Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2ArchitectureMedium
A network architect is designing a new campus fabric using Cisco SD-Access. The design specifies that the control plane for the fabric should maintain a mapping system for all endpoints within the fabric, allowing for location-independent addressing and efficient routing. Which specific SD-Access node role is responsible for this function?
- AFabric Border Node
- BFabric Edge Node
- CFabric Control Plane Node
- DFabric Wireless LAN Controller
Show answer & explanationAnswer & explanation
Correct answer: C. Fabric Control Plane Node
The Fabric Control Plane Node in Cisco SD-Access is responsible for maintaining the mapping system (using LISP Map-Server/Map-Resolver) that tracks the location of endpoints within the fabric. This allows for location-independent addressing and efficient routing of traffic to endpoints regardless of their physical attachment point.
Why the other options are wrong
- A. Fabric Border Nodes connect the SD-Access fabric to external networks, acting as a gateway.
- B. Fabric Edge Nodes connect endpoints to the fabric and encapsulate traffic, but they do not maintain the global mapping system.
- D. Fabric Wireless LAN Controllers integrate wireless access points into the fabric, but the control plane mapping is handled by a dedicated node role.
SD-Access Control Plane Node
In Cisco SD-Access, this node role acts as the LISP Map-Server and Map-Resolver, maintaining a database of endpoint-to-location mappings for all devices within the fabric.
- Uses LISP (Locator/ID Separation Protocol) for mapping.
- Separates endpoint identity (EID) from routing locator (RLOC).
- Enables host mobility and location-independent addressing.
- Essential for efficient forwarding within the fabric.
Memory trick: SD-Access Nodes: Edge for clients, Border for outside, Control for maps.