On which protocol or technology is the fabric data plane based in Cisco SD-Access fabric?

Question

Options

• ALISP
• BIS-IS
• CCisco TrustSec
• DVXLAN

• B
  6% (2)
• C
  3% (1)
• D
  91% (32)

Explanation

Cisco SD-Access Fabric Data Plane

VXLAN (Virtual Extensible LAN) serves as the data plane encapsulation technology in Cisco SD-Access, carrying the actual user traffic across the fabric by tunneling Layer 2 and Layer 3 traffic within UDP packets - this allows the overlay network to transport endpoint data efficiently regardless of the underlying physical topology.

• LISP (A) is incorrect because it functions as the control plane protocol in SD-Access, responsible for mapping endpoint IDs (EIDs) to routing locators (RLOCs), not for forwarding actual data traffic.
• IS-IS (B) is incorrect because it operates as the underlay routing protocol, building the physical IP network that VXLAN tunnels ride on top of.
• Cisco TrustSec (C) is incorrect because it provides the policy plane through Scalable Group Tags (SGTs), enforcing segmentation and access control - not data forwarding.

Memory Tip: Think of SD-Access in three layers - "C-L-V": Cisco TrustSec = Policy, LISP = Control, VXLAN = Data. VXLAN is the "vehicle" that actually carries the data across the fabric.

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