NimbostratusThis may be a basic question. Trying to understand why Service Port is required to be configured while defining a member within a Wide IP Pool. As per my understanding GTM is more of DNS based operation and Service Port is redundant information. Can some please help me to understand this
Thanks, sha
CirrocumulusLet me see if I can take a crack at this.
The BIG-IP GTM typically uses 1 or more Virtual Servers ( IP and port, even if the port is 0) whether BIG-IP or anything else as part of the GTM decision tree to decide on how to respond to a DNS based question. There are ways to use GTM to respond with a simple IP address, but in my opinion a lot of the real power that comes from GTM is from the health monitoring aspect of the product.
If you want the GTM to utilize the monitors for a virtual server in the GTMs decision making process you need an IP and service port for the service the GTM is monitoring.
CirrusHow if I have 1 IP but with 2 or more TCP service ports?
When I create a GTM Wide IP Pool, I need to choose one port but this causes some problems, here's an example:
Say I have 10.1.0.100 and my LTM has port 80 and port 443. If I add 10.1.0.100 : 443 as a pool member in the GTM, then should port 80 fail - the GTM wouldn't know because the GTM is only receiving information about 443 from the LTM. And conversely, if port 443 fails - the GTM will mark 10.1.0.100 as unavailable even when port 80 is still up.
How do I get the GTM to not mark the IP as unavailable if there are still other service ports up?