SDN

In the Ultra Transcenders books

2V0-13.25

Each book explains SDN in context, with comparison tables and the common traps.

Terms in this definition

• VXLAN

  Encapsulation of layer 2 frames in UDP on port 4789. Gateway Load Balancer chains NVAs with it, and Azure Extended Network uses it to carry a stretched subnet between its pair of appliances.

• VMware Cloud Foundation

  Broadcom's platform for private cloud. It unifies management of NSX, vSAN, vSphere, VCF Automation and VCF Operations as one fleet; VVF, by contrast, lacks automation and cloud management.

• Topology

  A Network Watcher view diagramming the resources in a VNet and how they relate. Traffic and packets are not shown.

Related terms

• Data centre network fabric

  The underlying physical switching for VCF. Any topology is acceptable, whether leaf-spine with hardware SDN like BGP-EVPN, plain leaf-spine or three-tier, as long as it is data-centre class and supplies whatever stretched networks, gateways, MTU and VLANs the selected single-rack, multi-rack or multi availability zone fabric model calls for.

• EVPN

  Ethernet VPN: often combined with VXLAN in data centre networks, this standard uses BGP as a control plane to deliver Layer 2 and Layer 3 services across an IP underlay. VCF treats leaf-spine with BGP-EVPN as its hardware SDN fabric option, which offers identical VLANs in every rack.

• LBFO

  The classic Windows Server teaming feature, which joins several network adapters together to add throughput and survive an adapter failure. Hyper-V and software-defined networking hosts should use Switch Embedded Teaming in its place.

• Network Controller

  Server role in Windows Server SDN that provides central management of the virtual network infrastructure.

• VXLAN

  Layer 2 over layer 3 encapsulation standard. NSX's overlay is Geneve-based, so in VCF VXLAN shows up in hardware SDN fabrics using BGP-EVPN, where it can extend VLANs between racks for Layer 2 multi-rack clusters.