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Munney_64889's avatar
Munney_64889
Icon for Nimbostratus rankNimbostratus
Aug 20, 2017

GTM sync group and prober pool

Hi guys - couple questions about a new GTM sync group I'm setting up.

 

  1. We have 4 GTMs. Do I need to do a gtm_add from every device to every device in a full mesh? ie. 1-2, 1-3, 1-4....2-3, 2-4....3-4. Thinking if they're establishing trust with each other would need to.

     

  2. Prober pools. We have 2 sites - LA and NYC. I'd like the LA GTMs to probe their local LTMs and the NYC GTMs to probe their local LTMs. I thought prober pools would allow that? There's no way our LA GTMs are going to be able to go over the Internet and try to probe a bunch of LTMs on our internal network in NYC and vice versa...

     

Thanks!!

 

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BIG-IP DNS
  • gsharri's avatar
    gsharri
    Icon for Altostratus rankAltostratus
    Aug 22, 2017
    1. I'm not 100% sure on this but I think simply running gtm_add on a new gtm to join an existing sync group will result in all the gtms trusting each other. Shouldn't need to run on every gtm.
    2. I assume when you say "probe" you are referring to health monitors and not LDNS probes (they are very different). By default the monitors are always run by a bigip in the local DC. In other words your LA gtms would NOT be monitoring the NYC ltms and vice-versa. Prober pool does allow you to select which bigips do the monitoring in a DC so if you would like to have some control over it do that but shouldn't be necessary.

    Scott

     

  • Vijay_E's avatar
    Vijay_E
    Icon for Cirrus rankCirrus
    Aug 22, 2017

    1. You just have to configure 1 GTM and then use its IP as reference when adding other new GTM devices. No need to add it to all existing GTM devices.

       

    2. Why are you using prober pools ? You can rely on the status of the VS in the LTM that is advertised in the GTM mesh. Also, are you using HA pair GTM in each DC ?