HP Advanced Services zl Module with Microsoft® Windows Server® 2008 R2 Planning and Design Guide

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Solution 1: WAN Optimization and Survivability
Solution: HP Advanced Services zl Module with Microsoft Windows Server 2008 R2 + HP AllianceONE Extended Services
at the branch, helping to decrease congestion on the company’s WAN link. In
addition, by supporting basic network services locally, the module protects
branch users’ access to local resources in the case of a WAN failure.
The HP Advanced Services zl Module with Microsoft Windows Server 2008 R2
will provide the following Windows services locally:
 Active Directory—The server running on the module will act as a domain
controller for the local users, allowing the users to log in to the domain
and implementing the domain policies.
 Dynamic Host Configuration Protocol (DHCP)—Most endpoints must receive
their IP settings using DHCP. Providing DHCP at the branch level protects
these endpoints’ network connectivity in the case of a WAN failure.
Keeping DHCP requests local might also eliminate some bursts of traffic
(as users arrive at the office, start up their computers, and request DHCP
settings).
 Domain Name System (DNS)—Providing DNS services at the local level
significantly reduces the number of DNS requests sent through the WAN
and protects users’ connectivity during a WAN failure.
 Internet Information Services (IIS) and File Transfer Protocol (FTP)—The mod-
ule will host whatever Web-based applications the branch requires. It will
also host files on an FTP server.
 Print Services—The module will act as a print server, managing and
monitoring print queues to increase the efficiency.
 File Services—While branch users need to access some centralized
resources, many of the files that they access most often are specific to the
local branch. The module can store such files, delivering them to autho-
rized local users as needed.
The server that is running on module can also host any other applications that
you choose such as antivirus or firewall software. Follow the guidelines given
by the application for deploying it.
The HP AllianceONE Extended Services zl Module with Riverbed® Steelhead
RiOS® will further optimize the WAN link, improving the users’ experience in
accessing the applications and resources that remain at the data center. This
module works with a Riverbed appliance at the main office to decrease latency
and improve Quality of Service (QoS) for selected types of traffic crossing the
WAN.
The application removes repetitive traffic from the WAN by securely storing
transmitted data that can then be accessed locally without the need for
repeated transmissions across the WAN. The Riverbed zl module also signifi-
cantly increases application performance speeds (up to ten times the speed
or more) for a considerable number of critical business applications.