1.0

vCloud Air® Hybrid Cloud Manager™ Installation and Administration Guide
Page 10
Migration Only
In Table 2, cases ❶ and ❷ are for migrating without an L2 extension. Other than the Hybrid Cloud Manager, only the
Hybrid Cloud Gateway appliance is required. The basic difference between cases
❶ and ❷ is that higher speed is
possible with the Hybrid Networking Premium option.
WAN optimization, if installed, can improve security and speed in the situations described in “WAN Optimizer” on page
8. If you have a secure high-speed line (for example, Direct Connect), configuring the Hybrid Cloud Gateway to use that
line is another way to improve speed.
One advantage of migrating virtual machines on extended networks into vCloud Air is that the downtime is reduced to a
few minutes and no configuration changes happen on the virtual machine. The virtual machine can retain the MAC
addresses, computer names and VM names – greatly simplifying the migration to vCloud Air and enabling easy round
trips back on-premise, when needed. The Network Extension feature requires a vSphere Distributed Switch, which
requires vSphere Enterprise Plus Edition.
It is possible to migrate virtual machines without network extension. In this case the virtual machine obtains a new IP
address via the Guest Customization service once it is migrated.
IP Addresses for Installation: 2 on-premises, 1 for vCloud Air vDC
Layer 2 Extension
Before you configure L2 network extension, you must be certain that you have the prerequisites, as explained in, “Verify
Layer 2 Installation Requirements.”
Use cases 3-7 rely upon Layer 2 Extension. You can view Layer 2 Extensions as a way to extend or stretch your on-
premises network to vCloud Air, enabling seamless VM migration between the data center and the cloud. For example,
suppose you have an application and a database on separate hosts in your vCenter, and you migrate the application into
the Cloud.
• If you are using Hybrid Transport in the deployment wizard (single path approach), the migration and extended
network traffic is routed through the Cloud Gateway. WAN optimization (if installed) and intelligent routing will be
applied to migration workloads and the extended network data path.
• If the migration path and the data path are separate (cases 5, 6, and 7), the Cloud Gateway still maintains the secure
channel and handles migration workloads, which get the benefits of WAN optimization (if installed). The extended
network data traffic between virtual machines travels on the routes configured for the Layer 2 Concentrator(s).
The remainder of this section summarizes how L2C configuration affects the Layer 2 Extension use cases.
Single Path
This is the default service appliance deployment, where the L2C and WAN optimization appliances use the same IP
address as the Cloud Gateway.
IP Addresses for Installation: 2 on-premises (HCM, Hybrid Cloud Gateway), 1 for vCloud Air vDC