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f5beginner's avatar
f5beginner
Icon for Cirrostratus rankCirrostratus
Jun 23, 2019

Exceed bandwidth utilization on standby device

Hello All, I have two virtual F5 in HA, one of them Active and second one is in standby mode. From my monitoring I received ping delay, which is around 400ms, so I checked logs on F5.   On acti...
  • Dario_Garrido's avatar
    Dario_Garrido
    Jun 25, 2019

    Yes, the problem you are facing is because of this UDP 8116 traffic. There are 360 packets (of 500) related to this flow.

    # cat output.txt | grep 8116 | wc -l
360

    This is not a specific problem of F5, so you should check your enviroment to figure out what the source of traffic is and how to stop it.

    BTW, I would appreciate if you mark my answer as 'the best' or give me some upvote :-).

    KR,

    Dario.

f5beginner's avatar
f5beginner
Icon for Cirrostratus rankCirrostratus
Jun 25, 2019

Hi Dario Garrido, thanks for help on switch level I defined only vlans which are used and now it looks it helped. Everything was caused by broadcasts, which abnormaly increasing throughput. What I still do not understand is, that why was throughput higher on Standby box as on Active box.

  • Dario_Garrido's avatar
    Dario_Garrido
    Icon for MVP rankMVP
    Jun 25, 2019

    Actually, I don't know for sure. That depends on the enviroment.

     

    I suspect that the broadcast was generated because the standby was ignoring all this traffic. Maybe active device was responding with a reset packet and standby wasn't.

     

    KR,

    Dario.