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Pirlo's avatar
Pirlo
Icon for Nimbostratus rankNimbostratus
Aug 23, 2017

GTM Topo Failure

I have GTM Topolgy failover scenario I am trying to get working and cannot identify proper solution.

 

The below configuration works as expected

 

WIP Configured as Topolgy with 3 pools and works with Continent to Pool Configuration = All Weights 100 Pool New York (RR 2 Members) = North America, South America and Oceania Pool London (RR 2 Members) = EMEA and Africa Pool Singapore (RR 2 Members) = APAC

 

What I am trying to do is configure a failover pool if New York Goes down to pass traffic to Standby DC in Phoenix until New York comes back online.

 

All configurations that I have tried are failing. Does anyone know of a way to configure the Phoenix pool as a Standby for New York so that when New York goes down all North America, South America and Oceania traffic route to Phoenix?

 

Is it a topo record that needs to be configured with weight after New York or some configuration in New York pool to add Phoenix?

 

I was hoping it would be as easy as a priority group in New Your pool with Phoenix servers. But I guess priority on GTM doesnt operate like LTM does.

 

Any assistance would be appreciated.

 

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BIG-IP DNS
  • gsharri's avatar
    gsharri
    Icon for Altostratus rankAltostratus
    Aug 23, 2017

    Try this config. I think this will do what you want:

     

    1. NY pool. LB methods preferred: RR, alternate: none, fallback: none
    2. Phx pool.LB methods preferred: RR, alternate: your_choice, fallback: your_choice
    3. Assign pools to wideip. Wideip LB method: topology
    4. Custom topology region containing NA, SA, Oceania
    5. Topology record NA,SA,O > NY pool, weight 100
    6. Topology record: NA,SA,O > Phx pool, weight 50
    7. GTM will select the matching record with the highest weight (NY pool) but if all NY members are unavailable and alt/fallback LB methods=none it will then move on to a matching record with a lower weight (Phx pool).
    8. When NY is available again name resolution will resume to NY but you can set manual resume on the NY pool so GTM doesn't switch back automatically.