Transit gateway policy tables in Amazon VPC Transit Gateways

Transit gateway dynamic routing uses policy tables to route network traffic for AWS Cloud WAN. The table contains policy rules for matching network traffic by policy attributes, and then maps the traffic that matches the rule to a target route table.

You can use dynamic routing for transit gateways to automatically exchange routing and reachability information with peered transit gateway types. Unlike with a static route, traffic can be routed along a different path based on network conditions, such as path failures or congestion. Dynamic routing also adds an extra layer of security in that it's easier to re-route traffic in the event of a network breach or incursion.