Appendix B: Minimum Network Requirements
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N2312/N2322 User Manual
Appendix B: Minimum Network Requirements
The following list specifies the minimum network requirements that must be considered when deploying your N-Series equipment.
These requirements cover the necessary protocols and features needed to drive N-Series streams.
NOTE:
Specific configuration recommendations are based off of the Cisco Catalyst series, however this may vary.
1.
Managed Network Switch
2.
Gigabit Ethernet (N1000/2000 Based Systems)
3.
Internet Group Management Protocol (IGMP) Version 2
IGMP Snooping
IGMP Snooping Querying
Network must include at least one IGMP Querier to maintain stream connections. It is recommended to have all capable
switches with the querier enabled and allow IGMP auto-elect to determine the Designated Querier (DQ).
Query Interval – 30 seconds. This is the interval between sending IGMP general queries.
Query Response Interval – 10 seconds. This is the maximum time the system waits for a response to general queries.
Last Member Query Interval – 100 milliseconds. This is the interval to wait for a response to a group specific or group-
and-source-specific query message.
Immediate Leave (also known as Fast Leave, etc. depending on switch manufacturer).
- Immediate Leave breaks any daisy chaining of multiple units together with a single home run, therefore you will not be
able to have both Immediate Leave units and daisy chaining on the same VLAN.
NOTE:
If Immediate Leave is disabled, set IGMP Robustness to Default 2. Robustness can be adjusted generally from 2-10. The
higher the value, the more leave latency is added.
Warnings/Notices
There is a known behavior within IGMP that Encoder streams, whether requested across an uplink or not, will be
requested by the DQ and will be present on all uplinks between the stream source switch and the DQ.
- This means that even though you may not be routing a stream to another switch, the DQ’s request still puts the
stream on the uplink. Therefore, it is important to account for all streams forwarding to the DQ.
- The presence of a multicast router with PIM-Sparse configured to handle the multicast traffic may eliminate or limit
this behavior.
- N-Series Encoders also support separate VLAN tagging of audio and video streams to allow only certain audio and
video streams through an uplink in order to eliminate or limit this behavior.
4.
Jumbo Frames Enabled
The N2300 Series Encoders/Decoders produce a frame payload larger than 1500 bytes which requires the switch to have the
capacity of handling Jumbo Frames enabled.
5.
TCN Flood Off
TCN flood protocol will cause unnecessary backplane and bandwidth usage when adding or removing a device on the network.
This can cause stream interruptions as the flooding sweeps through the network.
Should you encounter any problems not covered by these guidelines, please contact technical support via email
(
) or call 256.461.7143 x9900.
