VPC Route Propagation
In order for your AWS VPC(s) to communicate with other connections to your Pureport network, you need to ensure that route propagation is enabled on each VPC that connects either directly to Pureport or is connected via Direct Connect Gateway. This setting controls whether or not the VPC's routing table sends and receives routes via BGP. Depending on whether you are using the Virtual Private Gateway or connecting directly to a VGW attached to a single VPC, you may need to complete this step on more than one VPC.
In the AWS Console, open the VPC dashboard, click on Route Tables and select the route table which corresponds to your VPC, then click on Route Propagation to determine whether propagation is enabled:
If propagation is set to No, click the Edit route propagation button to change the setting: