Virtual private cloud need to apply several virtual network functions, such as firewall, load balancer, WAN optimization before accessing internet.
Enterprise will outsource their CPE to service providers that provide cloud based vCPE services. The connection between branch and headquarter need a chained services across the WAN.
- Identify flows to be applied for VNFs. E.g. outgoing flow, incoming flow
- describe connections with chained service functions.
- Apply policies to steer flows to go through different service paths
The intent based service chaining should be topology agnostic, and only express information that users need.