Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

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Ah_Fat_2262's avatar
Ah_Fat_2262
Icon for Nimbostratus rankNimbostratus
Mar 27, 2012

F5 Failover

Hi,

 

 

I have deployed a pair of F5 LTM 1600 and have configured the redundancy and fail-over. Thus, I would like to ask that when the active F5 failover to the standby F5, is the failover a stateful failover? meaning to say that during a failover will the active connection to the Virtual Server on the active F5 being failover to the the standby thus there is interruption to the user connection?

 

 

I noticed that there is an option of "Connection Mirror" for Virtual Server. However, F5 website says the they recommend that to enable this option on Performance VS only.

 

 

Please advice.

 

2 Replies

  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Mar 27, 2012
    Ah Fat

     

     

    There are two types of mirroring - connection and persistence. You're right, it's not the recommended option to enable connection mirroring - due to the overhead involved. I wouldn't enable it for http connections but possibly ftp / rdp / ssh etc.

     

     

    Persistence mirroring, on the other hand, is recommended. This means that on failover the standby appliance is aware of which pool member each connection is going to - this ensures a smooth failover (and hopefully invisible to the user). You don't need to mirror cookie persistence though - as this is client based.

     

     

    Hope this helps,

     

    N
  • Cholito_15468's avatar
    Cholito_15468
    Icon for Nimbostratus rankNimbostratus
    Mar 27, 2012

     

    hi,

     

     

    You can create a profile and persistence Enable this option.

     

    Trying cpu usage and monitoring.

     

     

    testing and monitoring the CPU consumption.