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Quality of ServiceSilver Peak provides a variety of Quality of Service (QoS) options to enterprises. In addition to honoring existing QoS markings, the Silver Peak solution provides native support for advanced QoS, including sophisticated classification logic, a variety of packet marking techniques, queuing, and traffic shaping.
Packet Marking
Packet marking provides a way for network elements to provide different levels of service to different packets, based on markings in the IP header. Using packet marking avoids the need to reclassify packets by deep inspection at each hop, and avoids the need to maintain per hop state within the network. By marking tunnel packets, Silver Peak NX Series appliances can provide hints that enable downstream devices, such as WAN routers, to treat each packet appropriately. Silver Peak’s packet marking functionality can be used even when other QoS features, such as shaping, are disabled.
Silver Peak provides the following packet marking functions for maximum flexibility, particularly when enterprises are delivering applications over service provider networks:
- Mark outer (tunnel) packets based on its own specified criteria
- Mark outer (tunnel) packets based on the inner packet marking
- Mark inner packets based on its own criteria
- Leave inner packet markings alone
Application Classification
Application acceleration solutions require robust application classification capabilities to enable different priorities and handling instructions to be applied to individual types of traffic. Silver Peak employs a variety of techniques to achieve this, which include:
- Five-tuple Filters. Applications can be classified using the five basic elements of a flow: source IP, destination IP, source port, destination port, and protocol.
- Connection Tracking. Some applications, like FTP and VoIP, initiate connections that do not use well known ports for data transfer. Stateful classification and proxy functionality may be required in order to track these more complex applications.
Queuing and Shaping
The most likely congestion points in a typical enterprise are on the near and far sides of the WAN. Silver Peak employs various QoS mechanisms to improve traffic delivery through these congestion points, including Queuing policies, dropping disciplines, and service disciplines.
The NX Series appliances are also equipped with a variety of tools to shape traffic across an enterprise network. These include interface Traffic Shaping, tunnel traffic shaping, and classes of service algorithms.
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