---
title: Customer Metadata Boundary · Data Localization Suite docs
description: As part of the Data Localization Suite, the Customer Metadata Boundary (CMB) ensures that any traffic metadata that can identify a customer’s end user (that is, contains the customer's Account ID) will stay in the EU (European Union) or in the US (United States), depending on the region the customer selects. For example, if a customer selects the EU Customer Metadata Boundary, metadata will only be sent to our core data center located in the European Union.
lastUpdated: 2025-02-07T17:34:35.000Z
source_url:
  html: https://635cd638.preview.developers.cloudflare.com/data-localization/metadata-boundary/index.md
  md: https://635cd638.preview.developers.cloudflare.com/data-localization/metadata-boundary/
---

As part of the Data Localization Suite, the Customer Metadata Boundary (CMB) ensures that any traffic metadata that can identify a customer’s end user (that is, contains the customer's [Account ID](https://developers.cloudflare.com/fundamentals/setup/find-account-and-zone-ids/)) will stay in the `EU` (European Union) or in the `US` (United States), depending on the region the customer selects. For example, if a customer selects the `EU` Customer Metadata Boundary, metadata will **only** be sent to our core data center located in the European Union.

## Customer traffic metadata flow

The following diagram is a high-level example of the flow of how metadata about a customer's traffic is generated on a Cloudflare data center. Logs are exclusively sent to the EU core data center for Cloudflare customers and their authorized users to access and view.



```mermaid
sequenceDiagram
    participant UserEU as End user
    participant CloudflarePoP as Closest data center
    participant EUCoreDC as Core data center in EU
    participant CloudflareSuperAdmin as Admin

    UserEU->>CloudflarePoP: Connects
    Note right of CloudflarePoP: Customer Logs generated <br> (for example, HTTP requests and Firewall events)
    CloudflarePoP-->>EUCoreDC: Forwards encrypted Customer Logs
    Note right of EUCoreDC: Authorized users can view Logs & Analytics <br> on the UI or via API
    CloudflareSuperAdmin->>EUCoreDC: Authenticated access
    EUCoreDC->>CloudflareSuperAdmin: Logs & Analytics
    CloudflarePoP->>UserEU: Response
```



## Log management

Additionally, customers have the option to configure [Logpush](https://developers.cloudflare.com/logs/about/) to push their Customer Logs to various storage services, SIEMs, and log management providers.

## Product specific-behavior

For detailed information about product-specific behavior regarding Metadata Boundary, refer to the [Cloudflare product compatibility](https://developers.cloudflare.com/data-localization/compatibility/) page.
