Design Guide – DOC. 7977F DM NVX System • 23
For additional information about deploying security with Crestron products, refer to the
IP Considerations Guidelines for the IT Professional Design Guide (Doc. 4579) at
www.crestron.com/manuals
and to Answer ID 5571 in the Online Help section of the
Crestron website (www.crestron.com/onlinehelp).
Network Design Considerations
Consider and apply the following network design best practices:
• Use nonblocking Layer 3 switches with port-based QoS such as 802.1P with
802.1Q at all stages of the design. Use sufficient switch bandwidth and port
speeds. Less expensive switches cause loss of capability in the network.
• Choose switches with sufficient bandwidth at each segment—from edge to
core—to accommodate a nonblocking architecture for DM NVX endpoints and
any additional needs.
• Choose an appropriate network topology. Consider the network, including basic
functionality and redundancy, and whether video walls or repetitive display
signage is necessary. When planning a topology for the network, ensure that
network IT staff and network architects are involved in the decisions.
• Enable an IGMP querier on at least one switch in the DM NVX network. The IGMP
querier ensures that all switches know which multicast transmitters and receivers
are connected to which switches in the network. Enabling an IGMP querier on
multiple switches causes the switch with the lowest value of IP source address to
take priority and act as the querier.
• Consult the network switch manufacturer’s documentation to ensure that the
uplinks are properly configured to support multicast traffic.
• Use switches that support 802.1X for endpoint authentication by implementing
802.1X endpoint authentication through TLS or MS-CHAP v2. Only authorized
endpoints can communicate with the network.
• Ensure that VLANs or MPLS are implemented correctly. Leveraging existing
switch infrastructure with VLANs or MPLS can cause conflicts with network
provisioning needs. If a dedicated DM NVX network is not going to be used,
VLANs must be implemented correctly with their own IP subnet, and MPLS
networks must be configured correctly.
• Account for even-numbered DM NVX primary stream multicast address
assignments since both primary and secondary multicast streams are possible.
The assignment of multicast IP addresses for primary streams should be even
numbered to allow the secondary stream to be assigned to the odd-numbered IP
address, which is one higher than the primary stream’s IP address. For multicast
IP address assignment, refer to the guidelines in IETF RFC 3171.
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