Dynamic Segment Routing in Multi-Domain Networks
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Solution Overview
Problem
Current methods for using Segment Routing in multi-domain networks require preconfiguration of paths through the server network, leading to inefficient use of resources as network resources must be pre-allocated, which is not necessary in a connection-oriented client network domain.
Innovation Solution
Assigning a network segment identifier to potential paths between overlay network nodes in the client network domain, allowing data packets to indicate a preselected path for routing without preconfiguration, thus enabling efficient use of client network resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paths through the server network are preconfigured, then reliable routing is ensured, but network resources are inefficiently used due to pre-allocation
Solution Approach 1:
The patent makes the path configuration dynamic by allowing overlay network nodes to request path setup on-demand through the GMPLS UNI control plane. Instead of static preconfiguration, paths are established dynamically when needed, allowing network resources to be allocated flexibly based on actual traffic requirements while maintaining routing reliability through controlled path setup and teardown operations.
2Reliability
If manual preconfiguration of paths is performed, then path establishment is reliable, but device complexity and operational effort increase
Solution Approach 1:
The patent enables overlay network nodes to autonomously request and establish paths through the server network domain using the GMPLS UNI control plane interface. Instead of requiring manual operator intervention for path configuration, the system allows automated on-demand path setup where overlay nodes serve their own configuration needs by submitting path requests with appropriate parameters, reducing operational complexity while maintaining reliability.
3Reliability
If preconfiguration is used to ensure path availability, then service reliability is improved, but adaptability to changing network conditions deteriorates
Solution Approach 1:
The patent implements dynamic path configuration that adapts to changing network conditions by allowing overlay network nodes to request new paths on-demand. The system can respond to varying traffic patterns and network states by establishing or tearing down paths as needed through the GMPLS UNI control plane, providing both service availability through controlled path management and adaptability to changing conditions through flexible on-demand provisioning.
Data Source
AI summary
The present invention provides a method for enabling Segment Routing in a multi-domain network comprising a client network domain and a server network domain, where the client network domain is a packet network domain and the server network domain is a connected-oriented network domain. The method comprises assigning a network segment identifier to each of one or more potential paths through the server network domain between a pair of overlay network nodes in the client network domain, wherein the one or more potential paths are not pre-configured and the or each network segment identifier is suitable for inclusion in one or more data packets to indicate to at least one of the pair of overlay network nodes a preselected network segment routing for the one or more data packets. The present invention further provides a method for routing data packets in the multi-domain network. The method, in an overlay network node in the client network domain, comprises receiving one or more data packets, and retrieving a network segment identifier included in at least one of the one or more data packets. The method further comprises determining that the network segment identifier indicates that the one or more data packets should be routed over a pre-selected potential path through the server network domain, and, based on the determining, triggering the server network domain to configure the pre-selected potential path through the server network domain.