300-420 · Question #190
Which two functions does the control plane node provide in a Cisco SD-Access architecture? (Choose two.)
The correct answer is B. host tracking databasepolicy D. map server. In a Cisco SD-Access architecture, the Control Plane node uses LISP to manage host location information and provide mapping services across the fabric.
Question
Which two functions does the control plane node provide in a Cisco SD-Access architecture? (Choose two.)
Options
- ALISP proxy ETR
- Bhost tracking databasepolicy
- Cmapping
- Dmap server
- Eendpoint registration
How the community answered
(61 responses)- A2% (1)
- B92% (56)
- C2% (1)
- E5% (3)
Why each option
In a Cisco SD-Access architecture, the Control Plane node uses LISP to manage host location information and provide mapping services across the fabric.
LISP proxy ETR (PxETR) is a data plane function typically performed by a fabric border node to route traffic to and from non-LISP domains.
The Control Plane node maintains the Host Tracking Database (HTDB), which stores Endpoint ID (EID) to Routing Locator (RLOC) mappings, essentially tracking where all hosts are located within the SD-Access fabric.
While the control plane orchestrates policy application, 'policy mapping' is a general term; the specific core LISP functions of the control plane are related to host tracking and map services.
The Control Plane node in Cisco SD-Access functions as the LISP Map-Server, which is responsible for receiving EID registrations from fabric edge nodes and responding to EID lookup requests from fabric border nodes.
Endpoint registration is a function performed by the fabric edge nodes (ETRs) when they send host reachability information to the Control Plane node (Map-Server).
Concept tested: Cisco SD-Access Control Plane roles (LISP Map-Server/HTDB)
Source: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#_concept_sd_access_network_roles
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