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Angel_Lopez_116's avatar
Angel_Lopez_116
Icon for Altostratus rankAltostratus
Aug 31, 2015

Active HA peer selection

Hi there,

 

I have each HA peer in a data center, linked by a DWDM for the VLAN extension between both data centers. This weekend we had some maintenance tasks on the DWDM, and we got our data centers isolated. As each F5 BIG-IP couldn't see the peer, both got active. When both data centers got linked and both peers started talking between them again, the one that decided to stay as active was the BIG-IP on the backup data center. We'd prefer to have the main datacenter BIG-IP as active and I know that I have the auto failback option, but we aren't using it rith now, so my question is: when auto failback is not in use and both peers got active due to a link lost between them, how is the decision taken of who must be the active one when they start talking again? Is something related to the management IP or MAC address? (greater IP prefered).

 

Thanks.

 

application delivery
deployment
LTM
management
TMOS

1 Reply

  • FredMasson_3063's avatar
    FredMasson_3063
    Icon for Nimbostratus rankNimbostratus
    Aug 31, 2015

    hello, With HA-LTM in v10, you can choose "redundancy mode"=Active/backup , and specify the state preference, but is a preference , and not a preempt status.

     

    Doc: " When a standby unit becomes active, it normally remains active until an event occurs that requires the other unit to become active again, or until you specifically force it into a standby state."

     

    in your situation , i force the state of the unit.

     

    fred