AWS Outposts is a fully managed service that extends AWS infrastructure, AWS services, APIs, and tools to on-premises data center to operate as a hybrid cloud. AWS Outposts is for workloads that require low-latency access to on-premises systems, local data processing, and local data storage.
Customers can use AWS Outposts to launch Amazon Elastic Compute Cloud (EC2) instances, and Amazon Elastic Block Store (EBS) volumes. You can run a range of AWS services locally on Outposts or connect to a broad range of services available in the local AWS region.
AWS Outposts are connected to the data-center network. While AWS Outposts is fully managed by AWS, connectivity and integration with the on-premises network is the key for a successful deployment, and operation.
Each AWS Outpost has two Top-of-Rack (ToR) switches called Outposts Networking Devices1/2. The two switches are connected to two access switches in the customer data-center network with a Link Aggregation Control Protocol (LACP) port channel of multiple member links.
Layer 3 connectivity is established over VLAN interfaces (or L3 sub-interface with dot1q encapsulation) over the port channel. Border Gateway Protocol (BGP) routing runs over the Layer 3 links between AWS Outposts and the customers data-center network.
Figure 1. AWS Outposts Networking
Each AWS Outposts Networking Device establishes two BGP sessions with the customer data-center network. One BGP session is for the service link data path, for example, VLAN 400, with the other BGP session designated for the local data path, such as VLAN 200. The service link data path provides the connectivity between AWS Outposts, and the parent AWS region. This data path must be part of the Layer 3 routing space that is eventually connected to the external routing domain to reach the AWS region. The local datapath is to provide the internal connectivity between AWS Outposts and the customer data center.
The VLAN 400 and VLAN 200 are examples values that are used throughout this document as representing service link and local datapath VLANs.