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David__Pasch's avatar
David__Pasch
Icon for Altostratus rankAltostratus
Jun 02, 2017

Big-Ip DNS - Topology LBing and Return-to-DNS

DevCentral, I absence of a lab to test this, I am posting this question to you. If I have a WIP set up for topology load balancing, with three pools. topo records for:   region 1 to pool ...
application delivery
BIG-IP DNS
Leonardo_Souza's avatar
Leonardo_Souza
Icon for Cirrocumulus rankCirrocumulus
Jun 02, 2017

Forget the topology part for a few seconds.

 

If you had global availability, so pool1 -> pool2 -> pool3 (with return to DNS). If pool1 can't handle the request, the GTM will go for pool2 and not bind. However, if you have return to DNS in pool1, it will go to bind, so never reaches pool2.

 

Now back to topology...

 

If you say to send traffic to pool1 only, and that pool can't handle the traffic, it will not send to pool3. To do that, you have to play with the topology score, and have a record to pool1 and one to pool3.

 

There is also the last resource pool, but that is more for when everything is down.

 

https://support.f5.com/csp/article/K15258