NetBalancer
Technical Documentation User Guide V5.1
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Policy-Based Load
Balancing Software
Transparently distribute
client traffic to Web server farms
Distribution of traffic according to individual server capabilities
Assure 100% uptime by automatically rerouting down-server traffic
Web and other Internet-based server farms are a critical company resource.
However, increased complexity of server farms and the need for improved
server performance have created the need for network managers to more
efficiently control and distribute server traffic.
Policy-Powered Networking
The Allot NetEnforcer® allows you to define advanced load balancing
policies that reflect the capabilities of individual servers on your network.
Using advanced load balancing and traffic management algorithms, the NetEnforcer
continuously adjusts both the flow and prioritization of applications
through the network and the distribution of those applications to servers
resulting in efficient, optimized traffic throughout the network.
The NetEnforcer allows
you to control and balance traffic to enterprise, corporate, and service
provider server farms. It examines all user traffic and, when appropriate,
redirects traffic to the appropriate server according to centrally defined
policies. It then goes beyond traditional load balancing equipment by
allowing you to define single policies that control both the prioritization
of applications on the network and the distribution of those applications
to servers.
Figure 1. Load-Balancing
Network Configuration
Simplify Changes to Your Server Farm
Using the NetEnforcer, you can avoid inherent problems associated with
adds, moves, and changes to your Internet server farm. For example, the
NetEnforcer allows you to grow your network as required while minimizing
changes. You can add a new server to your current server farm while retaining
the capabilities of your current servers. You can remove or upgrade servers
without changing your basic network configurations. You simply instruct
the NetEnforcer to understand the new changes.
If problems arise
on your network, the NetEnforcer will automatically reroute traffic around
a down server or, alternatively, send a message back to the client telling
the user the reason for the outage. Additionally, you can bring your servers
down for maintenance while maintaining connectivity to the rest of your
server farm.
Define Load-Balancing
Conditions and Actions
As server needs and demands grow, the NetEnforcer lets network managers
seamlessly add servers and distribute traffic according to the individual
capabilities of each server.
Specifically, the
NetEnforcer allows the definition of network traffic as broadly and narrowly
as needed using conditions such as network addresses, TCP Ports, time-of-day,
and Web content type.
Policies can be defined
to reflect the individual capabilities of each server. For example, policies
can be defined to redirect all video to the video server, all Web traffic
to the Web server, and all employees in marketing to the marketing server.
Traffic that flows
through the NetEnforcer and matches the defined policy will result in
the traffic being automatically rerouted from the NetEnforcer to the specific
server that best meets the capabilities defined by the policy. Traffic
can then be balanced between available servers using algorithms such as:
Round-Robin whereby
each server will be treated with equal priority.
Weighted Round-Robin whereby each server can be given an individual weight
or priority based on its ability to deliver specific applications.
Integrated Services
The Allot Communications NetBalancer module is part of the Allot Policy-based
Networking System that includes integrated bandwidth management, access
control, cache redirection, network monitoring as well as server load
balancing. By deploying this type of integrated solution, network managers
use the same rules and policies to control the entire flow of traffic
through the server farm, local network and the WAN or Internet.
Summary
Server load balancing provides valuable benefits by improving network
and server performance. Using Allot Communications' NetBalancer Module,
network managers can improve the user experience by distributing overall
server load, limiting administration costs of server configuration, and
enforcing centrally defined server policies. The NetBalancer Module, used
in conjunction with the NetEnforcer bandwidth management products, provides
an optimal system for maximizing the use of Internet and WAN links using
common policies defined according to the needs and requirements of the
network users.
Ordering Information
Part No./Model Device
Supported
SNB-202
NetEnforcer AC-202 (all bandwidths)
SNB-402
NetEnforcer AC-402 (all bandwidths)
SNB-601
NetEnforcer AC-601
SNB-802
NetEnforcer AC-802 (all bandwidths)
SNB-601/SP
NetEnforcer AC-601/SP
SNB-802/SP
NetEnforcer AC-802/SP (all bandwidths)
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