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luigi_bros's avatar
luigi_bros
Icon for Nimbostratus rankNimbostratus
Sep 08, 2016

Based on what F5 chooses a self-ip (floating or not-floating) for backend connections?

Hello all, I have this question since a while now and maybe it is the time to have this answer :) I am going to migrate the box into a new logic and more clear architecture and there is a step during my migration plan where maybe it would save me time.

 

I did a test by creating a new empty traffic-group (let's call "Traffic-Group-N") and I put on it a VIP object. There is not self-ip on this Traffic-Group-N and I see that the BIG-IP chose a self-ip "traffic-group-local-only" on the same vlan of the backend server.

 

Based on which criterias the BIG-IP chooses a self-ip for backend connections? I have 29 Self-IPs.

 

Thank you.

 

application delivery
BIG-IP

2 Replies

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  • Vijay_E's avatar
    Vijay_E
    Icon for Cirrus rankCirrus
    Sep 08, 2016

    Based on which interface/vlan is selected for the egress traffic. The IP on that interface/vlan is selected.

     

  • ekaleido's avatar
    ekaleido
    Icon for Cirrus rankCirrus
    Sep 12, 2016

    The selfIP of the interface with the best route to the backend host will be chosen. Health checks will come from the non-floating selfIP, where SNAT Automap traffic will come from the floating selfIP.