Stacked Switch Member Device Unicast Packet Forwarding
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Solution Overview
Problem
Existing stacked switches systems face challenges in efficiently managing unicast packet forwarding across multiple stack groups with varying topologies, leading to suboptimal path selection and increased complexity in configuring forwarding tables.
Innovation Solution
The proposed solution involves a method for unicast packet forwarding in a stacked switches system, where switches within a stack group are connected in ring or chain topologies, and inter-group connections are established through aggregated stack link groups, allowing for the selection of the shortest path based on hop count and preferred stack ports or link groups, thereby optimizing forwarding paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional packet forwarding methods are used in stacked switches systems, then packet forwarding can be achieved, but path selection is suboptimal and forwarding table configuration complexity increases
Solution Approach 1:
The patent segments the stacked switches system into multiple stack groups, where each stack group is assigned a unique stack group identifier. This segmentation allows the forwarding device to make path selection decisions based on the destination stack group identifier, simplifying the forwarding table configuration while optimizing path selection across the distributed switch architecture.
2Adaptability or versatility
If multiple stack groups with varying topologies are used, then system scalability is improved, but path selection complexity and forwarding table configuration difficulty increase
Solution Approach 1:
The patent introduces stack group identifiers as a new parameter for path selection, changing the traditional forwarding decision parameters. By using destination stack group identifiers rather than detailed topology information, the system achieves scalability across multiple stack groups with varying topologies while keeping path selection logic simple and forwarding table configuration manageable.
Data Source
AI summary
A member device of a stacked switches system sends a first received unicast packet via an inter-group stack port which belongs to an aggregated stack link group on a forwarding path towards a different stack group when the first received unicast packet is to be egressed by another member device in the different stack group. The member device is further to send a second received unicast packet via an intra-group stack port on a forwarding path towards another member device in a same stack group when the second received unicast packet which is to be egressed by the another member device in the same stack group. The member device is further to send a third received unicast packet via a data port on the member device which associates with a egress port identification of the third received unicast packet when the third received unicast packet is to be egressed by the member device.