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Daud's avatar
Daud
Icon for Nimbostratus rankNimbostratus
Jan 09, 2020

BIG IP DNS VIRTUAL SERVER SWITCHOVER

Hey guys,

 

I have two Data centers, each with 1 BIG-IP DNS/GTM and a pair of LTM. The GTM are set in a synch group, and two pools (one per DC) and 3 VS per pool.

 

Scenario: lets say the LDNS/client sends a request to the GTM for test1.com and the GTM picks pool1 and then VS1. Respond with test1.com is 1.1.1.1. The LDNS/client will have this entry in its cache.

 

Question: what happens when if VS1 goes down but the client still has that entry in its cache? Is there a way the GTM can update the client? Or does the GTM fails over the connection?

 

application delivery
BIG-IP DNS
gtm

1 Reply

  • Lidev's avatar
    Lidev
    Icon for Nacreous rankNacreous
    Jan 09, 2020

    Hi Daud,

     

    You can play with the TTL on the GTM to limit the outage, check here how to proceed

     

    Regards