Author: Antxon Gonzalez

VM networks are Virtual Networks virtual networks that use a VLAN tag on top of the Hypervisorhypervisor's Network Interfaces network interfaces on the physical Networknetwork.

The Physical Network Interfaces physical network interfaces belong to a Network Service Type network service type (NST), which identifies the network segment that the interface is connected to.

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Racks

Before you add a Physical Machine to physical machine to a Datacenterdatacenter, you need to create the Rack rack it will belong to.

A rack is a logical set of Physical Machines physical machines providing the same level of compute service.

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This pool is used to provide Private private networks to Virtual Datacentersvirtual datacenters.

Network service type

Every time you add a Physical Machinephysical machine, you must choose its Rack rack and specify the Network Service Type network service type (NST) its network interfaces are connected to.

A An NST is a set of interfaces providing the same network service level. You may think that of each NST is as a different network segment.

VLANs inside a an NST have the same meaning for interfaces in the same rack, while VLANs will be different for interfaces in different NSTs or Racksracks.

This does not imply that VLANs inside a NST are interconnected, as this depends on the VLAN type.

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Cloud networks

Cloud Networks networks in Abiquo are defined by their type, network service type (NST), and VLAN tag. This means that all VMs using a network will run on hypervisors with NICs of the corresponding NST.

There will always be a default NST that we call the Service Network, which is the NST that will hold most of the networking workload.

There are three different kind of networks:

• Private: Bound to the Virtual Datacenter virtual datacenter (VDC) they were created in.
  The VLAN tag is taken from the VLAN pool of a rack automatically, bounding the network workload to it.

• External: Bound to a Datacenter and an Enterprisedatacenter and a cloud tenant (enterprise).
  This means that the network VLAN tag has the same meaning for all racks in the Datacenterdatacenter.

• Public: Bound to a Datacenter datacenter only.
  They are similar to external networks, but more than one enterprise may use them.

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VMs in the same enterprise may communicate through public and external networks, or private networks is if they belong to the same VDC.

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