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Zorluk: OrtaSoftware-Defined Architectures: Overlay, Underlay, and Fabric

An enterprise network is deploying a Cisco Software-Defined Access (SD-Access) architecture. The network engineering team needs to configure routing protocols to ensure physical IP reachability among all switch loopback addresses used as Routing Locators (RLOCs). Which architectural layer is specifically responsible for establishing this underlying Layer 3 transport infrastructure?

  1. Underlay networkCevap
  2. B
    Overlay network
  3. C
    Fabric control plane
  4. D
    Virtual Extensible LAN (VXLAN)

Cevap

The underlay network is responsible for providing foundational physical Layer 3 IP reachability between all fabric nodes.
The underlay network consists of the physical network hardware, interconnecting links, and Layer 3 routing protocols (such as OSPF, IS-IS, or BGP) configured to ensure complete unicast IP reachability between all fabric nodes and RLOC interfaces. It serves as the physical backbone required to transport overlay encapsulated traffic.

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1
Identify the requirement described in the scenario
The requirement asks for the network component providing physical IP routing reachability among switch loopback interface addresses (RLOCs).
Before overlay tunnels can be established, physical IP connectivity must be established across the hardware devices.
2
Compare the roles of underlay, overlay, fabric control plane, and data plane encapsulation
The underlay network uses standard IGP routing (like OSPF or IS-IS) to route IP packets between physical devices and RLOCs. The overlay network operates on top of the underlay.
Without the underlay providing IP connectivity, VXLAN encapsulation and LISP control plane communication cannot function.

Anahtar Kavram

Distinction between Underlay Network, Overlay Network, and Fabric Control Plane in Software-Defined Architectures
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Konular

Software-Defined Architectures: Overlay, Underlay, and Fabric

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