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Karim's avatar
Karim
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Jan 22, 2017

GTM Load balancing default settings

Hello everyone,

 

If I understand it well, all parameters in "DNS>> Settings: GLSB : Load Balancing" page set the defaults settings for subsequently created pools (from "Configuring BIG-IP GTM" book. chapter 6, page 3). However, it doesn't work in my lab :

 

1) In "DNS>> Settings: GLSB : Load Balancing", I disabled the "Verify Virutal Server Availability" option.

 

2) In "DNS ›› GSLB : Pools : Pool List ›› New Pool..." I noticed that "Verify Member Availability" option is enabled by default. shouldn't it be disabled because of my action in 1) ?

 

am I missing something or is it just not the expected behavior ?

 

Lab in version 12.1.1

 

Many thanks for your help,

 

Karim

 

application delivery
BIG-IP
BIG-IP DNS

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  • Alex_104543's avatar
    Alex_104543
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    Jan 25, 2017

    Hi, my understanding of the two settings:

    1) 

    DNS>> Settings: GLSB : Load Balancing > Verify Virtual Server Availability
    <-- This is the global setting. When it is disabled, availability of all VS are not checked & they are available for selection, even if the Verify Member Availability option is enabled in the wideip pool.

    2) 

    DNS ›› GSLB : Pools : Pool List ›› New Pool... > Verify Member Availability
    <-- This setting allows us to overwrite the global setting for a specific wideip pool. E.g. to bypass pool member checking for a specific wideip pool, even though the global setting to verify VS availability is enabled.

    The above are based on my observations. Appreciate if someone could correct me if my understanding is inaccurate.