Applies To:Show Versions
- 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0
Introduction to BIG-IP Service Function Chaining
Introducing Service Function Chaining
Components of a service function chain
- Service Classifier Function (SCF)
- A node responsible for matching traffic flows against policies, specifying the chain, and inserting the Network Service Header (NSH) encapsulation.
- Service Function Forwarder (SFF)
- A node responsible for forwarding traffic to one or more connected service functions, according to information carried in the NSH encapsulation. An SFF also handles traffic coming back from a service function.
- Service Function (SF)
- A function responsible for specific treatment of received packets.
Service function chaining models
- Causes downtime
- Is prone to errors
- Results in a topology that is still static
- Unlimited 4G LTE data plan
- Parental control
A network without SFC
- Traffic passes through all nodes, whether the service is purchased or not by the customer.
- Each service node must identify the customer and the services purchased, whether the service is to be applied or not. This results in redundant work for the service node.
- Even when the service is not applied, system resources are still consumed.
A network with SFC
- The orange line denotes the traffic flow for customers who purchased parental control only.
- The blue line denotes the traffic flow for customers who didn’t purchase any service (the parental control or the unlimited data plan).