Forced MAC Learning in Bridged Ethernet Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Ethernet technologies are connection-less, making it difficult to apply traditional path provisioning techniques in transport networks, which require connection-oriented features, and existing solutions like GMPLS-controlled Ethernet Label Switching add complex protocol stacks, increasing costs.
Innovation Solution
The implementation of a constrained-based source-routing method using Ethernet MAC learning for path provisioning in bridged Ethernet networks, employing a lightweight protocol stack to establish connection-oriented paths with a path learning frame mechanism that constructs and forwards lists of links with destination and source addresses, and VLAN IDs through intermediate bridge nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional path provisioning techniques are applied in Ethernet networks, then connection-oriented features are achieved, but device complexity increases due to complex protocol stacks
Solution Approach 1:
The patent uses MAC learning frames that copy the structure of existing Ethernet frames while incorporating path provisioning information. Instead of implementing entirely new complex protocols, the invention embeds path setup capabilities within standard Ethernet MAC frame structures, allowing bridges to learn and forward paths using extended MAC learning functionality rather than complex new protocol stacks
Solution Approach 2:
The patent makes the existing MAC learning mechanism multi-functional by enabling it to perform both traditional MAC address learning and path provisioning functions. The MAC learning frame serves dual purposes: maintaining standard Ethernet bridging operations while simultaneously establishing connection-oriented paths, eliminating the need for separate complex protocol stacks
2Productivity
If GMPLS-controlled Ethernet Label Switching is implemented, then path provisioning capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses lightweight, simple MAC learning frames instead of complex GMPLS protocol structures. These frames are simple Ethernet-based structures that can be processed by standard bridge hardware, avoiding the need for expensive complex protocol stacks while maintaining path provisioning functionality
Solution Approach 2:
The patent replaces the mechanical complexity of GMPLS protocol stacks with a simpler Ethernet MAC learning mechanism. Instead of implementing complex signaling protocols and state machines, the invention uses extended MAC learning frames that leverage existing Ethernet bridge functionality, substituting complex control plane mechanisms with simpler data plane operations
Data Source
AI summary
A system, method, and Ethernet bridge utilizing forced MAC learning to set up a path from an originating node, PON (23) to one or more terminating nodes, PTN (12) through intermediate bridge nodes (14, 21). In the point-to-point case, a Previous Hop Bridge (PHB) list defines the links in the path. Each link includes a destination address, source address, port number, and VID. A path learning frame (13, 19, 22) containing the list is sent in reverse order from the PTN through the intermediate bridge nodes to the PON. Each node in the path saves the received frame's header information as learned path information using standard MAC learning functionality, removes the node's own information from the list, and forwards the frame with the remainder of the list to the next node using the port specified by the port number for that link. When the frame arrives at the PON, all nodes have saved the learned path information.