Reusable Zone Network Fabric Switch Group Segmentation
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Solution Overview
Problem
Current zoning protocols in network devices, such as SAS and Fibre Channel, are limited by the number of customizable zones, which restricts network administrators in implementing desired access control schemes as the number of devices increases, leading to zone exhaustion.
Innovation Solution
Implementing zone reuse by dividing available zone labels into reusable and non-reusable groups within switch groups, allowing zone numbers to be reused locally within each group while maintaining global uniqueness, and managing access control through switch group assignments and permission tables to enforce access restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional zoning protocols are used with a fixed number of zone labels, then the zoning system is simple to implement, but the number of available zones is limited and cannot accommodate increased device counts
Solution Approach 1:
The patent divides the network fabric into multiple switch groups, where each switch group can independently reuse zone labels. This segmentation allows zone numbers to be reused locally within each switch group while maintaining global uniqueness through the combination of switch group ID and zone label, thereby expanding the total number of available zones without requiring additional zone label bits.
Solution Approach 2:
The patent introduces a new dimension to zone identification by combining switch group membership with zone labels. Instead of relying solely on zone label uniqueness across the entire fabric, the system creates a hierarchical identification scheme where zones are unique within their switch group context, effectively adding a spatial dimension to zone addressing that expands capacity without increasing label size.
2Quantity of substance
If zone reuse is implemented across the entire network fabric, then the number of available zones increases, but access control security is compromised as devices can access zones outside their local switch group
Solution Approach 1:
The patent segments the network fabric into isolated switch groups where zone reuse is permitted. Each switch group acts as an independent zone containment domain, preventing devices in one switch group from accessing zones in another switch group even if they share the same zone label. This segmentation maintains access control security while enabling zone reuse within each isolated segment.
Solution Approach 2:
The patent applies different zone accessibility rules to different parts of the network. Within each local switch group, zones are accessible to all members (local quality of openness), but zones are not accessible across switch group boundaries (local quality of isolation). This localized application of accessibility rules enables zone reuse while maintaining security through boundary enforcement.
3Quantity of substance
If more zone labels are allocated to accommodate more devices, then the number of available zones increases, but the zone labels are exhausted and cannot be reused, leading to inefficient use of the address space
Solution Approach 1:
The patent enables zone label recovery by allowing zone labels to be discarded (reused) in different switch groups after they have been used in one switch group. Instead of requiring unique zone labels across the entire fabric, the system recovers zone labels for reuse in other switch groups, dramatically increasing the effective number of available zones from the limited label space.
4Quantity of substance
If zone labels are made longer to provide more unique identifiers, then the number of available zones increases, but the overhead for zone label transmission and processing increases
Solution Approach 1:
The patent uses copying of zone labels within switch groups instead of creating new unique identifiers. The same zone label can be copied and used in multiple switch groups, with the switch group context providing the necessary disambiguation. This approach maintains compact zone label sizes while expanding the effective address space through contextual reuse.
Data Source
AI summary
Implementations of the disclosed technology may respond to a discovery request according to the origination of the discovery request. In these implementations, a discovery request for a connection to a device assigned to a reusable zone may be obtained. If the discovery request does not originate from a local switch group, the discovery response may indicate that there is no device at the connection.