HP t505 Administrator Guide 9 - Page 23

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) Congestion Avoidance Bandwidth Control • 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. • 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. • 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. 0.04% Enabled Default Live Q - Protection Filters 1 to 65535 1 to 65535 19