Auto-Attach Signaling for WLAN Selection in SPB Networks
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Solution Overview
Problem
Current shortest path bridging networks lack the ability for edge devices to perform MAC-in-MAC encapsulation, limiting their functionality compared to VLAN encapsulation, and existing solutions restrict mobile stations to static VLANs, reducing flexibility in network coupling.
Innovation Solution
Implementing auto-attach technology in shortest path bridging networks, where an access point acts as a proxy between mobile stations and auto-attach enabled devices, allowing dynamic VLAN creation and service instance identifier mapping, enabling flexible communication through virtual local area networks independent of static VLANs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If edge devices use VLAN encapsulation in shortest path bridging networks, then network functionality is improved, but device complexity increases because MAC-in-MAC encapsulation cannot be performed
Solution Approach 1:
The patent introduces an auto-attach server as an intermediary component that performs MAC-in-MAC encapsulation on behalf of edge devices. The auto-attach server receives untagged packets from edge devices, performs the required encapsulation with I-SID tags, and forwards them into the SPB network. This mediator approach enables advanced encapsulation functionality without requiring edge devices to have complex MAC-in-MAC capabilities.
2Ease of operation
If mobile stations are restricted to static VLANs, then network management is simplified, but flexibility in network coupling is reduced
Solution Approach 1:
The patent implements dynamic VLAN assignment through the auto-attach mechanism. When a mobile station connects to the network, the auto-attach server dynamically assigns appropriate I-SIDs and VLAN mappings based on the station's needs and network conditions. This dynamic approach allows mobile stations to be coupled to different VLANs and service instances as required, providing flexibility while the auto-attach server maintains centralized management control.
3Adaptability or versatility
If auto-attach technology is implemented, then network flexibility is improved, but device complexity increases due to proxy functionality
Solution Approach 1:
The access point serves as a proxy and intermediary between mobile stations and the auto-attach server. It receives connection requests from mobile stations, forwards them to the auto-attach server, and relays the assigned VLAN and I-SID information back to the mobile station. This proxy functionality enables the access point to support dynamic auto-attach without requiring full MAC-in-MAC encapsulation capability at the access point itself, thus managing complexity through distributed functionality.
Data Source
AI summary
Implementing auto attach for a shortest path bridging (SPB) network comprises determining, on an access point, that an auto attach device communicating in a SPB network is enabled for auto attach, and an advertisement is transmitted to a mobile station. The access point acts a proxy between the mobile station and the auto-attach device by communicably coupling the auto attach device and the mobile station via the access point. A virtual local area network (VLAN) identification and service instance identifier (I-SID) is received from the mobile station, when is then transmitted to the auto-attach device. A VLAN (independent of any static VLAN associated with the WLAN) is created off of the VLAN identification and an indication that the I-SID and the VLAN have been accepted. Data communications are then provided between the mobile station and the auto attach device via the VLAN and the access point.