Smart PVLAN Trunk Port for Non-PVLAN Device Connectivity
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Solution Overview
Problem
Current PVLAN switches cannot simultaneously transmit information from multiple community VLANs to a non-PVLAN device, limiting communication isolation and requiring multiple links and ports.
Innovation Solution
A smart PVLAN trunk port is introduced, which can belong to multiple community VLANs or both community and isolated VLANs, allowing it to transmit information from all secondary VLANs to non-PVLAN devices by rewriting VLAN tags, thereby reducing the number of necessary links and ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current PVLAN switch configuration is used, then communication isolation is maintained, but the number of required ports and links increases
Solution Approach 1:
The smart PVLAN trunk port is designed to handle multiple VLAN types (community VLANs and isolated VLANs) simultaneously through a single port. The port can identify frame types based on destination addresses and apply different VLAN tag rewriting rules accordingly, making it a universal interface that replaces multiple specialized ports while maintaining communication isolation rules.
Solution Approach 2:
The invention changes the VLAN tag parameter dynamically based on the frame type. When receiving frames from community VLANs, the smart trunk port rewrites the VLAN tag to the primary VLAN ID. When receiving frames from isolated VLANs, it rewrites to the isolated VLAN ID. This parameter transformation enables a single port to handle multiple VLAN types without confusion.
2Adaptability or versatility
If multiple links are used to transmit information from multiple community VLANs, then all VLAN information can be transmitted, but the number of required ports and links increases
Solution Approach 1:
The invention merges the functionality of multiple trunk ports into a single smart PVLAN trunk port. This port combines the ability to handle community VLAN traffic and isolated VLAN traffic simultaneously by using destination address-based identification and applying appropriate VLAN tag rewriting rules for each frame type, thereby consolidating multiple links into one.
Solution Approach 2:
The smart PVLAN trunk port acts as an intermediary between the PVLAN switch and non-PVLAN devices. It receives frames from various VLANs, identifies their types through destination addresses, rewrites appropriate VLAN tags, and forwards them to the correct destinations. This intermediary function eliminates the need for multiple dedicated links while maintaining proper VLAN segmentation.
3Device complexity
If a smart PVLAN trunk port is introduced to reduce ports and links, then device complexity is reduced, but the processing requirement for VLAN tag rewriting increases
Solution Approach 1:
The smart PVLAN trunk port is pre-configured with rewriting rules that map destination addresses to appropriate VLAN tags. Before actual frame forwarding occurs, the system establishes the correspondence between destination addresses and VLAN identifiers. This preliminary configuration enables automatic and efficient VLAN tag rewriting without requiring complex real-time decisions during frame processing.
Data Source
AI summary
A PVLAN switch for connecting a PVLAN to a non-PVLAN device is configured as a primary VLAN with secondary VLANs, the primary VLAN includes promiscuous ports, each of the secondary VLANs includes a smart PVLAN trunk port, and the smart PVLAN trunk port is included in at least two secondary VLANs where the smart PVLAN trunk port and the promiscuous port connect to non-PVLAN devices. A frame is received on a smart PVLAN trunk port sent from a non-PVLAN device, and includes a destination address and a secondary VLAN ID. The PVLAN switch port ID for the first frame, and a primary VLAN ID for the secondary VLAN ID are identified. If the frame is a non-isolated port, the secondary VLAN ID is modified to be the primary VLAN ID, and the modified frame is sent to another non-PVLAN device connected to the PVLAN switch port.