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NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion.
Class of service (COS or CoS) is a parameter used in data and voice protocols to differentiate the types of payloads contained in the packet being transmitted. The objective of such differentiation is generally associated with assigning priorities to the data payload or access levels to the telephone call.
The type of service (ToS) field is the second byte of the IPv4 header. It has had various purposes over the years, and has been defined in different ways by five RFCs. [1] Prior to the redefinition, the ToS field could specify a datagram's priority and request a route for low-latency, high-throughput, or highly-reliable service.
Different PHBs may be defined to offer, for example, low-loss or low-latency service. Rather than differentiating network traffic based on the requirements of an individual flow, DiffServ operates on the principle of traffic classification , placing each data packet into one of a limited number of traffic classes.
Ethernet flow control disturbs the Ethernet class of service (defined in IEEE 802.1p), as the data of all priorities are stopped to clear the existing buffers which might also consist of low-priority data. As a remedy to this problem, Cisco Systems defined their own priority flow control extension to the standard protocol. This mechanism uses ...
Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network, or a cloud computing service, particularly the performance seen by the users of the network.
[dump service req] Request for assistance with dump operation. [mem dump request] Request for next memory dump segment. [memory dump data] Contains memory dump data. [dump completed] Acknowledgment of dump completion. [volunteer assist] Offer of dump/load/loop assistance. [request program] Request for system or loader program. [rem boot request]
Network Based Application Recognition (NBAR) [1] is the mechanism used by some Cisco routers and switches to recognize a dataflow by inspecting some packets sent.. The networking equipment which uses NBAR does a deep packet inspection on some of the packets in a dataflow, to determine which traffic category the flow belongs to.