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

Match each software-defined networking component on the left with its primary architectural function within an enterprise fabric infrastructure on the right.

  • VXLANEncapsulates Layer 2 and Layer 3 payload frames inside UDP packets for overlay transport.
  • Underlay IGP (e.g., IS-IS / OSPF)Establishes physical IP reachability between routing locators (RLOCs) and VTEP loopbacks.
  • LISP Control PlaneMaintains mapping database tracking host endpoint identifiers (EIDs) to routing locators (RLOCs).
  • Fabric Edge NodeConnects end-user devices to the fabric and performs endpoint identification and authentication.

Cevap

VXLAN pairs with UDP payload encapsulation; Underlay IGP pairs with physical IP reachability between RLOCs; LISP Control Plane pairs with maintaining EID-to-RLOC mapping database; Fabric Edge Node pairs with connecting and authenticating end-user devices.
VXLAN handles data plane encapsulation over UDP, Underlay IGPs handle physical IP reachability, LISP handles the control plane mapping database between EIDs and RLOCs, and Fabric Edge nodes connect endpoints to the fabric network.

Adım Adım Çözüm

1
Identify the data plane overlay encapsulation mechanism.
VXLAN encapsulates host traffic inside UDP headers to create virtual overlays over the physical underlay.
Overlay data plane transport relies on encapsulation protocols like VXLAN.
2
Identify the physical network reachability mechanism.
Underlay routing protocols (like IS-IS or OSPF) ensure basic IP reachability between physical nodes and loopback interfaces.
Without underlay IP connectivity, tunnel endpoints cannot exchange encapsulated packets.
3
Identify the mapping database and control plane protocol.
LISP handles the mapping of host Endpoint Identifiers (EIDs) to switch Routing Locators (RLOCs).
LISP replaces traditional MAC learning with a query/response mapping database approach.
4
Identify the fabric device role responsible for host onboarding.
Fabric Edge Nodes connect directly to endpoints, authenticate users, and encapsulate host traffic into the fabric overlay.
Fabric Edge switches act as the entry point into the software-defined access fabric.

Anahtar Kavram

Software-Defined Architectures: Overlay, Underlay, and Fabric protocol roles
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Software-Defined Architectures: Overlay, Underlay, and Fabric

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