Policy-Based Routing (PBR) on AWS Transit Gateway lets network administrators route traffic based on source/destination IPs, ports, and protocols rather than just destination IPs. This addresses previous limitations forcing complex multi-VPC architectures and simplifies workload isolation and traffic steering without additional routing hops.
Users associate policy tables with attachments and define ordered rules applying first-match logic to direct traffic to specific routing tables. Use cases include routing via AWS Firewalls or third-party appliances, directing traffic over AWS Direct Connect or VPN paths based on packet attributes, and isolating environments for security. PBR is available in all AWS commercial regions without extra charges beyond Transit Gateway fees.
Source & further reading
AWS announces general availability of Policy-Based Routing on AWS Transit Gateway ↗Source published 2026-07-30. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.