An SD-WAN Edge in a data center can act as a hub to direct traffic to/from branches. The SD-WAN Edge can be used to manage both MPLS and Internet traffic. The hub in a data center can be configured in a one-arm or two-arm configuration. In addition, a data center can be used as a backup.
The following describes the various designs with different options of how SD-WAN Edge can be inserted into the topology.
| Option | Description |
|---|---|
| Hub 1 | Data Center or regional hub site with SD-WAN Edge deployed in two-arm topology. |
| Hub 2 | Data Center or regional hub site with SD-WAN Edge deployed in one-arm topology (same interface carries multiple WAN links). |
| Legacy 1 and 2 | Classic MPLS sites. |
| Silver 1 | SD-WAN Edge is deployed off-path. SD-WAN Edge creates overlay across both MPLS and Internet paths. Traffic is first diverted to the SD-WAN Edge. |
| Silver 2 | SD-WAN Edge is deployed in-path as the default gateway. It is always the default gateway. This topology is simpler but makes SD-WAN Edge a single point of failure and may require HA. |
| Bronze 1 | Dual-Internet site (one of the links is behind a NAT router). |
