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Beginner

Catalyst6500 CPU overloaded due to PIM process

Hi All,

 

I have a strange issue regarding the catalyst6500, The CPU get overloaded for shot period of time. The culprit process is "PIM" which occupies more than 50% of CPU.

 

Could you please help me to troubleshoot and figure out the root cause.

 

Thanks in advance.

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VIP Mentor

Re: Catalyst6500 CPU overloaded due to PIM process

what Model of 6500 and Supervisor you have here? what is the version code running?

 

here is the basic troubleshoot for high CPU :

 

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/63992-6k-high-cpu.html#multicast

 

Also, can you post  output of   show process cpu | ex 0.00%

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Beginner

Re: Catalyst6500 CPU overloaded due to PIM process

Hi Balaji, Hi Leo

 

Thank you for your interesting, in attachment the details requested.

 

PS : Juste pour information, the CPU is overloaded when there is a multicast subscription (just for short period) then it get back to normal situation. As an impact, the router lose all OSPF and BGP sessions.

 

Thank you for your precious help.

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VIP Mentor

Re: Catalyst6500 CPU overloaded due to PIM process

Your output shows normal for now,

 

I would like to see what Sup module you have in this E chassis. Do you have any local multicast service ? or where is this source IP and Destination IP - the connection you mentioned in the last post?

 

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Beginner

Re: Catalyst6500 CPU overloaded due to PIM process

Thank you for you reply.

 

  1    8  CEF720 8 port 10GE with DFC            WS-X6708-10GE      SAL1118NB84

  2    8  CEF720 8 port 10GE with DFC            WS-X6708-10GE      SAL1531L68Y

  3   48  CEF720 48 port 1000mb SFP              WS-X6748-SFP       SAL12383H6G

  4   48  CEF720 48 port 1000mb SFP              WS-X6748-SFP       SAL1118N992

  5    5  Supervisor Engine 720 10GE (Active)    VS-S720-10G        SAL1229XDC2

  6    5  Supervisor Engine 720 10GE (Hot)       VS-S720-10G        SAL1427M38P

  7    8  CEF720 8 port 10GE with DFC            WS-X6708-10GE      SAL1443XE2H

  8   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL1203D848

 

Here is the kinematics, I configured some servers that connect to the router to do the multicast subscription and get the incoming multicast stream. Unfortunately, I cannot provide you with src/dst IP addresses at this time. Otherwise, I would already like to find a way to fix this concern.

Thank you again for your support.

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Hall of Fame Community Legend

Re: Catalyst6500 CPU overloaded due to PIM process


@zizou6500 wrote:

the CPU is overloaded when there is a multicast subscription


This sounds like a multicast storm.
Is storm control enabled?

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Beginner

Re: Catalyst6500 CPU overloaded due to PIM process

Hi Leo,

 

Thank you for your reply.

 

No, it isn't enabled. Could you please give me more details about his use ?

 

 

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VIP Mentor

Re: Catalyst6500 CPU overloaded due to PIM process

here is the storm control config for reference.

 

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/storm.html

 

other note. this based on the inputs...but you still not understand the problem and where in your network.

 

This needs to be investigated further understand your network.

 

BB
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Beginner

Re: Catalyst6500 CPU overloaded due to PIM process

Hi Balaji,

 

Thank you for your support.

 

From the mroute table, I can see many multicast routes in "Partial-SC". I found a solution that consist in setuping a rate-limit for the partial-SC packets, could you please advise and confirm if that can resolve the CPU issue ?

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VIP Mentor

Re: Catalyst6500 CPU overloaded due to PIM process

As i was mentioned earlier post, we do not have visibility on your setup and output or configuration, we are only guessing the solution may fix, trying is your option and once you try that option if not fixed you need to try another option - which causes the issue.

 

i would suggest reading below information: and tweak as required, and let us know what was the tweak done in terms of config.

 

 

https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html

 

 

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Hall of Fame Community Legend

Re: Catalyst6500 CPU overloaded due to PIM process

Post the complete output to the following commands:
1. sh version;
2. sh module;
3. sh proc cpu hist; and
4. sh proc cpu sort | ex 0.00
NOTE: Put the output in a notepad and attach the notepad to the thread.
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