November 2013 AOS Release 6.4.6.R01 Release Notes
Application Fluency Features
VDI Support
The Virtual Desktop Infrastructure (VDI) solution transforms desktops and applications into a secure on
demand service which can be accessed by users anywhere. It optimizes the delivery of desktops,
applications and data to users.
The Citrix XenDesktop is the desktop virtualization solution which includes all the capabilities required to
deliver desktops, applications, and data securely to every user in an enterprise. With centrally deployed
secure remote access to PCs on a corporate network it gives users fast, high-fidelity remote access to
corporate applications and data.
The OmniSwitch identifies and gives proper QoS settings for the virtual desktop applications. The one
touch QoS allows configuring and managing the Citrix VDI traffic priority and services.
A maximum of five ports can be configured for the Citrix VDI (4 TCP and 1 UDP).
Traffic type prioritization are based on the source or destination and TCP or UDP ports 16501, 2596, 2597,
2598, 2599 and user configured ports for Citrix environment. Traffic type prioritization can also be
configured for non-Citrix VDI environment.
mDNS Relay
MDNS is a zero configuration host name resolution service used to discover services on a LAN. MDNS
allows resolving host names to IP addresses within small networks without the need of a conventional DNS
server. The mDNS protocol uses IP multicast User Datagram Protocol (UDP) packets and is implemented
by Apple Bonjour, Avahi (LGPL), and Linux NSS-MDNS. To resolve a host name, the mDNS client
broadcasts a query message asking the host having that name to identify itself. The target machine then
multicasts a message that includes its IP address. All machines in that subnet will use that information to
update their mDNS caches.
As an example Apple's Bonjour architecture implements the following three fundamental operations to
support zero configuration networking service:
• Publication (Advertising a service)
• Discovery (Browsing for available services)
• Resolution (Translating service instance names to address and port numbers for use)
The Aruba AirGroup feature provides optimization that limits the unnecessary flooding of Bonjour traffic
to improve Wifi performance and also allow the Bonjour services to extend across VLANs. The
OmniSwitch enhancement supports an mDNS relay function by configuring a GRE tunnel interface
between the WLAN controller and the OmniSwitch. The OmniSwitch can intercept and relay the mDNS
frames from the wired devices advertising a service using Bonjour messages to the WLAN controller thus
preventing flooding of the mDNS frames.
Note: mDNS relay is only supported for wirless clients. Wired clients are not supported.
Page 16 of 80 OmniSwitch 6850E/6855/9000E—Release 6.4.6.R01
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