and gateways to provide the required VIPs
GRE Logical Network Used by the gateway for GRE tunneling. Documented in
the gateway documentationOnce deployed, the VM networks are created for each virtual network to which VMs
are then connected, but it works the same as for any other VM network.
MICROSOFT AZURE STACK
SDNv2 is automatically deployed as part of Microsoft Azure Stack, including the
Network Controller, BGP route reflector, gateways, and SLB. Deployment of
configuration is consistent with Azure Resource Manager (ARM), which means
deployment and configuration of networks and services can be performed using the
Azure portal, AzureRM PowerShell, or JSON templates. With Azure Stack, the
underlying plumbing of the SDNv2 is hidden from you, and all actions must be
performed through ARM.
Summary
Some workloads do not work with network virtualization today. PXE boot, which
enables booting an operating system over the network, will not function. DHCP is
supported, but SCVMM has its own switch extension to intercept DHCP to allocate
from IP pools, so standard DHCP in a VM would not work when you’re managing your
network with SCVMM.
To summarize, you can use the following types of isolation methods in your Hyper-V
environment:
Physical Use separate physical network switches and adapters to provide isolation
between networks. Costly, complex, and not scalable.
External Using virtual switch extensions, specifically the forwarding extension
such as Cisco Nexus 1000V or NEC OpenFlow, can provide isolation in the switch
using native technologies. This is, however, fairly opaque to SCVMM.
VLAN Layer 2 technology provides isolation and broadcast boundary on a shared
network, but the number of VLANs is limited and can become complex to manage.
Does not allow IP address overlap between VLANs, nor does it allow flexibility for
business units/tenants to bring their own IP scheme to the environment.
PVLAN Utilizes a pair of VLANs to provide an isolated network in different
modes, but most commonly allows many virtual machines to communicate with a
common set of resources/Internet while being completely isolated from each
other.
Network Virtualization Abstraction of the virtual machine network from the
physical network fabric provides maximum capability without the limitations and
complexity of other technologies. Allows users of network virtualization to bring
their own IP scheme and even IP overlap between different virtual networks.