Segmentation Operations, Governance, and Assurance

Industrial microsegmentation changes communication paths and must be operated under the same discipline as other consequential OT controls.

Managed lifecycle

Discover assets and required flows
        ↓
Define zones, domains, users, and ownership
        ↓
Build the approved communication matrix
        ↓
Add equipment- and operation-aware policy
        ↓
Simulate and validate representative traffic
        ↓
Observe before blocking where required
        ↓
Activate under change control
        ↓
Review evidence, exceptions, and policy drift

Required governance

Governance item	Purpose
Segment and domain owner	Establish responsibility for membership and permitted communication
Communication matrix	Record required source, destination, direction, and service relationships
Industrial authority matrix	Record permitted users, equipment, points, operations, and conditions
Default policy	Define explicit handling when no reviewed rule matches
Change and exception process	Prevent temporary broad access from becoming permanent trust
Evidence and retention policy	Preserve the information required for operations, audit, and investigation
Failure and rollback plan	Define safe behavior if enforcement or connectivity becomes unavailable

Operational capabilities

• create, revise, clone, and retire protected access domains;
• manage user, group, network, and access-policy assignment;
• inspect effective policy and active sessions;
• preview communication impact and detect conflicting or shadowed rules;
• activate, suspend, disconnect, or contain an access path;
• monitor permitted and blocked communication;
• correlate session activity with industrial events and decisions;
• operate Connect and standalone enforcement together;
• retain administrative changes and operating evidence.

Production qualification

Each deployment should verify:

• all required North-South and East-West paths;
• both communication directions and return traffic;
• normal, maintenance, startup, recovery, and emergency operation;
• identity, session, equipment, and point mapping;
• allow, block, timeout, replay, and stateful behavior;
• broadcast, unknown destination, routing, and site-connection behavior where applicable;
• capacity, latency, failure posture, bypass, and rollback;
• evidence completeness and retention.

Product boundary

Segmentation reduces unnecessary communication and can limit lateral movement. It does not replace endpoint security, identity governance, process interlocks, safety systems, physical security, vulnerability management, or disciplined operating procedures.

Use the Customer Evaluation Checklist to prepare a production assessment.