- In the FortiOS CLI, enter the following commands to verify the routes received and advertised via BGP between the FortiGate and TGW. See Technical Tip: How to check BGP advertised and received routes on a FortiGate for details:
get router info bgp neighbors <neighbor_IP> received-routes
get router info bgp neighbors <neighbor_IP> advertised-routes
In a successful scenario, Customer VPC routes should be visible to the FortiGate via the TGW. You should be able to verify this on both FortiGate instances.
- Verify the TGW BGP status. On the AWS management console, go to VPC Dashboard > Transit Gateways > Transit Gateway Attachments. Select the TGW Connect attachment, then go to the Connect peers tab. Confirm that the TGW BGP 1 and 2 Status display as UP.
- Verify the TGW BGP status for both connect peers in the TGW route table. On the AWS management console, go to VPC Dashboard > Transit Gateways > Transit Gateway Route Tables. Select the default TGW route table, and go to the Routes tab. You should see several propagated routes with the Connect resource type.