Segment Routing Multicast Lists for Stateless Traffic Forwarding
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Solution Overview
Problem
Existing segment routing technologies face challenges in implementing multicast traffic forwarding due to the need for manual configuration and maintenance of forwarding states at each node, which is burdensome and error-prone, deviating from the original design purpose.
Innovation Solution
A multicast method in a segment routing label network that involves acquiring a multicast segment list based on network topology, encapsulating it in traffic, and using multicast segment ID forwarding structures to direct traffic to specific nodes, reducing the need for manual configuration and state maintenance at intermediate nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual configuration and maintenance of forwarding states is implemented at each node, then multicast traffic forwarding can be achieved, but the workload increases and error-prone manual configuration is required
Solution Approach 1:
The patent implements automatic forwarding state maintenance where the system self-configures multicast routing states through controller-based management. The controller automatically distributes forwarding information to network nodes, eliminating manual configuration requirements while ensuring accurate multicast traffic forwarding through automated state synchronization.
2Reliability
If the controller is connected to each network boundary node and intermediate forwarding node to issue forwarding information, then multicast forwarding can be enabled, but the controller complexity and connection requirements increase
Solution Approach 1:
The patent creates a universal controller architecture that can serve multiple network nodes through a standardized interface. The controller implements multi-functional capabilities to manage both boundary nodes and intermediate forwarding nodes using the same control plane, reducing the need for separate connection mechanisms while maintaining reliable forwarding information distribution across diverse node types.
3Reliability
If each intermediate node maintains the forwarding state of each piece of traffic, then precise traffic control is achieved, but this violates the original design purpose of segment routing
Solution Approach 1:
The patent introduces the multicast segment list as an intermediary data structure that carries forwarding state information through the network. Instead of requiring each intermediate node to maintain complete traffic state, the segment list acts as a mediator that encapsulates routing information, allowing nodes to forward traffic based on segment identifiers while preserving segment routing's original design principles of simplified node operation and centralized control.
Data Source
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AI summary
The present application belongs to the technical field of communications. Disclosed are a multicast method and device in a segment routing label network, and a medium. The method comprises: at an ingress node, acquiring at least one multicast segment list, the multicast segment list being determined by means of a topology relationship between nodes in a segment routing label network, wherein one multicast segment list corresponds to one independent downstream sub-tree of the ingress node, elements in the multicast segment list correspond to nodes in the independent downstream sub-tree, and the elements in the multicast segment list are represented by a multicast segment identifier forwarding structure; receiving multicast traffic and encapsulating in the multicast traffic the multicast segment list; and sending the multicast traffic to a node indicated by the outermost multicast segment identifier forwarding structure in the multicast segment list, such that the node forwards the multicast traffic on the basis of the multicast segment identifier forwarding structure of the multicast segment list.