Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2ArchitectureHard
A network architect is designing a new campus fabric using Cisco SD-Access. The design includes multiple access layers, distribution layers, and a collapsed core. To ensure that endpoints can roam seamlessly between different access switches while maintaining their IP address and policy, which SD-Access architectural component is primarily responsible for handling host mobility and IP-to-location mapping?
- ABorder Node
- BFabric Edge Node
- CFabric Wireless LAN Controller (WLC)
- DControl Plane Node
Show answer & explanationAnswer & explanation
Correct answer: D. Control Plane Node
The Control Plane Node (typically a Cisco Catalyst 9000 Series switch running LISP) is responsible for maintaining the host database, which maps endpoint identifiers (EIDs) to their current routing locators (RLOCs). This enables seamless host mobility and IP-to-location mapping across the fabric, ensuring endpoints maintain their IP address and policies when moving between different fabric edge nodes.
Why the other options are wrong
- A. The Border Node connects the SD-Access fabric to external networks; it doesn't primarily handle host mobility within the fabric.
- B. The Fabric Edge Node connects endpoints to the fabric and enforces policies, but relies on the Control Plane Node for host mobility information.
- C. The Fabric WLC integrates wireless into the fabric, but the Control Plane Node is the core component for host mobility and IP-to-location mapping for both wired and wireless clients in the fabric.
SD-Access Control Plane Node
A core component in Cisco SD-Access responsible for maintaining the host database (EID-to-RLOC mapping) using LISP, enabling host mobility and IP address persistence within the fabric.
- Based on LISP Map-Server/Map-Resolver functionality.
- Stores information about where endpoints are connected.
- Facilitates seamless roaming and IP address retention for endpoints.
Memory trick: Control Plane 'knows' where everyone is, Border 'guards' the edge.