This article describes how to plan your networking fabric in System Center - Virtual Machine Manager (VMM).
Networking components
VMM networking contains a number of components, summarized in the following table:
Maintaining and Changing the MAC Address of a Virtual Machine When a virtual machine is powered on, VMware Workstation automatically assigns each of its virtual network adapters an Ethernet MAC address. MAC stands for media access control. A MAC address is the unique address assigned to each Ethernet network device.
Plan logical networks
During deployment you'll need to create logical networks and set up network sites and IP addressing in each network. Then you'll create VM networks based on those logical networks.
Here's what you'll need to plan:
Here's what you'll need to do:
Plan logical networks, network sites, and IP address pools
Use the following table to plan for the logical networks, VM networks, and IP address pools you will need to support a virtualized infrastructure.
Logical networks created by default
In the VMM console, Fabric >Networking > Logical networks, you might see logical networks created by VMM by default. VMM creates these networks to ensure that when you add a host, you have at least one logical network for deploying virtual machines and services. No network sites are created automatically.
To illustrate how these settings work, suppose that you have not changed the settings, and you add a Hyper-V host to VMM management. In this case, VMM automatically creates logical networks that match the first DNS suffix label of the connection-specific DNS suffix on each host network adapter. On the logical network,VMM also creates a VM network that is configured with “no isolation.” For example, if the DNS suffix for the host network adapter was corp.contoso.com, VMM would create a logical network named “corp,” and on it, a VM network named “corp” that is configured with no isolation.
Guidelines for network sites: VLAN and IP subnet settings
The main guideline specifying VLANs and IP subnets for network sites is to reflect your network topology. For details, see the following table.
Note
Network sites are sometimes referred to as 'logical network definitions,' for example, in Windows PowerShell commands.
Note
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For an external network, that is, a network managed through a vendor network-management console or virtual switch extension manager outside of VMM, you can configure settings through the vendor network-management console, and allow them to be imported from the vendor network-management database into VMM.
Guidelines for IP address pools
In general, create IP address pools where you will use static IP addressing or load balancing; also create IP address pools on logical networks that will be the foundation for VM networks supporting network virtualization. VMM uses IP address pools to assign IP addresses to Hyper-V hosts that you deploy through VMM, and to Windows-based virtual machines that you deploy through VMM, regardless of the type of host they are running on (Hyper-V or VMware ESX).
The following table provides detailed guidelines. Additional information about IP address pools is provided after the table.
Important
If you configure a virtual machine to obtain a static IP address from an IP address pool, you must also configure the virtual machine to use a static MAC address. You can either specify the MAC address manually (during the Configure Settings step) or have VMM automatically assign a MAC address from a MAC address pool.
This requirement for static MAC addresses is necessary because VMM uses the MAC address to identify which network adapter to set the static IP address to, and this identification must happen before the virtual machine starts. Identifying the network adapter is especially important if a virtual machine has multiple adapters. If the MAC addresses were assigned dynamically through Hyper-V, VMM could not consistently identify the correct adapter to set a static IP address on.
How Many Mac Addresses Are Available For Virtual Network Adapters Created By Hyper-v By Default
VMM provides static MAC address pools by default, but you can customize the pools. VMM provides static MAC address pools by default, but you can customize the pools.
Note
After a virtual machine has been deployed in VMM, you can view the IP address or addresses assigned to that virtual machine. To do this, right-click the listing for the virtual machine, click Properties, click the Hardware Configuration tab, click the network adapter, and in the results pane, click Connection details.
How Many Mac Addresses Are Available For Virtual Network Adapters Created By Hyper-vNext stepsComments are closed.
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