Step-By-Step Guide: Configuring Hyper-V and Failover Clustering for Windows Server 2008 R2 on the HP ProLiant DL980, rev 1

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Step 3: Create a Virtual Network
Important
You will need to perform this step on both physical computers if you did not
create the virtual network when you installed the Hyper-V role; see “Step 2:
Install Hyper-V and Failover Clustering on Both Physical Computers” (on page
8
).
This virtual network provides the highly available virtual machine with access to the physical network.
To create a virtual network, follow these steps:
1. Open Hyper-V Manager.
2. Select the server on the left pane.
3. From the Actions menu, click Virtual Network Manager.
4. Under Create virtual network, select External.
5. Click Add. The New Virtual Network page appears.
6. Type a name for the new virtual network switch.
7. Under Connection Type, click External and then select the physical network adapter.