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Design an enterprise network on AWS Cloud WAN as a policy-managed global core: select the Regions where the network needs edges, define segments around real trust boundaries, map attachments into those segments with ordered policies, and make every cross-segment route or inspection path intentional. Treat policy rollout, account ownership, and monitoring as part of the architecture—not as work to add after connectivity is live.
What Cloud WAN controls—and what you still have to design
AWS Cloud WAN is a managed wide-area networking service for connecting AWS and on-premises resources. The global network is the high-level container; its core network is the network AWS implements from your policy. Each Region configured in that policy gets a core network edge. AWS describes those edges as a full mesh, with redundant connections and multiple paths. AWS Cloud WAN overview
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The policy describes Regions, segments, route sharing, attachment placement, and related routing behavior; AWS manages the underlying network implementation. Attachments are the connections or resources joined to the core. Segments are distinct routing domains, similar in purpose to globally consistent VRFs. Attachments communicate within their own segment by default; communication across segments requires deliberate route sharing. Core network policy parameters
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Start with Regions, trust boundaries, and route intent
Select Regions for actual connectivity needs
Choose the Regions in which workloads, users, or hybrid connections require a Cloud WAN edge. The policy’s configured Regions determine those edge locations and where attachments can connect. AWS maintains segment and routing configuration consistently across the configured edges. Confirm that required Regions and attachment types are currently supported before basing a design on them; availability can change. AWS Cloud WAN overview Core network policy parameters
Make segments reflect security and operational boundaries
Common candidates include production, development, shared services, and separate business or regulatory environments. These are starting points, not a prescribed taxonomy: create a segment when its resources need a distinct routing boundary or ownership model. A segment is not an automatic authorization system; it defines routing behavior, and access controls and security controls remain part of the broader architecture.
Write down the intended communication paths before configuring sharing. For each boundary, decide whether routes should remain isolated, be shared one way, or be shared both ways, and which prefixes or route attributes are allowed. This makes it easier to review policy changes against a concrete intent rather than treating connectivity as a blanket default.
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Use a design matrix before writing policy
| Design area | Decision to record | Operational check |
|---|---|---|
| Regions | Which Regions need edges and which resources attach in each | Confirm current regional and attachment support |
| Segments | Which trust or application domains need separate routing | Identify each intended route-sharing relationship |
| Attachment placement | Which account, resource type, tags, and Region map to each segment | Check tag ownership and how unmatched attachments are handled |
| Inspection | Which traffic classes must traverse network functions | Validate the actual paths, including inter-Region paths, and appliance capacity separately |
| Operations | Who owns core policy, attachments, deployment, and recovery | Define review, deployment, monitoring, and rollback responsibilities |
Place attachments with ordered policy rules and guardrails
Attachment policies can match tags and metadata such as account, resource ID, attachment type, and Region. Rules are evaluated in ascending rule-number order, and the first matching rule determines the action. If no rule matches, the attachment remains unassociated rather than being placed automatically. Core network policy parameters
- Define an ownership and tagging contract. Specify who applies and reviews the tags that determine environment, segment, and owner. Treat tags used for placement as network-control inputs, not merely inventory labels.
- Write narrow rules before broad rules. Order exceptions and sensitive attachment classes so a general rule cannot capture them first. Use metadata and tags to automate placement where that mapping is stable.
- Decide how unmatched attachments are detected and resolved. Because no-match attachments do not join a segment, give network operators a way to find them and an owner who can correct their metadata or policy.
- Review sensitive placement. Require an owner or security review when a rule could move an attachment into a more trusted segment or alter its reachability.
AWS’s two-segment example shows tag-based mapping across three Regions, with Secured and Non-Secured segments and attachment acceptance. It is an illustrative configuration, not a recommended universal segment count or production benchmark. Two-segment, multi-Region example
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Manually assigning every attachment by resource ID can work for a small, stable environment, but AWS notes that each new attachment then requires a policy change. For a growing estate, tag- and metadata-based rules reduce that per-resource policy maintenance, provided the organization audits the tags those rules depend on. Core network policy parameters
Control sharing and insert inspection paths deliberately
Separate route sharing from segment membership
Do not treat membership in different segments as connected by default, or assume that sharing is one-way. Segment sharing is bidirectional unless filters restrict its direction. Define the specific route exchange needed between domains and use filters to prevent unrelated prefixes from crossing the boundary. Core network policy parameters
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsFor more granular route control, Cloud WAN routing policies support filtering, summarization, and preference changes. Documented rules can block routes or modify route attributes, including BGP communities and AS paths. AWS documentation identifies policy version 2025.11 as required for route policies and also lists 2021.12 as an available version; verify the current policy-version requirements when implementing. Route policy guide
Use network function groups for explicit service insertion
Network function groups collect attachments that host network or security functions, such as firewalls or intrusion detection and prevention systems. Segment actions can use send-via to steer east-west traffic through functions or send-to to send north-south traffic to a function. AWS documents steering for intra-Region and inter-Region traffic through these attachments. Core network policy versions
Specify which traffic must be inspected, where the function attachments live, and what the intended path is for each relevant traffic class. Then validate routing and appliance behavior in the deployed environment. The capability to steer traffic through a function does not establish that a particular appliance is suitable or that inspection alone satisfies a compliance obligation.
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Connect AWS and hybrid networks within the supported scope
AWS’s getting-started guide covers Cloud WAN attachments for VPCs, Site-to-Site VPNs, Direct Connect gateways, Transit Gateway Connect, and Transit Gateway route tables. It also describes tunnel-less and GRE Connect peer connections with third-party appliances, including SD-WAN devices. Existing Transit Gateways can be registered and peered with Cloud WAN, providing a path for coexistence or a staged transition rather than requiring every environment to move at once. Check the current prerequisites and regional support for the specific attachment type before implementation. Cloud WAN getting started
Cloud WAN supports IPv6 on dual-stack endpoints while maintaining IPv4 endpoint compatibility. The AWS overview describes Cloud WAN PrivateLink support as limited to us-west-2 and us-gov-west-1, with IPv6 dual-stack endpoints. Because these are time-sensitive availability details, verify them against the current overview when planning a deployment. AWS Cloud WAN overview
Design ownership for a multi-account network
Separate the core network owner from attachment owners. The core network owner controls policy and network configuration; attachment owners may be in other accounts to which the network is shared. AWS describes AWS Resource Access Manager as the mechanism for sharing the network with those accounts. Decide which team approves connectivity, owns attachment metadata, and responds when an attachment is unassociated or placed incorrectly. AWS Cloud WAN overview
Include data location in governance review where it matters. AWS’s overview states that the home Region for aggregated core-network data is US West (Oregon), cannot be changed after it is established, and receives regional usage and topology-related data; AWS describes the transfer as encrypted in transit and the data as encrypted at rest. Confirm the current behavior and its fit with organizational requirements before deployment. AWS Cloud WAN overview
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Stage policy changes, deploy explicitly, and monitor the live network
Use the policy lifecycle as a change-control boundary
Policies can be authored in the console’s visual editor or as JSON. A policy change creates a new version for review as a change set; creating the version does not automatically make it live. A version in Ready to execute state can be deployed as the LIVE policy, and AWS supports restoring an earlier version. Core network policy versions
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- Review the proposed policy diff against the intended Region, segment, attachment, sharing, and inspection changes.
- Validate rule ordering, tags, route filters, and the likely effect on existing attachments before approval.
- Deploy the reviewed version only through the organization’s change process; assign a deployment owner and a recovery owner.
- After deployment, confirm attachment association and intended routes, then monitor relevant events and metrics.
- If the change causes an unacceptable outcome, use the documented earlier-version restore capability under the organization’s recovery process.
Code review, validation, change windows, and an identified rollback owner are operational safeguards to establish around the AWS lifecycle; they are not automatic product guarantees.
Make monitoring usable before a failure
Cloud WAN dashboards, events, and metrics support monitoring. AWS notes that CloudWatch Logs Insights onboarding is needed before events appear on the dashboard, so configure that path as part of operational readiness rather than expecting event visibility without setup. AWS also notes that a first core network deployment can sometimes take up to 30 minutes; allow for that possibility in initial rollout planning instead of treating it as an instantaneous change. Cloud WAN getting started
Validate the design before committing to it
When comparing Cloud WAN with a Transit Gateway-centered or appliance-led WAN, evaluate the same requirements against each option rather than assuming a managed global core is automatically the better fit:
- Whether the required geographies and Regions are supported.
- How precisely the design can isolate segments and constrain route sharing.
- Whether needed AWS and hybrid attachment types fit the current support matrix.
- Whether required inspection and service-insertion paths can be implemented and validated.
- How policy review, explicit deployment, and recovery fit the organization’s change process.
- Whether account ownership and the home-Region data behavior meet governance requirements.
- Total cost for the actual Regions, attachments, traffic, and chosen services, using current AWS pricing and workload assumptions.
The AWS overview links to pricing, but a specific price is not established here. Build a workload-specific estimate from current AWS pricing rather than applying a generic per-network figure. AWS Cloud WAN overview
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