Redundant Inline-Bypass Switch for Packet Continuity
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Solution Overview
Problem
Existing inline-bypass switch systems fail to maintain packet processing by inline tools when the switch appliance loses power, as they rely on a bypass component to physically bridge packets, preventing inline tool processing.
Innovation Solution
An inline-bypass switch system with two appliances, each equipped with a bypass component, switch, and controller, where the controllers manage the bypass components' states based on a shared state signal to ensure packet forwarding and processing continuity even during power loss or failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass component is used to physically bridge packets when the switch appliance loses power, then packet transmission continuity is improved, but packet processing by the inline tool is lost
Solution Approach 1:
The system divides the packet transmission path into two independent segments: a primary path through the switch appliance for processing, and a secondary bypass path for direct transmission. Each segment can be activated independently based on system state, allowing the bypass path to maintain transmission continuity while the primary path provides processing capability when operational.
Solution Approach 2:
The bypass component dynamically changes its state based on the switch appliance's operational status. When the switch appliance is functional, the bypass component blocks the bypass path and directs packets through the switch for processing. When the switch appliance fails, the bypass component opens to redirect packets through the bypass path, ensuring continuous transmission while processing capability is lost.
2Device complexity
If a single bypass component is used in a simple inline-bypass switch system, then device complexity is reduced, but system reliability is insufficient during power loss
Solution Approach 1:
The system applies different quality characteristics to different components: the bypass component is designed with fail-open characteristics (opening when powered down to ensure transmission), while the switch appliance provides intelligent packet forwarding when operational. This local differentiation of component behaviors ensures system reliability without requiring complex coordination mechanisms.
Solution Approach 2:
The bypass component automatically responds to power loss conditions without requiring external control signals. When the bypass component loses power, it automatically opens its relay contacts to redirect packets through the bypass path, providing self-service failover capability that enhances system reliability without adding complex control systems.
3Reliability
If the bypass component automatically opens when losing power, then packet transmission continuity is improved, but the bypass component cannot be controlled to maintain forwarding paths
Solution Approach 1:
The system implements feedback mechanisms where the controller monitors the bypass component's state and adjusts it accordingly. When the bypass component is powered on and operational, the controller closes it to establish the bypass path. When powered down, the component automatically opens, providing failover. This feedback control maintains both automatic reliability and operational flexibility.
Data Source
AI summary
An inline-bypass switch system includes: a first inline-bypass switch appliance having a first bypass component, a first switch coupled to the first bypass component, and a first controller; and a second inline-bypass switch appliance having a second bypass component, a second switch coupled to the second bypass component, and a second controller; wherein the first controller in the first inline-bypass switch appliance is configured to provide a state signal that is associated with a state of the first inline-bypass switch appliance; and wherein the second controller in the second inline-bypass switch appliance is configured to control the second bypass component based at least in part on the state signal.