How Do I Plan the ASN for Interconnection Between Direct Connect and Enterprise Router?

To ensure the stable running and efficient management of Direct Connect connections, you are advised to comply with the following ASN planning principles:

• Do not use reserved ASNs.

  Do not use 64512 as the ASN of the on-premises data center or enterprise router. This ASN is reserved for Direct Connect. If this ASN is used, there may be route conflicts or configuration exceptions.

• Plan independent ASNs.
  If a connection is used to access multiple VPCs in different regions, you are advised to plan independent ASNs for the global DC gateway and enterprise router in each region to:

  • Prevent BGP route learning conflicts between regions.
  • Ensure the routes that direct traffic to or from instances in each region are independent and secure.
  • Help with network management and troubleshooting.

Good ASN planning improves connection reliability and management, keeping networks stable when a connection is used to access multiple VPCs across regions.