Inter-Chassis Peer LSP Number Planning for Automatic Discovery
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Solution Overview
Problem
In inter-chassis devices using the IS-IS protocol, there is no automatic discovery mechanism for peers, leading to manual configuration of addresses and potential confusion among peers when announcing themselves, which complicates network management and can result in undetermined link status databases.
Innovation Solution
A method where peers in an inter-chassis device generate and transmit Link State Protocol Data Units (LSPs) with unique number ranges that do not overlap, allowing peers to automatically discover each other by comparing LSP numbers and SOURCE ID fields, eliminating the need for manual address configuration and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual configuration of peer addresses is used in inter-chassis devices, then peers can be configured to communicate, but network management complexity increases and automation is reduced
Solution Approach 1:
The system enables self-service by allowing peers to automatically discover each other through LSP number comparison and SOURCE ID field matching, eliminating the need for manual address configuration. Each peer independently identifies others in the inter-chassis device by comparing received LSP numbers against its own assigned range and verifying SOURCE ID fields.
2Reliability
If peers use the same LSP number range, then configuration is simpler, but LSP conflicts occur causing undetermined link status databases
Solution Approach 1:
The LSP number space is segmented into distinct non-overlapping ranges assigned to different peers within the inter-chassis device. This segmentation prevents LSP conflicts by ensuring each peer operates in its own numbered domain, while the standardized comparison mechanism maintains operational simplicity.
Solution Approach 2:
Each peer is assigned a specific local quality (unique LSP number range) that distinguishes it from other peers. This local differentiation through numbered ranges allows reliable identification and conflict prevention while maintaining overall system coherence through the standardized discovery protocol.
3Productivity
If peers independently announce themselves without synchronization, then automation improves, but LSP number conflicts may arise
Solution Approach 1:
Preliminary action is taken by pre-assigning non-overlapping LSP number ranges to each peer before they begin independent operation. This preliminary configuration ensures that when peers independently announce themselves without synchronization, LSP number conflicts cannot occur because each peer operates within its pre-designated numerical domain.
Data Source
AI summary
The disclosure relates to a method of LSP number planning in an inter-chassis device comprising a plurality of peers. In one embodiment, the method comprises steps of generating an LSP and transmitting the generated LSP outside at a peer. The LSP number in the generated LSP is a number in a number range assigned to that peer. The number ranges assigned to different peers of the inter-chassis device do not overlap with each other. By the LSP number planning method, the peer may discover automatically other peers in the same inter-chassis, and announce itself independently.