Ethernet Switch Continuity Check Session Interval Optimization
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Solution Overview
Problem
Smaller-scale Ethernet switches, such as Customer Premises Equipment (CPE) switches, face challenges in handling a large number of short interval Continuity Check (CC) sessions due to processor intensity, making it difficult to detect faults within 50ms, whereas larger switches can handle thousands of such sessions efficiently. Adding processing power is not feasible due to cost concerns.
Innovation Solution
Implementing a Continuity Check protocol optimization method that operates multiple CC sessions with a peer switch by setting N sessions to a short interval and M sessions to a long interval, allowing switching and interval exchange between active and backup paths, enabling fast fault detection without affecting service. This method includes configuring CC sessions as Bidirectional Forwarding Detection (BFD) or Connectivity Fault Management (CFM) sessions within Label Switched Paths (LSP) tunnel groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If smaller-scale Ethernet switches operate multiple short interval CC sessions to detect faults within 50ms, then fault detection speed is improved, but processor intensity increases making it infeasible due to cost concerns
Solution Approach 1:
The patent implements dynamic adjustment of CC session intervals, allowing the switch to operate N sessions at short intervals (≤10ms) for fast fault detection while M sessions operate at long intervals (≥100ms). This dynamic interval management enables the switch to adapt processing intensity based on actual network conditions and session priorities, resolving the contradiction between fast detection and processor load
Solution Approach 2:
The patent changes the time interval parameter of CC sessions from a fixed short interval to a variable interval system. By switching between short interval (for active connections requiring fast detection) and long interval (for backup or less critical connections), the system achieves 50ms fault detection capability while keeping processor intensity manageable through parameter optimization
2Quantity of substance
If smaller-scale Ethernet switches increase processing power to handle more short interval CC sessions, then the number of sessions that can be handled is improved, but cost increases making it infeasible
Solution Approach 1:
The patent optimizes the time interval parameter of CC sessions to maximize the number of sessions that can be handled within existing processor capabilities. By using long intervals for non-critical sessions and short intervals only where necessary, the system achieves efficient utilization of limited processing resources without requiring additional hardware investment
Solution Approach 2:
The patent applies partial action by using short interval CC sessions only for critical active connections (N sessions) while using long interval sessions for backup and less critical connections (M sessions). This selective approach ensures fast fault detection where needed while minimizing overall processor intensity, allowing smaller switches to handle more sessions without increasing cost
3Reliability
If protection is implemented with two CC sessions per connection, then reliability is improved, but the number of sessions that can be handled by smaller switches decreases
Solution Approach 1:
The patent applies different quality levels to different sessions: N sessions (active connections) operate at short intervals with high monitoring quality for fast fault detection, while M sessions (backup connections) operate at long intervals with reduced monitoring quality. This local differentiation allows protection to be implemented where critical while reducing overall session count to match smaller switch capabilities
Solution Approach 2:
The patent implements dynamic session management where the interval of protection sessions can be switched based on whether the connection is active or in backup state. When a backup session becomes active, its interval dynamically changes from long to short, ensuring that at any time only the necessary number of short interval sessions are active, thus maintaining reliability while managing session quantity
Data Source
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AI summary
A Continuity Check (CC) protocol optimization method in a switch includes operating a plurality of CC sessions with a peer switch, wherein, for CC intervals, N sessions of the plurality CC sessions are set to a short interval and M sessions of the plurality of CC sessions are set to a long interval, wherein N and M are integers; switching a first session of the N sessions with a second session of the M sessions based on one of a fault and user provisioning; and exchanging the CC intervals between the first session and the second session subsequent to the switching.