Prefix Lists & Policies in Cloud ROUTER

Miralem Cebic Updated by Miralem Cebic

The DE-CIX Cloud ROUTER allows you to manage Prefix Lists and Routing Policies to control which prefixes are exchanged with your connected networks.

Managing Prefix Lists and Policies in the DE-CIX Cloud ROUTER Portal

Note: The Portal supports creating, deleting, and attaching Prefix Lists and Policies. Editing or viewing all existing Prefix Lists or Policies is only possible via the API.

1. Creating a New Prefix List

  1. Navigate to the Prefix Lists section in the Cloud ROUTER Portal.
  2. Click Add Prefix List.
  3. In the New Prefix List window:
    • Enter a descriptive Name for your Prefix List.
    • Click Add Prefix to specify one or more prefixes.
      • For each prefix, you can set:
        • Prefix Match – the network prefix (e.g., 203.0.113.0/24)
        • Min length – minimum prefix length allowed
        • Max length – maximum prefix length allowed
  4. Once your entries are complete, click Save.

2. Creating a New Policy

  1. Go to the Policies section in the Cloud ROUTER Portal.
  2. Click New Policy.
  3. In the New Policy window:
    • Enter a descriptive Name for your policy.
    • Under Policy Entries, click Add Prefix List.
    • Search for and select the desired Prefix List (you can use the search field to filter).
  4. Configure the routing behavior for the selected Prefix List:
    • Local Preference – sets the BGP Local Preference value for accepted routes.
    • AS Path Prepend – adds one or more copies of your AS number to the AS path for outbound routes.
    • Filter – choose one of:
      • Accept – allow routes matching the Prefix List
      • Reject – deny routes matching the Prefix List
      • Continue – evaluate further policy entries
  5. To add more entries, repeat the Add Prefix List process.
  6. Use drag-and-drop (☰ icon) to reorder policy entries if needed.
  7. Click Save & Attach to save the policy and link it directly to the selected Cloud ROUTER connection.

3. Importing From an Existing Policy

  • In the New Policy screen, click Import from Policy to duplicate entries from another existing policy.
  • This can save time when reusing existing configurations.

Prefix Lists

A Prefix List is a set of IP prefixes that you can use to define which routes are accepted or advertised.

Possible actions via the API:

  • Create a Prefix List
  • Delete a Prefix List
  • Edit an existing Prefix List (add/remove prefixes)
  • View (list) all Prefix Lists

Possible actions via the Portal:

  • Create a Prefix List
  • Delete a Prefix List
  • Attach a Prefix List to a Cloud ROUTER connection

Note: Editing an existing Prefix List or listing all Prefix Lists is not supported in the Portal — these actions require the API.

Policies

Policies define how your Cloud ROUTER processes routing information — for example, which routes are allowed, rejected, or modified.

Possible actions via the API:

  • Create a Policy
  • Delete a Policy
  • Edit a Policy (change rules, conditions, actions)
  • List all Policies

Possible actions via the Portal:

  • Create a Policy
  • Delete a Policy
  • Attach a Policy to a Cloud ROUTER connection

Note: Changing or viewing the full list of existing Policies is only possible through the API.

Summary Table

Feature

API Support

Portal Support

Create

✅

✅

Delete

✅

✅

Attach to Connection

✅

✅

Edit / Change

✅

❌

List All

✅

❌

API Documentation is here: https://api-docs.de-cix.net/#0a282fef-297f-4c4f-aba9-a7d4aa7ddf06

How did we do?

Prefix Lists

Get in touch