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RBS_79242's avatar
RBS_79242
Icon for Nimbostratus rankNimbostratus
Sep 25, 2013

Monitor / report dropped packets by TMM policing module on VE

Hi,

 

I have a LTM VE running 11.2 with a 25mbps license. I have enabled threshold alerting and can see that the F5 is reaching 24mbps in some cases. I understand that when the 25mbps threshold is breached that the F5 will "silently" drop packets (policing).

 

Is there a way that I can see how many packets have been dropped? Ideally I would want to read (and graph) this via SNMP. But I would be happy with a command which could provide me with the current total.

 

Thanks

 

Rowan

 

4 Replies

  • Hi Rowan

     

    You will see in /var/log/ltm when you start to reach your limit. I don't know of any counter values to extract though.

     

    Regards Thomas

     

  • You can view the drops using tmctl:

     tmctl -d blade tmm/if_shaper
    ingress_avg ingress_red ingress_drops egress_drops
    ----------- ----------- ------------- ------------
            100           0             0            0
    

    You can create a custom script to access via SNMP:

    sol13596: Creating custom MIB entries on the BIG-IP system

    http://support.f5.com/kb/en-us/solutions/public/13000/500/sol13596.html

    If you get stuck let us know. Else, if you figure out a solution, it would be great to add to the Codeshare: https://devcentral.f5.com/wiki/AdvDesignConfig.codeshare.ashx

    Thanks, Aaron

  • Thanks Aaron. Are you able to please supply some information on the fields I am seeing?

     

    ingress_avg: 100 ingress_red: 0 ingress_drops: 0 egress_drops: 921

     

    Is it only the egress drops which will increase as the policing kicks in?

     

    Are the values number of packets?

     

    What are the remaining fields for? When would I expect to see values in these fields?

     

    I have done a Google search for "tmm/if_shaper" and get NOTHING, I have also searched DevCentral and F5.com and get nothing - this is clearly an obscure "table", thanks for identifying it.

     

    Rowan

     

    • hooleylist's avatar
      hooleylist
      Icon for Cirrostratus rankCirrostratus
      Can you email me and I'll get back to you with details? aaron at f5 dot com Thanks, Aaron