AMX AV/IT Administrators Guide
Rev. 1.0 (7/29/2014) www.amx.com Page 25
Designated Router (DR): The Designated Router is any multicast router in a network that is
not the Rendezvous Point. The function of a DR is to sends and forwards PIM Join messages to
the Rendezvous Point to initiate a multicast to its networks and if attached to a multicast source,
forward encapsulated multicast packets to the RP for distribution.
Storm Control
Storm control prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast storm
on a port. A LAN storm occurs when packets flood the LAN, creating excessive traffic and degrading
network performance. Storm control uses thresholds to block and then restore the forwarding of
broadcast, unicast, or multicast packets. You can also set the switch to shut down the port when the
threshold is reached.
Storm control only works on inbound packets to a switch port so a careful application where there is a
possibility of a multicast storm.
Because on layer 2, broadcasts are seen as a subset of multicast, when configuring storm control in a
switch port, if you´re setting limits to both multicast and broadcast, you should set multicast limit higher
than the broadcast limit, otherwise both broadcasts and multicasts will be limited by the multicast level.
This is especially important in a spanning tree configuration to not block spanning tree BPDUs.
In AMX’s implementation, multicast clients do not request retransmission of multicast data and are
therefore not likely to cause multicast storms. However, all multicast traffic is suppressed by multicast
storm control, so if video is mission critical then consideration must be made.
Management
RMS Enterprise is scalable client/server based software for IT and AV managers that provides remote
management capabilities for AV assets and building systems. The software features a user-friendly
dashboard making it easy to centralize the management and monitoring of AV equipment, lights, HVAC
and other building functions. It contains an integrated Apache Tomcat web server to provide an intuitive
user interface without requiring local access.
RMS Enterprise supports globally deployed systems by adding support for WAN and Internet based
connections. A client-server communication strategy utilizing a service-oriented architecture (SOA),
supports globally distributed client/endpoint communication.
RMS Enterprise
RMS Enterprise provides large scale management for user and roles, as well for tracking user activities
including an audit trail of who performed each activity and when it was completed. The server software
supports authentication, encryption and protection from cross-site scripting to prevent security threats.
The use of Hibernate and its parameterized queries protects RMS server against SQL injection attacks.
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