Auto Attach Server ISID VLAN Mapping Recovery
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Solution Overview
Problem
In network configurations using Shortest Path Bridging (SPB) and Auto Attach technologies, temporary errors during configuration can lead to rejected Service Identifier/Virtual Local Area Network (ISID/VLAN) mappings, causing network traffic non-convergence as there is no immediate mechanism for resending mappings once the error is resolved.
Innovation Solution
The Auto Attach Server (AAS) sends a Link Layer Discovery Protocol (LLDP) request to the Auto Attach Client (AAC) to resend ISID/VLAN mappings after a recovery event, allowing the AAS to validate and establish network traffic for previously rejected mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ISID/VLAN mappings are rejected during configuration due to temporary errors, then configuration stability is maintained, but network traffic convergence is delayed
Solution Approach 1:
The system performs preliminary validation of ISID/VLAN mappings before final configuration commitment. When temporary errors are detected, the mapping requests are held in a pending state rather than immediately rejected, allowing for automatic retry attempts once errors are resolved, thus preventing permanent configuration failures while maintaining stability.
Solution Approach 2:
The system implements a feedback mechanism where rejected mapping requests are tracked and automatically resent after error resolution. The network device monitors the status of previously rejected mappings and triggers automatic resubmission when temporary errors are cleared, enabling continuous configuration improvement without manual intervention and reducing convergence time.
2Ease of operation
If mapping requests are immediately rejected without retry mechanism, then configuration error handling is simplified, but network convergence efficiency deteriorates
Solution Approach 1:
The system implements self-service functionality where the network device automatically detects temporary errors, tracks rejected mapping requests, and resubmits them without manual intervention. This self-healing mechanism maintains configuration simplicity while improving convergence efficiency, as the system autonomously handles error recovery without requiring complex manual error handling procedures.
Solution Approach 2:
The system dynamically changes the state of mapping requests from 'rejected' to 'pending retry' based on error type detection. By modifying the status parameter of failed mappings, the system enables automatic resubmission for temporary errors while maintaining simple rejection handling for permanent errors, thus balancing operational simplicity with convergence efficiency.
Data Source
AI summary
Examples disclosed herein relate to a method comprising transmitting an ISID VLAN mapping request including a first plurality of ISID VLAN mappings and rejecting a first ISID VLAN mapping belonging to the plurality. The method comprises performing a recovery event, transmitting a mapping request message to the AAC in response to the recovery event and transmitting a second plurality of ISID VLAN mappings including the first ISID VLAN mapping. The method comprises validating first ISID VLAN mapping; and establishing network traffic between the AAS and the AAC for the first ISID VLAN mapping.