Purpose of an Edge Node in an SD-Access Network Fabric

A.

Sure, I'd be happy to provide a detailed explanation of the purpose of an edge node in an SD-Access network fabric.

Software-Defined Access (SD-Access) is a Cisco architecture that simplifies network management and provides a consistent user experience across wired and wireless networks. In an SD-Access network fabric, an edge node plays a critical role in connecting endpoints, such as desktops, laptops, and IoT devices, to the fabric.

The purpose of an edge node in an SD-Access network fabric is primarily to identify and authenticate endpoints and register endpoint information with control plane nodes. Endpoint identification and authentication are essential for network security and access control. Edge nodes are responsible for verifying endpoint credentials, such as MAC or IP addresses, and ensuring that only authorized devices are allowed to connect to the network fabric.

Once an endpoint is authenticated, the edge node registers endpoint information, including the endpoint's identity, location, and security attributes, with the control plane nodes. The control plane nodes use this information to make forwarding decisions and enforce network policies. In other words, edge nodes act as the first line of defense for the network fabric, ensuring that only authorized and authenticated endpoints are allowed to communicate within the fabric.

In addition to endpoint authentication and registration, edge nodes also track endpoint IDs to location mappings, along with IPv4, IPv6, or MAC addresses. This information is used to enable network services, such as Quality of Service (QoS) and network segmentation. For example, edge nodes can use the endpoint's location information to apply QoS policies based on the type of traffic and the endpoint's priority level.

Finally, edge nodes also act as the gateway between the fabric domain and the network outside of the fabric. They provide connectivity to non-fabric devices, such as servers or other external networks. This allows the fabric to extend beyond the local network and connect to other networks or cloud services.

To summarize, the purpose of an edge node in an SD-Access network fabric is to:

1. Identify and authenticate endpoints and register endpoint information with control plane nodes
2. Track endpoint IDs to location mappings, along with IPv4, IPv6, or MAC addresses
3. Act as the gateway between the fabric domain and the network outside of the fabric.