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Forum Discussion

SergioPontes_36's avatar
SergioPontes_36
Icon for Nimbostratus rankNimbostratus
Sep 04, 2018

F5 GTM+LTM for Data Center Backup

I would like to better understand the implementation of an environment where there are already two BigIPs (Active / Standby) in a Data Center with the LTM + DNS (GTM) modules. In this topology will...
application delivery
BIG-IP DNS
LTM
PeteWhite's avatar
PeteWhite
Icon for Employee rankEmployee
Sep 05, 2018

This is a fundamental function for GTM.

 

In terms of architecture, the GTM will talk to the LTMs in both datacentres to check the state of the virtual servers. Within GTM, these virtual servers are setup as pools which are assigned to a Wide IP and can be configured in different loadbalancing algorithms - active/standby ( Global Availability ) , Round Robin, closest geographical datacentre etc.

 

When a user wants to access an application, it makes a DNS request to the GTM system which looks at which pools are up or down and makes a loadbalancing decision. It then sends back the DNS response pointing to the IP address in the relevant datacentre.