ASON Ethernet Connection Label Negotiation
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Solution Overview
Problem
Current ASON networks lack mechanisms for path computation and virtual topology management, especially for Ethernet connections, and face challenges in label negotiation across multiple nodes, leading to difficulties in establishing and managing connections efficiently.
Innovation Solution
The implementation of an ASON database with synchronized topology and routing information across nodes, along with a path computation algorithm that uses constraints like cost and service class to determine shortest paths, and mechanisms for label negotiation that allow dynamic creation and management of connections without requiring binding and releasing of resources before negotiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual configuration of individual cross-connects on each Network Element is used, then connection establishment is possible, but the process is complex and time-consuming
Solution Approach 1:
The control plane agent automatically performs path computation, cross-connect configuration, and resource allocation without manual intervention. The system self-services by computing optimal paths through the network and automatically provisioning connections based on user-specified parameters (source, destination, bandwidth), eliminating the need for manual cross-connect configuration on each Network Element
Solution Approach 2:
The path computation algorithm pre-calculates optimal routes through the network before connection establishment. The control plane agent prepares path information, resource availability, and routing decisions in advance, so that when a connection request is received, the system can quickly allocate resources and establish the connection without time-consuming manual configuration
2Extent of automation
If control plane automation is implemented, then service provisioning is enhanced, but path computation and virtual topology management mechanisms are lacking
Solution Approach 1:
The control plane is segmented into distinct functional components: path computation module, virtual topology management module, and signaling module. Each component handles specific tasks independently, making the overall complex system manageable through modular design. The path computation algorithm is separated from the connection provisioning logic, allowing independent optimization and implementation
3Productivity
If label negotiation is performed across multiple nodes, then connections can be established, but resource binding and releasing requirements complicate the process
Solution Approach 1:
The label negotiation process implements feedback mechanisms where the control plane agent continuously monitors resource availability and negotiation status across multiple nodes. Resource binding decisions are made based on real-time feedback from the network state, and resource releasing is automatically triggered when connections are established or terminated, simplifying the overall process through automated feedback-driven control
Solution Approach 2:
The control plane agent acts as an intermediary between network nodes during label negotiation. It centralizes the management of resource binding and releasing, coordinating label assignments across multiple nodes without requiring complex direct peer-to-peer negotiations. The intermediary maintains resource state information and manages the binding/releases centrally, reducing the complexity at individual nodes
Data Source
AI summary
Systems and methods for connections on an Automatically Switched Optical Network (ASON) network including an ASON database and path computation algorithm, mechanisms for Ethernet connections over ASON, and mechanisms for label negotiation for SNCs are provided. Advantageously, the present invention provides mechanisms for ASON path computation and virtual topology management, Ethernet connection establishment, modification, and deletion in ASON networks, and label negotiation without requiring binding and releasing of connections before label negotiation.