Scheduled OT Policy Deployment for Synchronized Enforcement
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Solution Overview
Problem
In operational technology (OT) networks, deploying new policies often results in network communication lags, processing delays, and devices enforcing different policies simultaneously, leading to synchronization issues.
Innovation Solution
A scheduled policy deployment system is implemented, where OT devices verify received policies, synchronize clocks, and enforce policies only when a trigger is enabled, ensuring synchronized policy application across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If policies are deployed to OT devices without synchronization coordination, then policy deployment speed is improved, but network synchronization deteriorates causing devices to enforce different policies simultaneously
Solution Approach 1:
The system performs preliminary actions by distributing policy packages to all OT devices before the scheduled deployment time. Each device verifies and stores the policy locally in advance, so that when the trigger time arrives, all devices can simultaneously enforce the new policy without waiting for real-time distribution, thus maintaining both deployment speed and synchronization.
Solution Approach 2:
The system implements feedback mechanisms where OT devices report their policy enforcement status back to the policy management system. This feedback loop allows the system to monitor whether all devices have successfully received and enforced the new policy, enabling corrective actions if synchronization issues arise.
2Reliability
If policies are deployed simultaneously to all OT devices, then network synchronization is improved, but communication lags and processing delays increase
Solution Approach 1:
The system sends policy packages to all OT devices in advance of the scheduled enforcement time. Devices verify, validate, and store policies locally before the trigger time arrives. This preliminary distribution eliminates the need for real-time synchronized transmission, reducing communication lags while maintaining simultaneous enforcement across all devices.
Solution Approach 2:
The policy deployment process is segmented into distinct phases: distribution phase (before trigger time), verification phase (local validation), and enforcement phase (simultaneous activation). This segmentation allows each phase to be optimized independently, reducing overall deployment time while maintaining synchronization.
3Ease of operation
If OT devices enforce policies at different times due to processing delays, then device processing autonomy is improved, but network consistency deteriorates causing conflicting policy enforcement
Solution Approach 1:
All OT devices receive and verify policy packages in advance, performing local validation autonomously before the trigger time. This preliminary autonomous processing ensures devices are ready to enforce policies simultaneously when the trigger occurs, maintaining both device autonomy and network consistency.
Solution Approach 2:
The system introduces a trigger mechanism as an intermediary that coordinates policy enforcement across all devices. The trigger, based on synchronized timestamps or external events, acts as a mediator that ensures all autonomous devices enforce policies at the same moment, preventing conflicting enforcement while preserving device independence.
Data Source
AI summary
An OT device includes a processor and a memory, accessible by the processor. The memory stores a first policy that includes a first set of settings associated with operation of the OT device. The memory also stores instructions that, when executed by the processor, cause the processor to enforce the first policy, receive a second policy and an indication of a trigger, wherein the second policy comprises a second set of settings associated with the operation of the OT device, receive an indication that the trigger is enabled, determine that the trigger is true, and, in response to the receiving the indication that the trigger is enabled and the determining that the trigger is true, enforce the second policy.