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Krishna_251070's avatar
Krishna_251070
Icon for Nimbostratus rankNimbostratus
Mar 29, 2018

Traffic Group Failover when Trunk Fails

Hello,   I have a pair of F5 LTMs running as Active-Standby in a traffic group. Both the LTMs have trunks configured from a switch.   What will happen when all the interface in the trunk fails ...
application delivery
BIG-IP
LTM
  • swjo_264656's avatar
    swjo_264656
    Mar 30, 2018

    Hi

     

    You should setup HA-GROUP if you track trunk interface.

     

    HA-GROUP setup should be on each of your device(Active and Standby)

     

    HA-GROUP configuration isn`t syncable feature.

     

    please refer to it.

     

swjo_264656's avatar
swjo_264656
Icon for Cirrostratus rankCirrostratus
Mar 30, 2018

Hi

 

You should setup HA-GROUP if you track trunk interface.

 

HA-GROUP setup should be on each of your device(Active and Standby)

 

HA-GROUP configuration isn`t syncable feature.

 

please refer to it.

 

  • Krishna_251070's avatar
    Krishna_251070
    Icon for Nimbostratus rankNimbostratus
    Mar 30, 2018

    Thanks swjo!

     

    I have one more follow up query. If configure both LTMs with HA groups, how often they compare the weight of their HA group to find who got the better metric and if it needs traffic failover?

     

  • swjo_264656's avatar
    swjo_264656
    Icon for Cirrostratus rankCirrostratus
    Mar 31, 2018

    I can`t answer your question very accurately.

     

    but BIGIP system with HA pair, always check peer device`s Active-Standby status.

     

    When one`s peer goes Active to standby, immediately goes Active.

     

    For my experience, failover configuration via HA-GROUP have no delay.

     

    If you see /var/log/ltm and when interface down, immediately calculate HA Score

     

    and failover event occurs.