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vCloud Air® Hybrid Cloud Manager™ Installation and Administration Guide
Page 11
Separate Migration and Data Paths
The Cloud Gateway and the L2C service appliances use different outbound IP addresses. In this configuration, the L2C
appliance data path does not benefit from WAN Optimization or intelligent routing, but workloads travelling through the
Cloud Gateway do. This might not be an issue if the host-to-host traffic on the data path is already encrypted or
compressed.
IP Addresses for Installation: 3 on-premises (HCM, Hybrid Cloud Gateway, L2C), 2 for vCloud Air vDC
Scale Out: Multiple Layer 2 Concentrators for the Data Path
Using multiple L2C appliances is most beneficial if you have secure, high-speed lines, such as a Direct Connect lines, and
you want your architecture to support application performance scale out.
For example, if you have multiple vLANs you might choose to configure an L2C for each vLAN. In this architecture the
L2Cs maintain the data path(s) for host-to-host communication but continues use the Hybrid Cloud Gateway for internal
communication, management tasks, and migration workloads.
IP Addresses for Installation: On premises, 1 each for HCM and HYBRID CLOUD GATEWAY, and 1 for each L2C. In vCloud Air, 1 for the Hybrid Cloud
Gateway, and 1 for each L2C.
Other Architecture Considerations
Egress Path Optimization
Egress Optimization is a feature that applies only to the remote vCloud Air vDC network.
You enable this feature when you configure the Hybrid Cloud Gateway, as shown in Step 5 on page 28.
Intelligent Routing.
This feature applies to any traffic routed over the public internet.
Preparing Your Installation Environment
Before installing Hybrid Cloud Manager, verify that your environment can support the tasks you want to accomplish.
Configure Network Connectivity
The Hybrid Cloud Manager, when installed, must be able to reach the public internet and/or your private line(s), and any
necessary data center elements such as networks, switches, port groups, and VMs you might migrate.
Table 3 lists ports that must be opened so that Hybrid Cloud Manager virtual appliances can install successfully.
Also, both your vSphere environment and your vCloud Air environment must allow for Network Time Protocol (NTP)
clock synchronization among vSphere on-premises devices and the vCloud Air Dedicated Cloud devices. UDP port 123
must be accessible to Hybrid Cloud Manager virtual appliances and networks. If you have installed NTP Servers you can
specify them when you install the Hybrid Cloud Manager appliance (step 11.f on page 15).