BIG-IP uses avirtual server matching and precedence algorithmto determine which virtual server processes an incoming connection. This decision is made entirely in thedata planeand is based on how specifically a virtual server matches the destination IP address and port.
BIG-IP Virtual Server Selection Rules (Simplified):
When multiple virtual servers could match a packet, BIG-IP selects themost specific match, using the following precedence:
Exact IP address and exact port
Exact IP address with wildcard port (port 0 / any)
Wildcard IP address with exact port
Wildcard IP address and wildcard port
Applying the Rules to This Scenario:
Incoming traffic destination:1.0.0.10:8080
Option C: 1.0.0.10:8080
Exact IP match
Exact port match
Highest possible specificity
If the virtual server is available (green), itwins the match
Option B: 1.0.0.10:any
Exact IP match, but wildcard port
Lower priority than an exact IP + exact port match
Option D: 0.0.0.0:8080
Option A: 0.0.0.0:any
Wildcard IP and wildcard port
Lowest priority, used only if no more specific virtual server exists
Final Determination:
Because a virtual server configured withdestination 1.0.0.10:8080exactly matches both the IP address and port of the incoming connection—and is available—it willalwaysbe selected to process the traffic.
Key Data Plane Concept Reinforced:
BIG-IP always processes traffic using themost specific matching virtual server. Exact destination IP and port matches take precedence over any wildcard or forwarding virtual server definitions.
===========
