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AWS Direct Connect (DX) Highlights

AWS Direct Connect:

Private connection to transfer data between AWS Cloud and on-premise data center

You need a local DX partner to using DX. You connect to the DX partner via fiber optic link. This is a physical link. In the physical link, you can create many virtual interfaces to connect to AWS VPC or AWS Services.

AWS DX support dedicated connection with 1Gbps and 10 Gbps

1Gbps or higher: Work with AWS Partner Network or network provider to connect DX location.

Less than 1Gbps: Work with AWS Partner Network who can create hosted connection for you.

AWS DX support hosted connection capabilities of 1, 2, 5, 10 Gbps.

Support AWS Transit Gateway, aside from configuring site-to-site VPN connections.

Common use cases:

Transfer large datasets

Hybrid cloud to satisfy regulatory requirements of private connectivity

Develop and run real-time application data feeds

Tech Specification

Virtual interfaces is a logical channel that divided from physical dx link. You must create a virtual interface to begin using your DX connection. There are 2 types of virtual interfaces:

Virtual Private interface: Connect to AWS VPC. One private virtual interface for each VPC or you can use AWS DX Gateway.

Virtual Public interface: Connect to AWS public services such as S3, DynamoDB

To access public resources on the remote AWS location, you have to setup public virtual interface and enable BGP session.

Autonomous System Number (ASN) are used to identify networks that present a clearly defined external routing policy to the Internet.

MTU (Maximum Transmission Unit):

Virtual private interface: 1500 or 9001 (jumbo frames)

Transit virtual interface for VPC transit gateway: 1500 or 8500 (jumbo frames)

Virtual public interface: does not support jumbo frames

LAG (Link Aggregation Group) group multiple DX connection into a single, managed connection.

All connection in a LAG has same connection bandwidth

Maximum connections in a LAG: 4

All connections in the LAG must terminate at the same DX endpoint

All connection is a LAG working in active/active mode

Only available for dedicated 1G or 10GB connections

DX Gateway is to use to connect multiple VPC in same or different AWS Regions via virtual private interface.

DX Gateway is global available resource

Enable to connect your on-premise data center to any AWS region (except China region).

Can associate up to 10 VPC in different accounts with DX Gateway. The accounts must be in same AWS payer account ID.

Monitoring

CloudTrail captures all API calls for DX as events

Setup CloudWatch alarms to monitor metrics.

You also can use tags for DX.

Pricing:

Network ports you use and data transfer over the connection

Pricing is per hour consumed per each port type.

Data transfer out will be charged per GB

Data transfer in is free in all locations

Limitations

SpecificationLimitRemarksVirtual interfaces per dedicated connection50Hard limitTransit virtual interface per dedicated connection1Hard limitVirtual interfaces per hosted connection1Hard limitActive DX connection per Region per Account10LAGs50Routes per BGP session on private VIF100Hard limitRoutes per BGP session on public VIF1,000Hard limitDedicated connections per LAG4LAGs per Region10DX Gateway per Account200Virtual private Gateway per DX Gateway10Hard limitvirtual interfaces (private or transit) per DX Gateway30

AWS Direct Connect limitations

Reference:

https://docs.aws.amazon.com/directconnect/latest/UserGuide/limits.html