Underlay Network
Underlay
- The Underlay is the underlying physical network which the Overlay Network is built on top of in an SD-Access network.
- When combined, they form the Fabric
Any configuration can be used for the underlying physical network
1. Links between devices can be Layer 2 or Layer 3 and any routing protocol can be used
2. DNA center can be used to automatically provision the underlay network in new ('greenfield') sites
1. In this case, Layer 3 links are used between devices and IS-IS is used as the routing protocol