300-420 · Question #305
What does the fabric data plane leverage in SD-Access Architecture?
The correct answer is C. MAC-in-IP encapsulation method to transport of the Layer 2 frame. The SD-Access fabric data plane leverages MAC-in-IP encapsulation, specifically VXLAN, to transport Layer 2 frames over the underlying Layer 3 network.
Question
What does the fabric data plane leverage in SD-Access Architecture?
Options
- ALISP protocol to resolve endpoint-to-location mapping
- BIS-IS protocol to exchange link-state routing information
- CMAC-in-IP encapsulation method to transport of the Layer 2 frame
- DBGP protocol to advertise endpoint prefixes outside of the fabric
How the community answered
(34 responses)- A6% (2)
- B3% (1)
- C91% (31)
Why each option
The SD-Access fabric data plane leverages MAC-in-IP encapsulation, specifically VXLAN, to transport Layer 2 frames over the underlying Layer 3 network.
LISP (Locator/ID Separation Protocol) is leveraged by the control plane in SD-Access to resolve endpoint-to-location mappings, not for data plane encapsulation.
IS-IS (or OSPF) is typically used as the interior gateway protocol in the underlay network to exchange link-state routing information, not as the fabric data plane's encapsulation method.
The SD-Access fabric data plane utilizes VXLAN (Virtual Extensible LAN) encapsulation, which is a MAC-in-IP (or more precisely, MAC-in-UDP) tunneling method, to extend Layer 2 segments over a Layer 3 underlay network.
BGP is utilized by border nodes in SD-Access to advertise endpoint prefixes to networks outside the fabric, which is a control plane function related to external routing, not data plane encapsulation.
Concept tested: SD-Access fabric data plane encapsulation
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/sda_design_guide/cda_design_guide/ch2_sda_fabric_design.html
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