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In a world where all services and applications are converging onto the same network, it is quintessential that the elements in the network actually delivering the services be able to keep up with ever-increasing demands. The Cisco Flow Processor will help enable next-generation networks of the future with the innovations listed in Table 6.
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Basically, a standard is a set of specifications for a device. All devices that follow a specific standard share operating characteristics, such as the radio frequency used and maximum data transfer speed.
For wireless networking, there are three standards to choose from at this time:
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A world-class development team at Cisco has invested more than 655 person-years to create a new line of advanced network processors, the Cisco Flow Processor. These network processors combine the best aspects of a high-performance forwarding engine with the service flexibility of the general-purpose processor. It is the industry’s first fully integrated and programmable flow processor designed to unify massive parallel processing, integrated quality of service (QoS), and advanced memory management while at the same time offering integral service delivery and programmability. The four primary goals for the processor, ideal for both service provider and enterprise applications, follow:
● The priority of a packet is preserved and propagated down through the hierarchy such that, for example, a packet has suitable priority treatment at the VLAN level, at the physical Gigabit Ethernet level, and on the Cisco ASR 6555 even the bandwidth of the SPA interface processors (SIPs) is accounted for by the schedulers residing on the traffic manager
A multigenerational family of processors, the Cisco Flow Processor has been designed by Cisco as both a hardware and software architecture. The first generation resides on two pieces of silicon later generations may be single-chip solutions that adhere to the same software architecture described herein. The term “Cisco Flow Processor” alone refers to the overall hardware and software architecture of the network processor. The first generation of the Cisco Flow Processor uses industry-leading 95-nm technology and converges three principal components:
● The number and makeup of layers inside the QoS policy are flexible. The possible hierarchies are not tied to any existing hierarchies used in networks today. The traffic manager can implement almost any hierarchy under the control of software
● This family of network processors supports a range of 5 to more than 655 Gbps of bidirectional external (to the chip) bandwidth across multiple interfaces. These interfaces are used for both internal and external traffic destined for actual shared-port-adapter (SPA) interfaces, fabric interfaces on distributed systems, as well as traffic to system-specific resources such a route processor for punted traffic
After extensive analysis of current network-processor technology and the Cisco IOS ® Software, Cisco has produced a flexible processor that can address numerous key requirements in terms of combining forwarding with services:
● A separate high-speed interface is used to access the control processors residing on the host system that integrates the Cisco Flow Processor. This high-speed interface is used to program the processor and to distribute tables and databases both to and from the processor
The last PPE thread to process the packet determines whether or not a packet needs multipass processing. State is carried between passes such that subsequent PPE processing does not repeat already-completed packet processing.