Temporal LSP Resource Reservation in SDN
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Solution Overview
Problem
In SDN networks employing label switched paths (LSPs), resources are inefficiently reserved indefinitely until LSP deletion, even if paths are not actively carrying traffic at all times, leading to suboptimal network resource utilization.
Innovation Solution
A temporal tunnel service (TTS) controller is used to create temporal LSPs for specific time intervals, reserving network resources only when needed, and releasing them upon completion, allowing for efficient allocation and deallocation of resources based on user requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LSPs are created to ensure network connectivity and resource availability, then network reliability is improved, but network resource utilization deteriorates because resources are reserved indefinitely even when not actively carrying traffic
Solution Approach 1:
The patent applies dynamics by transitioning LSPs from a static permanent state to a dynamic temporal state. LSPs are now created with specific time intervals (start time and end time) and can be automatically established and torn down based on temporal requirements. This allows network resources to be dynamically allocated only when needed, improving utilization while maintaining reliability during active periods
Solution Approach 2:
The patent implements periodic action through recurring LSPs that can be scheduled to repeat at regular intervals. The system supports configuring LSPs with period values, allowing them to be automatically re-established after teardown based on temporal patterns. This enables resources to be reserved periodically rather than continuously, reducing waste while ensuring availability during required time windows
2Ease of operation
If LSPs are maintained permanently to ensure immediate traffic forwarding capability, then ease of operation is improved, but device complexity increases due to continuous resource reservation management
Solution Approach 1:
The patent applies self-service by enabling LSPs to automatically establish and teardown based on their configured temporal parameters without requiring manual intervention. The system autonomously manages the lifecycle of LSPs, creating them at specified start times and tearing them down at end times, or automatically re-establishing them according to recurring patterns. This reduces operational complexity while maintaining immediate forwarding capability when LSPs are active
3Adaptability or versatility
If network resources are reserved for all LSPs indefinitely, then network scalability is limited, but flexibility in resource allocation deteriorates
Solution Approach 1:
The patent enhances both flexibility and scalability through dynamic temporal LSP management. By allowing LSPs to be created, modified, and torn down based on temporal requirements, the system can flexibly allocate resources to different LSPs at different times. This enables better resource utilization across multiple LSPs, improving overall network scalability while maintaining allocation flexibility
Solution Approach 2:
The patent applies parameter changes by introducing temporal parameters (start time, end time, period) to LSP configurations. These parameters enable the system to adapt resource allocation dynamically based on time-of-day, day-of-week, or recurring patterns. This allows the network to scale more effectively by allocating resources to different LSPs at different temporal intervals, improving both flexibility and productivity
Data Source
AI summary
A method implemented by a temporal tunnel service (TTS) controller, comprising computing a path in a network for a temporal label switched path (LSP), wherein the path satisfies a network constraint in a time interval comprising a predetermined start time and a predetermined end time, reserving, at a current time prior to the predetermined start time, a network resource along the path computed for the temporal LSP, wherein the network resource is reserved for the temporal LSP to carry traffic in the time interval, and creating the temporal LSP in the network by sending a route configuration instruction to each node along the path of the temporal LSP.