IPv4 CEF punt features:

       Feature                Drop    Consume       Punt  Punt2Host    New i/f

Total                            0          0          0          0          0

IPv4 CEF local features:

       Feature                Drop    Consume       Punt  Punt2Host Gave route

Total                            0          0          0          0          0

Regards

5 REPLIES
Hall of Fame Super Gold

High CPU Due to Interrupts

What IOS are you using?

New Member

High CPU Due to Interrupts

s72033-advipservicesk9-mz.151-1.SY1.bin

I don't think that it's a IOS bug because i ran this switch since 3 months and the problem begin since last few days.

New Member

High CPU Due to Interrupts

I follow something from this thread:

https://supportforums.cisco.com/thread/2209968

but it didn't help or i didn't make it help me.

So please anyone can guide me ? the situation is very urgent !!!!!

Hall of Fame Super Gold

High CPU Due to Interrupts

So please anyone can guide me ? the situation is very urgent !!!!!

One question for you then, if this is urgent why did you NOT contact Cisco TAC and raise a Case?

This is a forum.  The people who posts suggestions and recommendations are VOLUNTEERS. 

Back to your issue ... Try 15.1(2)SY.

New Member

High CPU Due to Interrupts

I solved the problem, Thanks VOLUNTEERS

I found that i must make some MLS rate-limit to unicast traffic which hit my cpu at high rate without handling of CEF

Thanks Alot

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