Nokia service model

The 7705 SAR-Hm series of routers is deployed at the customer provider edge (PE). Services are provisioned on the router in order to facilitate the transport of communications data across an IP/MPLS network using the Ethernet or wireless interfaces available on the node. The data is formatted so that it can be transported in encapsulation tunnels created using Layer 3 generic routing encapsulation (GRE) MPLS.

The Nokia service model has four main logical components, referred to as (logical) service entities. The entities are: applications, service types, service access points (SAPs), and service destination points (SDPs) (see Service entities). In accordance with the service model, the operator uses the (logical) service entities to construct an end-to-end service. The service entities are designed to provide a uniform, service-centric model for service provisioning. This service-centric design implies the following characteristics.

• Multiple services can be bound to a single application.

• Multiple service types can be bound to a single tunnel.

• Tunnel configurations are independent of the services they carry.

• Changes are made to a single service entity rather than to multiple ports on multiple devices. It is easier to change one tunnel rather than several services.

• The operational integrity of a service entity (such as a service tunnel or service endpoint) can be verified by one operation rather than through the verification of dozens of parameters, thereby simplifying management operations, network scalability, and performance.

• A failure in the network core can be correlated to specific subscribers and services.

• The following policies are applied to various services:

  • QoS policies

  • filter policies (IP and MAC)

Additional properties can be configured for bandwidth assignments and class of service on the appropriate entity.