Auto-Attach Server CFM Extension for SPBM Network Visibility
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Solution Overview
Problem
Conventional Shortest Path Bridging (SPB) and Connectivity Fault Management (CFM) environments lack the ability to easily identify how Service Instance Identifiers (I-SIDs) are created and which devices are using them, especially in scenarios where devices attach via Auto-Attach, making it difficult for administrators to debug misconfigurations and detect rogue devices.
Innovation Solution
An extension to CFM is introduced that allows an Auto-Attach server to receive requests, respond with information about itself, and provide details on connected Auto-Attach clients and proxies, using TLVs to encode data about client/proxy devices, enabling network administrators to visualize all entities using a given I-SID and detect rogue devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices attach via Auto-Attach to SPBM network, then network connectivity and service access are improved, but visibility and debugging capability for network administrators deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where Auto-Attach servers respond to CFM requests with information about I-SID usage and attached devices. This allows network administrators to receive feedback about network state without disrupting the automatic attachment process, resolving the contradiction between automated device attachment and administrative visibility.
Solution Approach 2:
The patent uses CFM (Connectivity Fault Management) as an intermediary mechanism to bridge the gap between Auto-Attach devices and network administrators. CFM requests and responses serve as the mediator that carries visibility information back to administrators without interfering with the underlying Auto-Attach connectivity functionality.
2Reliability
If CFM requests are sent to trace network paths, then fault detection capability is improved, but the ability to identify Auto-Attach specific information deteriorates
Solution Approach 1:
The patent merges traditional CFM fault detection functionality with Auto-Attach specific information gathering. The same CFM request/response mechanism carries both general network path information and specific Auto-Attach information such as I-SID creation details and device attachment status, eliminating the need for separate mechanisms.
Solution Approach 2:
The CFM response mechanism is designed to be universal, serving multiple functions simultaneously: it provides traditional fault detection data, I-SID usage information, Auto-Attach device identification, and service instance details. This multi-functionality resolves the contradiction by making a single mechanism capable of delivering diverse information types.
3Measurement precision
If network administrators manually check each device for I-SID usage, then complete visibility is achieved, but time consumption and operational complexity increase
Solution Approach 1:
The patent implements self-service where Auto-Attach servers automatically provide information about their attached devices and I-SID usage when queried via CFM. Instead of requiring administrators to manually check each device, the system enables administrators to request information and receive comprehensive responses automatically, dramatically reducing debugging time while maintaining complete visibility.
Data Source
AI summary
A computer-implemented method, apparatus and software for debugging auto-attach entities is presented. A Continuity Fault Management (CFM) request for a service is received over a network at an Auto-Attach (AA) server. The AA server responds with a first response regarding the AA server on the service. The AA server also responds to the CFM request with a second response regarding any AA clients and any AA proxies on the service.