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A data monitoring switch is a networking hardware appliance that provides a pool of monitoring tools with access to traffic from a large number of network links. It provides a combination of functionality that may include aggregating monitoring traffic from multiple links, regenerating traffic to multiple tools, pre-filtering traffic to offload tools, and directing traffic according to one-to-one and many-to-many port mappings. Data monitoring switches enable organizations to use their monitoring tools more efficiently, to centralize traffic monitoring functions, and to share tools and traffic access between groups. Some of these devices also provide functionality that helps justify tool purchases and simplify deployment and management of the device itself. Several other terms have been used to describe this class of device, including data access switch, tool aggregator, net tool optimizer, and distributed filter tap. == Function == A data monitoring switch typically provides 24 to 38 ports in a 1U 19-inch chassis, with higher port density devices expected in the future (ask about dimensions from the vendor - devices with higher port density or many card slots may be 2U or larger). Ports may be dedicated as network inputs or tool outputs, or may be configurable as either, with most product trending toward the latter. Network input ports may be paired to provide in-line connectivity (integrated Tap function), or out of band (mirrored) to take input from external network Taps or network switch SPAN ports. Some devices have the ability to interconnect chassis to configure logical systems with hundreds of ports, although user interface complexity can serve as a limiting factor in many products. When a number of monitoring tools are connected to the data monitoring switch’s tool ports, copies of traffic from any of the network ports can be switched to any of the tools using the data monitoring switch’s management interface. A unique characteristic of the data monitoring switch, as opposed to matrix switches and aggregating Taps, is that it can support a flexible set of port mappings including: *One network link to one monitoring tool *One network link to many monitoring tools (regeneration) *Many network links to one monitoring tool (aggregation) *Many network links to many monitoring tools (dynamic many-to-many connectivity) In addition to directing monitoring traffic, data monitoring switches are capable of filtering traffic by Layer 2 to Layer 4 protocol criteria such as VLAN or IP address, enabling only traffic of interest to be sent to specific tools. This capability can prevent tool oversubscription and facilitate drilling down on issues. As this is still a relatively new set of technologies, there are several different approaches to the hardware and software configurations. As such, each product sports benefits that none of the competitors includes. Some data monitoring switches offer different management interfaces (fully integrated GUI, automation, etc.), load balancing across multiple tool ports, filtering on patterns in packet payloads, and converting media and data rates so tools can be used to monitor traffic from dissimilar links. The more advanced products offer enhanced security (access control, port permissions, etc.) either on the individual level or by using groups, filter library / archiving, and the ability to manage multiple devices simultaneously from a single interface. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Data monitoring switch」の詳細全文を読む スポンサード リンク
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