HP Velocity - Administrator Guide

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Administrator Guide for Thin Clients | HP Velocity
LiveQ - Packet Loss Protection settings
LiveQ outputs the original number of input packets as well as extra packets containing redundancy information. The
number of packets that are used to encode the redundant packets and the number of redundant packets generated
varies based on current network-loss conditions and the configured Target Loss Rate. LiveQ - Packet Loss Protection is
available for the UDP flows.
Target Loss Rate policy filters can be used to specify the IP addresses and ports of application flows to which a specific
level of packet loss protection is applied.
LiveQ configuration settings (Table 8 on page 19
and Table 17 on page 20) specify the following parameters:
• Target Loss Rate—The Target Loss Rate (TLR) that HP Velocity will attempt to achieve for HP Velocity-protected
flows.
Note: TLR refers to the amount of packet loss that a thin-client application can tolerate while still delivering an
acceptable QoE. The recommended TLR for thin-client applications is 0.04%.
• Congestion Avoidance—Analyze network links to identify those with bandwidth constraints, and then automatically
adjust packet-loss protection to accommodate the constraints.
• Bandwidth Control—The encoding level applied to HP Velocity-protected flows. HP Velocity constantly monitors
network loss and automatically applies the protection mode required to reduce network loss to the default TLR. The
protection mode used at any given time depends on the real-time loss measured in the network.
• LiveQ - Protection Filters—The UDP ports to which LiveQ - Packet Loss Protection is applied. Use a space-separated
list of ports or ranges; for example, 80 1750 1751 2003-2050.
Table 8: LiveQ - Packet Loss Protection settings
Parameter Options Default
Target Loss Rate (TLR)
•0.04%
•0.1%
•0.2%
•0.4%
Note: An aggressive TLR might not be achievable in high-loss
networks. After modifying the TLR, refer to the Network Monitor graph
(see Flow information
on page 26) to verify whether the rate specified
is being achieved.
0.04%
Congestion Avoidance
•Disabled
•Enabled
Note: When Congestion Avoidance is enabled and bandwidth
constraints are detected, the Bandwidth Control and TLR settings are
overridden to ensure the best network performance possible.
Enabled
Bandwidth Control
• Low: Cap the estimated HP Velocity protection overhead at or below
27%. (Recommended for environments where bandwidth is very
constrained.)
• Medium: Cap the estimated HP Velocity protection overhead at or
below 40%. (Recommended for environments where bandwidth is
moderately constrained.)
• Default: Maximize performance while minimizing the required
bandwidth. (Recommended for environments where bandwidth is
not constrained.)
Note: Higher encoding levels protect against greater network loss, but
require more bandwidth.
Default
Live Q - Protection Filters 1 to 65535 1 to 65535