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Figure 2-69:
RAS Gateway pools 
More info RAS Gateway Multitenant BGP Routing is a complex area for discussion and is 
constantly changing. To view the latest information, go to 
https://technet.microsoft.com/ 
library/mt679502.aspx
. 
Software Load Balancing 
Windows Server 2016 introduces Software Load Balancing, which provides HA and scalability to 
tenant workloads. Software Load Balancing includes the following features: 

Layer 4 (L4) load balancing services for “North-South” and “East-West” TCP/UDP traffic.

Public and internal network traffic load balancing. 

Supports dynamic IP addresses onVLANs and on virtual networks that you create by using Hyper-
V Network Virtualization. 

Health probe support. 

Ready for cloud scale, including scale-out capability and scale-up capability for multiplexers and 
host agents. 
Software Load Balancing has been specifically designed to handle throughput on a scale of tens of 
gigabytes per cluster, making this a viable alternative to traditional hardware load balancers. 
Before we dive into Software Load Balancing, let’s define a few terms: 

Virtual IP address This is the IP to which external connections will route. 

Dynamic IP address This is the set of IPs on the VMs backing the service. 

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CHAPTER 2 | Software-defined datacenter 
When you have a service that requires Software Load Balancing, Network Controller is notified of the 
request and provisions a Software Load Balancing multiplexer. You can have several different 
multiplexers in an environment. Each multiplexer will be assigned a virtual IP address. The BGP then 
announces the virtual IP address to the network. The multiplexer is also responsible for accepting 
connections and routing them to the VMs backing the service. Because the virtual IP address is 
announced through BGP and is controlled by Network Controller, in the event of a multiplexer failure, 
Network Controller has the ability to recover by initiating a new multiplexer and reannouncing the 
routes through BGP. Figure 2-70 shows the Software Load Balancing architecture.