Mobility Switch VLAN Mapping for Roaming Consistency
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Solution Overview
Problem
Conventional methods struggle to maintain consistent network policy enforcement and IP address consistency for users as they roam between wired and wireless access points across different locations in a mobility domain, leading to segregation of wireless and wired networks.
Innovation Solution
The method involves mapping a logical network identifier, such as a VLAN ID, from a mobility VLAN to a wired VLAN at a mobility switch, ensuring that mobile devices are associated with the correct user's wired VLAN, thereby maintaining consistent network policies and IP addresses across different access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate VLANs are used for wired and wireless networks, then network security and policy control are improved, but user identification and policy consistency across access points deteriorate
Solution Approach 1:
The patent merges wired and wireless VLANs into a unified VLAN structure where both access types share the same broadcast domain and policy enforcement mechanism. This allows consistent user identification and policy application across both wired and wireless access points while maintaining security boundaries through the unified VLAN framework.
Solution Approach 2:
The patent creates a universal VLAN identifier that serves both wired and wireless networks simultaneously. This single VLAN structure performs multiple functions: it provides policy enforcement, user identification, and network segmentation for both access types, eliminating the need for separate VLAN configurations.
2Reliability
If VLAN scope is bounded by layer 3 routers, then network segmentation and security are improved, but roaming user connectivity across L3 boundaries deteriorates
Solution Approach 1:
The patent introduces mobility switches as intermediary devices that operate at layer 2 to extend VLAN connectivity across layer 3 boundaries. These mobility switches maintain the unified VLAN structure and provide seamless roaming connectivity for users moving between different L3 networks while preserving network segmentation through the L2 VLAN framework.
Solution Approach 2:
The patent extends the traditional 2D VLAN structure (within a single L3 network) into a 3D structure that spans multiple L3 boundaries. By adding the dimension of layer 3 routing while maintaining layer 2 VLAN unity, users can roam across different IP subnets while remaining in the same unified VLAN broadcast domain.
3Adaptability or versatility
If mobility VLAN and wired VLAN are separated, then wireless mobility support is improved, but user identification consistency deteriorates
Solution Approach 1:
The patent combines mobility VLAN and wired VLAN into a single unified VLAN structure. This merger ensures that user identification remains consistent whether the user accesses the network via wired or wireless means, while still providing full wireless mobility support through the unified structure.
Solution Approach 2:
The patent applies homogeneity by using the same VLAN identifier and policy framework for both wired and wireless users. This creates a homogeneous network environment where user identification and policy enforcement are consistent across all access types, eliminating the information loss that occurs with separate VLAN structures.
Data Source
AI summary
In a mobility domain providing wired and wireless network transport to an enterprise or campus environment, a mobility switch maps a logical network identifier, such as a VLAN ID, to a “home” or wired network VLAN ID so that a mobile device is mapped to the wired VLAN for user identification, IP address consistency, and network policy enforcement. Propagation of the mapping to mobility switches ensures that a roaming user is mapped to the wired network VLAN from a remote L2 switch, and mobility tunnels across L3 boundaries allow roaming into a different broadcast domain or L3 switch connectivity in the mobility domain. Users are assigned to mobility VLAN(s) which are mapped to a VLAN in the wired domain at a mobility switch. The wireless users can roam within the wireless enterprise, or mobility domain, and the network maintains access to the user assigned mobility VLAN(s).