health probes are not manditory, but they do give you a better way of determining if your servers are truly healthy.
I noticed without probes being configured, when a server was shutdown, it was reported as failed in the CSM. I did some packet captures to see what the default health probe was. I knew the CSM had some way of detecting a downed server. I found that ARP is used by default when a probe is not configured and applied to the serverfarm. When the CSM doesn't receive ARP replies from the server, it lists it as failed.
If you have a web server with a stopped web service, as long as the server can respond to ARP requests, the CSM will continue to send user traffic to it. A properly configured HTTP probe would be able to detect this and take the server out of service.
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Join us live on Thursday, April 8 at 10 am PT (and on demand after) where Cisco and HashiCorp executives will discuss the importance of IaC automation, Cisco Intersight Service for Hashicorp Terraform, and how to better manage hybrid cloud infrastructure...
How to START with Infrastructure as a code for Cisco Cloud Solutions
ACI Ansible Modules Documentation Guide
Cisco Collections on Ansible Galaxy
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DevNet Introduction to ACI and Ansible
DevNet Introduction to ACI a...
Here's how to get notified about Cisco software releases, like the Application Policy Infrastructure Controller (APIC) (APIC Software)
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