Segment Protection Group for TESI Rerouting
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Solution Overview
Problem
In Provider Backbone Bridged Networks (PBBN), Traffic Engineered Service Instances (TESI) face forwarding ambiguity and bandwidth wastage due to the need to retrace paths when communication failures occur across tandem infrastructure segments, leading to inefficient rerouting.
Innovation Solution
The implementation of Segment Protection Groups (SPGs) that identify and switch TESI traffic over high-priority protection infrastructure segments, preventing forwarding ambiguity and retracing by pre-provisioning forwarding entries in intermediate bridges and using Continuity Check Messages to manage network failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TESI is rerouted over backup infrastructure segment when communication failure occurs, then network reliability is improved, but forwarding ambiguity and path retracing cause bandwidth wastage and increased switching time
Solution Approach 1:
The patent pre-provisions forwarding entries in the forwarding database for both work and protection infrastructure segments before failures occur. When a failure is detected, the bridge can immediately switch to the pre-configured protection path without recalculating routes, eliminating path retracing and reducing switching time while avoiding bandwidth wastage from ambiguous forwarding decisions
2Adaptability or versatility
If TESI forwarding entry is maintained on multiple ports of a bridge, then routing flexibility is improved, but forwarding ambiguity occurs during failure scenarios
Solution Approach 1:
The patent segments the protection switching decision-making process by introducing a specific bridge (bridge 6) that acts as a dedicated protection switching point. This bridge maintains forwarding entries for both work and protection segments but uses a明确的 selection mechanism to choose only one active path at a time, eliminating forwarding ambiguity while preserving routing flexibility through the segmented architecture
3Reliability
If protection infrastructure segment is used for rerouting, then network resilience is improved, but path retracing increases switching time
Solution Approach 1:
The system pre-provisions forwarding entries for protection infrastructure segments in advance, so when a failure occurs, the bridge can immediately activate the pre-configured protection path without needing to recalculate or retrace the route. This eliminates the time penalty associated with dynamic path reconstruction during failure scenarios
Data Source
AI summary
A network topology including at least one protection infrastructure segment for each work infrastructure segment, such that the work infrastructure segment and the corresponding protection infrastructure segment terminate on the same nodes, wherein the two protection infrastructure segments pass through at least one bridge node, monitoring for failure in the work and protection infrastructure segment in the network, switching Traffic Engineered Service Instance (TESI) over high priority protection infrastructure segment, and provisioning two SPG of co-joint node to prevent infrastructure segment from forwarding ambiguity and retracing of the TESI.