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Joann_D_'s avatar
Joann_D_
Icon for Nimbostratus rankNimbostratus
Oct 04, 2016

GTM Dynamic Ratios with LTM Virtual Servers

This is the first question I've been asked by an application team for which I could not find an answer on Dev Central, so I hope someone can assist.

 

We have two data centers, GTM monitors 1 VS in each DC.

 

  • VS1 in DC1 has two nodes
  • VS2 in DC2 has one node
  • Application team wants 99% of traffic to VS1 and 1% of traffic to VS2 (no problem, can use ratios)

If one node goes down for VS1, is there any way to dynamically have GTM send 50% of traffic to VS1 (one remaining node) and 50% of traffic to VS2? I know this can be done manually by changing the ratios, but is there a way to have it done automatically?

 

Thanks in advance for any ideas!

 

application delivery
BIG-IP
BIG-IP DNS

3 Replies

  • Shaun_Simmons1's avatar
    Shaun_Simmons1
    Icon for Altostratus rankAltostratus
    Oct 04, 2016

    To Clarify --

     

    A single GTM has an A record for VS1 and VS2.

     

    --Note: In your explanation you say GTM sending traffic. To understand; traffic does not flow through the GTM. The GTM just serves DNS records.

     

    You need to center your thoughts around the LTM and using a Ratio / iRule to do the magic. Writing an iRule is out of my realm. ha! I'm a script kiddie. :) I will still try and research this for you! --Others may chime in, with a quicker answer.

     

    --Jason Rahm may be the best dude to help answer your question. He has answered a question or two like yours. Here is one "like" yours: https://devcentral.f5.com/s/feed/0D51T00006i7TVbSAM

     

  • Joann_D_'s avatar
    Joann_D_
    Icon for Nimbostratus rankNimbostratus
    Oct 04, 2016

    Thanks, Shaun. I will take a look at the link you provided. I appreciate the feedback!