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Nicholas_386702's avatar
Nicholas_386702
Icon for Nimbostratus rankNimbostratus
Mar 22, 2019

VLAN Self IP vs Floating IP

I've tried searching for some of this information but haven't really found a good answer.

 

From what I've found, VLAN's require an IP, but I haven't found anything saying if it can be just a floating IP, or if you have to have a static IP as well? And are you able to set multiple floating IP's? If so, what is the maximum?

 

Thanks!

 

application delivery
BIG-IQ
TMOS

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  • Morten_Marstran's avatar
    Morten_Marstran
    Icon for Nimbostratus rankNimbostratus
    Mar 22, 2019

    Hi, Not sure if this answers your question, but you have to have a single non-floating IP per VLAN. If you use High Availability, you can add Floating IP's as well, and they are used as cluster IP's, much like Cisco HSRP.

     

    • Nicholas_386702's avatar
      Nicholas_386702
      Icon for Nimbostratus rankNimbostratus
      Mar 22, 2019

      Thank you! That does answer my question! Do you happen to know also how many floating IP's you can assign per VLAN?

       

  • Morten_Marstra1's avatar
    Morten_Marstra1
    Icon for Cirrus rankCirrus
    Mar 22, 2019

    Hi, Not sure if this answers your question, but you have to have a single non-floating IP per VLAN. If you use High Availability, you can add Floating IP's as well, and they are used as cluster IP's, much like Cisco HSRP.

     

    • Nicholas_386702's avatar
      Nicholas_386702
      Icon for Nimbostratus rankNimbostratus
      Mar 22, 2019

      Thank you! That does answer my question! Do you happen to know also how many floating IP's you can assign per VLAN?

       

  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    Mar 22, 2019

    Hi Nicholas,

     

    I don't see why you couldn't but why you need to set multiple self IP or floating IP? everything depends what you want to do.

     

    case1 (standalone):

     

    • 1 static IP (all outgoing traffic pass trough this static IP)

    case2 (standalone):

     

    • 1 static IP (This IP will be use by monitoring only)
    • 1 floating IP (all outgoing traffic pass trough this floating IP)

    case3 (cluster) - Active - Standby:

     

    • 1 static IP per member
    • And 1 shared floation IP (Traffic group 0)

    case4 (cluster) - Active - Active:

     

    • 1 static IP per member
    • And 1 shared floation-a IP (Traffic group 0) Priority on member 1
    • And 1 shared floation-b IP (Traffic group 1) Priority on member 2

    case 5 - Multiple statique self-IP on the same VLAN with different subnet...

     

    tell me exactly what you want to do and I can help you.

     

    Regards

     

  • Dylan_375544's avatar
    Dylan_375544
    Icon for Cirrocumulus rankCirrocumulus
    Mar 22, 2019

    A self-ip is for each individual device to communicate from in each VLAN. A floating IP "floats" to the active unit.

     

    HERE is a good DevCentral post on the topic, and HERE is some F5 documentation on the topic!

     

    Hope that helps! If it does please up-vote and select this answer, it would be greatly appreciated!

     

    -Dylan