ice instances wouldn't affect routing in the network, providing flexible service SET. Last but not the least, providing the ability to link together services of different types by enabling new and innovative bundled services. The construction of service consisting of different components in hierarchies includes: Service: A service function, application, or content used in collaboration with other SETs to enable a service. SET Sequence: Predetermined sequence of SETs that form the service using which it gives defined outcomes. Set Sequence Path: Several combinations of Service Nodes that could form part of the SET sequence. The SET sequence path is a list of combinations available that could be used to satisfy the service. With the passage of time, SDN and NFV started using technologies which include PCE and OPENFLOW, using service orchestration. With the introduction of SEP concept, Virtualization techniques began to evolve; making wholesale virtualization of the service plane on COTS - Commercial-Off- The-Shelf wasn't an essential part as it is now with ETSI NFV. In case of MPLS fabric from a prior post, the working of service chaining set of stacked labels onto the packets at the network ingress (such as the first leaf node the packet encounters, or even the edge of the network itself, or at the data center border router). The way that Service chaining works in the case of the MPLS fabric from a prior post, a set of labels is stacked onto the packet at the network ingress (at the data center border router, or the first leaf node the packet encounters, or even the edge of the network itself). The first label is responsible for traffic forwarding to the first service in the chain where it drops its label and thereafter packet is forwarded without label. In the same way, second label is responsible for forwarding packets to the second service and again packet drop its label there. (Rick McGeer, 2013) Downloaded: 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 Virtualizing Network Functio