#osn 2500

[demoploo]

Load balancing classification of router

Data flow service is what we OSN 1500B often say that the NetFlow, it is a network protocol, it collects IP traffic information as the recording, and then send them to a collector for traffic analysis, is a kind of new technology is gradually perfect.

The main function of NetFlow is that it can provide analysis and capacity planning, trends anddata priority information network for service providers and enterprises. This technique can also be used for IP billing application and service level guarantee based on (SLA) calibration service.

The working principle, NetFlow is: NetFlow recorded first initialized data of IP packets, such as IP protocol type, type of service (ToS), interface identifier, and then, in order to more effective for data matching and counting, NetFlow let the subsequent data transmission, in the same data stream at the same time, the they use their respective services, such as security filtering, QoS strategy, traffic planning. Real time data is stored in the NetFlowcache, by reading the instructions can regain.

Two, on the basis of NetFlow, Cisco, and the NetFlow policy routing (NPR) technology. TheCisco IOS service based technology, offers traffic planning, IP pre classification function,NetFlow provides a mechanism for efficient, high performance for policy routing.

The NPR also supports the CEF system structure, so it can be used in distributed platform.

Three, distributed switch of NetFlow function and NetFlow collector tool can monitor application flow, flow measurement performance with the change of time, can also help to ensure that the capacity planning, according to different application requirements and reasonable allocation of I/O resources to the application, if the performance of the ITadministrator to monitor in the application of flow virtual environment for running, can enabledistributed flow monitoring in the switch.

Four, distributed switch NetFlow on port group layer, single layer or layer enabled uplink port.When in port layer configuration NetFlow, administrators should choose NetFlow covering the label, this will ensure that the port group layer NetFlow is disabled, but also can monitor the flow.

Five, in the process, different parameter control, should according to the relevant informationto install your environment in the collector tool, to configure the collector is arranged in the IPaddress and port, the advanced settings parameters allows you to timeout and sampling rateflow control. In order to change the number of information collection for a flow, you can change the sampling rate.

Six, when you want to see the collector tool, the collector tool is part of a VDS IP address,rather than as individual hosts all traffic information management network IP address, VDSaddress configuration of IP is very useful. Due to the lack of VDS IP address input, the collector tool will provide flow detailed information on each host management network IP address.

Effects of seven, NetFlow function of CPU depends on the number of flows in your environment and flow operation flow rate. If you think that your environment has a lot of traffic,and that CPU resources, you can use the control to provide the NetFlow settings to choose to monitor flow. You can change the sampling rate or choose to monitor internal flow.

In addition, you can selectively enable or disable the port or port NetFlow, as customersstarted virtualization layer application, they will need the right tools to manage theseapplication SLA requirements. VSphere 5 platform NetFlow function can monitor these onelayer application flow, but also for cyber source capacity planning.

Data flow service is what we often say that the NetFlow, it is a network protocol, it collects IP traffic information as the recording, and then send them to a collector OSN 2500 for traffic analysis, is a kind of new technology is gradually perfect.

More information, please view: http://www.huanetwork.com

[demoploo]

What are the modules of the core of huawei SDN? (1)

In order to understand the OSN 2500 price software defined network (SDN), you mayencounter a lot of related to the technical terms. Some of these terms areunique to SDN, and some other terms is not exclusive to SDN, but is oftenused to describe the SDN design.

The controller

A key concept of the SDN is known as the controller of the equipment, theequipment and network equipment session all within a certain domain, was informed that the network topology, and know everything from a center pointof network programming. Can say, the SDN controller is the network programming model from the distribution pattern (mutual communicationnetwork device determines the forwarding path) into a centralized model.

Programming on the network using a SDN controller, network operatorsneed not use the traditional methods (such as the command line interface)to the network equipment of individual programming. In addition, can also according to the cost or security policy requirements to create proprietarynetwork forwarding paradigm.

The SDN controller as a middleware, which means its communication with the two direction. Most of the discussion so far are around Southcommunication. That is to say, the controller program of network equipment, and receive data from the device, which is south of communication. An example is the South communication controller based on OpenFlow network switch's forwarding table program. Another direction is to the north of communication. Hope that communication between thevarious applications and programming on the network controller are calledthe North to. The controller sends a network configuration service requestapplication north to an example communication is similar to the VMwarevCloud Director.

The switch

Speaking of SDN, many people may talk about equipment is the switch,particularly Ethernet switch. The speed and density of the Ethernet switchhas been increasing, for the data center hosts, blade center and Ethernet storage provide uplink. Server virtualization is coming, hypervisor is becoming more and more important in software switch, it can detect thevirtual server and virtual network card, and can access hypervisor flowtogether, sent to the physical network.

Both hardware and software switch plays an important role in SDN, first is the switch's forwarding table can be programmed controlled by controller.Taking into account the soft switch generally resides at the edge of the network, so the soft edge "intelligent" concept has emerged.

To support intelligent soft edge network designers feel, software switch to run on the hypervisor was ideal, because it can install abundant networkfunction, which make the physical hardware switches operate at a relatively simple configuration environment. In the design of SDN intelligent soft edge,the controller can be forwarded, QoS and security strategy through the softswitch.

For example, soft switch can have the access list, the rate limiting QoS parameters and traffic priority, and intelligence is applied in virtual portforwarding. When the network data from the hypervisor, has passed thesafety compliance testing, rate shaping and packaging. All these functionsare placed at the edge of the network, can let the core hardware switches only to make flow transmission fast.

Soft edge design not all networks allow intelligence, not all feasible SDNcases with soft switch. For SDN, a hardware switch will still be some such as end-to-end business strategy deployment, flow control and securityenforcement task role. In addition, the basic configuration still have a certain amount of will complete in a hardware switch, no matter how smart edgenetwork.

ONF is a major by network vendors and service providers membership organization, shutting the door operation. The OpenFlow specification of the foundation has released PF 1, in a production environment often see; the next step to the release of OF 1.3, will be the main switch for mostmanufacturers. OF 1.4 is currently being developed.

Remember, while OpenFlow can be like the Open vSwitch that completelyin software switch on the implementation, but be translated into network on chip hardware switch (ASIC) can execute code, OF has been proved toface the challenges of the. Although there are reports that can be better,with OF's new chip will come out soon, but the usefulness of the users in the evaluation of OF, will be tested according to the existing network, in order to ensure that the required OF functions can be extended as far as possible, the application can support them.

Notable is, in addition to OF, some manufacturers have some specialsouthward API launch. This is partly because the OF instruction set Co.,sometimes it is difficult to achieve in the traditional chip. For example,Cisco, although support for OpenFlow, but the API to use the ONE architecture to realize, Cisco's claim is that it allows the network, APIprogrammers can give OSN 6800 price full play to the Cisco hardware.