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THE RECOMMENDED LAYOUT
The layout shown below has been found to provide the most efficient network layout for rapid throughput when using IGMP
snooping:
Note: From firmware version 3.1, tree and hierarchical structures of network switches are also supported. The Transmitter now
joins its own multicast group so there is always a route from the querier to the transmitter which was previously missing in
earlier firmware versions.
• Use no more than two cascade levels.
• Ensure high bandwidth between the two L2 switches and very high bandwidth between the top L2 and the L3. Typically 10GB
and 20GB, respectively for 48 port L2 switches.
CONFIGURING THE SWITCHES AND DEVICES
The layout is vital but so too is the configuration:
• Enable
on all L2 switches.
• Ensure that
is enabled on all switches with Agility units connected directly to them.
• Enable the L3 switch as an
.
• Enable
on all switches and importantly also enable portfast (only) on all switch ports that have
Agility units connected.
• If any hosts will use any video resolutions using 2048 horizontal pixels (e.g. 2048 x 1152), ensure that
are
enabled on all switches.
• Choose an appropriate forwarding mode on all switches. Use
• Optimize the settings on the Agility transmitters:
• If moving video images are being shown frequently, then leave Frame Skipping at a low percentage and instead reduce the
Peak bandwidth limiter.
• Where screens are quite static, try increasing the Background Refresh interval and/or increasing the Frame skipping
percentage setting.
Make changes to the Agility transmitters one at a time, in small steps, and view typical video images so that you can attribute
positive or negative results to the appropriate control.
• Ensure that all Agility units are fully updated to the latest firmware version (at least v2.1).