E-tree Service Loop Prevention in MPLS Networks
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Solution Overview
Problem
Current methods lack a simple, user-friendly, and automatic solution for preventing traffic loops and communication between leaves in E-tree services within MPLS networks, particularly in complex multi-domain environments like VPLS and H-VPLS networks.
Innovation Solution
The method involves selecting and marking network ports with specific indications (Split Horizon Groups) to differentiate between connections to root and leaf points, prohibiting traffic forwarding between ports with equal indications while allowing it between ports with different indications, thereby implementing the Split Horizon rule to prevent loops and communication between leaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual configuration and monitoring of E-tree services is implemented, then loop prevention and leaf communication control can be achieved, but the complexity of network management increases significantly
Solution Approach 1:
The network system automatically performs Split Horizon Group marking on ports based on their role (root or leaf) in the E-tree structure. The marking is done autonomously by the network elements themselves without requiring manual configuration, thereby maintaining loop prevention reliability while reducing management complexity
Solution Approach 2:
The Split Horizon Group markings are pre-configured on ports during network setup or dynamic role assignment. This preliminary marking ensures that loop prevention rules are already in place before traffic flows occur, eliminating the need for complex real-time manual monitoring and control
2Extent of automation
If automatic port marking with Split Horizon Groups is implemented, then loop prevention becomes simpler and more automated, but the requirement for standardized port marking protocols increases system complexity
Solution Approach 1:
The invention uses simple numerical parameters (Split Horizon Group IDs) to mark ports, where different numbers represent different E-tree structures. This parameter-based approach simplifies the marking protocol by using basic numerical identifiers rather than complex structural descriptions, enabling automatic loop prevention while keeping the protocol manageable
Solution Approach 2:
The marking system applies uniform numerical labels (Split Horizon Group IDs) across all ports in the network. This homogeneous marking approach simplifies the protocol by using consistent numerical identifiers throughout the network, making automatic marking and recognition straightforward without requiring complex port-specific protocols
3Reliability
If strict Split Horizon rules are enforced to prevent leaf communication, then traffic loop prevention is improved, but the flexibility of network traffic routing is reduced
Solution Approach 1:
The Split Horizon Group markings act as intermediaries that enable automatic enforcement of Split Horizon rules. By using these numerical markers, the system automatically prevents leaf-to-leaf communication and traffic loops without requiring complex routing logic or manual intervention, thus maintaining reliability while preserving routing flexibility for permitted traffic
Data Source
AI summary
A method and device for managing E-tree services in an MPLS network having domains comprising network nodes and links, wherein the network is adapted to accommodate an E-tree structure formed by the network nodes for a specific E-tree service. The E-tree structure comprises a root point communicating with a number of leaf points, so that any network node of the E-tree structure is connected via its ports to links leading to a root point and/or a leaf point of said structure. The method comprises: marking ports of a specific node associated with links leading only to leaf points of the structure while marking differently ports of a specific node, associated with links leading to the root point; marking ports of a specific node connected to incoming or outgoing links of the same domain, and ensuring that traffic will not be returned thereby creating network loops.