Pseudo-Node Identifier Transition for IS-IS Network Connectivity
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Solution Overview
Problem
In complex networking environments, maintaining accurate connectivity is challenging due to disruptions caused by loss of connectivity to designated intermediate systems (DIS), leading to traffic flow disruptions and inconsistencies in routing information.
Innovation Solution
The method involves using pseudo-node identifiers generated by network nodes to maintain connectivity by executing network path determination operations and purging identifiers based on predetermined thresholds, ensuring seamless traffic flow even during DIS changes, by utilizing existing IS-IS protocols and maintaining the use of old pseudo-node LSPs until new connectivity information is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If routing protocols are used to manage connectivity in complex networking environments, then routing information can be propagated among network nodes, but windows of information inconsistency occur leading to traffic disruptions and dropped traffic flows
Solution Approach 1:
The system performs preliminary actions by detecting connectivity loss to the first network node before the second network node's pseudo-node identifier is fully propagated through the network. This early detection triggers a controlled transition process that prevents information inconsistency windows, ensuring routing information remains consistent across all nodes during the DIS changeover.
Solution Approach 2:
The system uses the second pseudo-node identifier as an intermediary element that bridges the transition between the first and second network nodes. By introducing this intermediate identifier and managing its propagation timing, the system ensures seamless connectivity maintenance during the DIS change, preventing traffic disruptions while updating routing information across the network.
2Adaptability or versatility
If DIS changes are implemented to maintain network operation, then network adaptability is improved, but traffic flow disruptions occur during the transition period
Solution Approach 1:
The system detects connectivity loss and initiates the pseudo-node identifier transition process before actual traffic disruption occurs. By performing preliminary detection and controlled propagation of the second pseudo-node identifier, the system enables smooth DIS changes without interrupting traffic flows, maintaining both adaptability and productivity.
Solution Approach 2:
The system ensures continuous useful action by maintaining network connectivity throughout the DIS transition process. The controlled propagation and execution of network path determination operations using the second pseudo-node identifier ensure that traffic flows continue uninterrupted, preserving productivity while enabling necessary adaptability through DIS changes.
3Measurement precision
If network path determination operations are executed frequently to maintain accurate routing information, then routing accuracy is improved, but network resource consumption increases
Solution Approach 1:
The system applies partial action by executing network path determination operations selectively rather than continuously. Path determination is triggered specifically when connectivity loss is detected and during the transition period, rather than performing unnecessary operations during stable conditions. This approach maintains routing information accuracy while minimizing network resource consumption by avoiding excessive path determination executions.
Data Source
AI summary
A method is provided in one example embodiment and includes receiving a first pseudo-node identifier associated with a first network node via a network. The first pseudo-node identifier is generated by the first network node in a first designated intermediate system (DIS) operation. The method further includes detecting a loss of connectivity to the first network node, and receiving a second pseudo-node identifier associated with a second network node via the network. The second pseudo-node identifier is generated by the second network node in a second DIS operation. The method further includes executing a first network path determination operation using the first pseudo-node identifier and the second pseudo-node identifier when an elapsed time between the detecting of the loss of connectivity with the first network node and the executing of the first network path determination operation is within a predetermined threshold.