Comtech EF Data Vipersat CDM-570L, User Manual

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Chapter
3 -
Using the Command Line Interface (CLI)
3-27
Vipersat Configuration
classifier, which looks at traffic that is passed in both directions (Hub-to-
Remote and Remote-to-Hub). When an IP packet matches a defined QoS rule,
the Remote modem sends an ASR to the VMS that contains the destination
address of the detected packet, the defined bit rate, and the policy type. If avail-
able hardware and bandwidth exist, the VMS will establish the SCPC carrier
automatically.
Enable Quality of Service (QoS) Feature
The Remote must have the QoS FAST feature code, and the QoS feature must
be enabled in order for the QoS Switch Detection feature to function. The QoS
feature is Enabled/Disabled from the Feature Configuration screen (see
figure 2-3).
Configure QoS Rules
The Vipersat CDM-570/570L is capable of performing automatic switching
based on the QoS rules for a Remote modem. QoS rules can be assigned to
different flow types that are user-defined by any combination of traffic type
protocol (FTP, UDP, RTP, etc.), source/destination IP (specific or range), and/
or Layer 3 source/destination port.
The Vipersat QoS Switching feature is designed to manage single, specific
sessions or flow types, such as a UDP video stream targeted to a specific port.
When defining QoS rules for QoS based switching, it is best to make them as
specific as possible so as to avoid unintended or multiple sessions/flows being
generated with that rule. A QoS rule that creates multiple flows will result in
poor switching performance. With voice traffic, for example, prioritize by using
the VOCE protocol rather than prioritizing with RTP or UDP.
From the
Main Menu for the Remote modem, enter Q to access the QoS
Configuration screen, as shown in figure 3-35.