Dell Networking S6000 System Manual de usuario descargar pdf (Pagina 9)

9 Network Virtualization with Dell Infrastructure and VMware NSX | Version 1.2

5 Network Virtualization with VMware NSX

VMware NSX is VMware’s network virtualization technology and allows for the decoupling of network

services from the physical infrastructure. Overlay logical networks are created on top of a basic L2 or L3

physical infrastructure (underlay). Overlay logical networks are created using VXLAN, a L2 in L3 tunneling

protocol (overlay).

In addition to the ability to decouple networking from the physical underlying hardware via logical

networks, the NSX platform also provides for network services in the logical space as shown in Figure 3

below. Some of these logical services include switching, distributed routing, firewall, load balancing,

DHCP, NAT, and VPN capabilities. Further, NSX also provides the capabilities of third party integration via

NSX Service Composer. NSX Service Composer is provided via NSX Manager vCenter plug-in and allows

for automating the consumption of services and their mapping to virtual machines using a logical policy.

Figure 3 VMware NSX virtualization platform on Dell hardware (vSphere-only environment)

A logical switch is an abstraction of a physical switch. It is important to understand that a logical switch is

not the same as a standard vSwitch or Distributed Virtual Switch (VDS). A logical switch is implemented via

network overlay technology making it independent of the underlying physical infrastructure and results in

an overlay logical network. A traditional standard vSwitch or VDS results in a bridged logical network that

uses VLANs. Both overlay logical networks and bridged logical networks can co-exist within the same

environment.

Once an overlay logical switch/network is created, VMs can be directly connected and completely

separated from the physical network (underlay). Another advantage of overlay logical switches/networks is

that it enables multi-tenancy and provides address isolation; tenants can be separated via different logical

networks as shown below in Figure 4 where a VNI identifies a logical switch. To keep wording simplified

and to cut down on verbosity, in this whitepaper, logical switch/network refers to an overlay logical

switch/network.

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Dell Networking S6000 System Manual de usuario Pagina 9