openflow

Figure 1 illustrates the concept of layered decoupling of SDN, including general basic hardware layer, hardware abstraction layer, network operating system, and upper-layer applications. The basic hardware and Hardware Abstraction constitute a physical network device, that is, the data forwarding layer in the SDN architecture. The network operating system and upper-layer applications constitute a control layer. The data forwarding and control layers are decoupled using a standardized interactio

", "node": [{"Node-id": "Host:c2 : E3:9e:9d:ba:d1 "," Termination-point ": [{" Tp-id ":" Host:c2:e3:9e:9d:ba:d1 "}]," Host-tracker-service: Attachment-points ": [{" Tp-id ":" Openflow:1:1 "," CORRESPONDING-TP ":" Host:c2:e3:9e:9d:ba:d1 "," Active ": true}]," Host-tracker-service:id ":" C2:e3:9e:9d:ba:d1 "," host-tracker-service:addresses ": [{" id ": 6," Mac ":" C2:e3:9e:9d:ba: D1 "," First-seen ": 1494558215486," Last-seen ": 1494558215486," IP ":" 1

Not long ago a PhD student and blogger who studied Sdn complained: "Now the Open Source SDN controller performance is poor Ah, 2K a new stream per second will prompt packet-in too much, stop working." The blogger asked how he defined a stream, which he said with TCP 5 tuple. The blogger asked him how he produced such dense packet-in, he said, using a server to send packet-in directly to the SDN controller. Bloggers then asked about the configuration of the server and the SDN controller, saying t

This article is included in my blog: http://www.sskywatcher.com/blog/archives/129 In an SDN environment, there are a number of flow table entries in each of the datapath instances of the Openvswitch, whether using the grep means of various keywords or other methods to confirm that the expected correct flow table entries are issued by the controller. It's very tedious and frustrating to see the matching and final action of a particular packet. With the Ovs-appctl tool combined with the Linux tcpd

In the SDN standard system developed by ONF, in addition to OpenFlow switch specification pairs, there is also a Protocol named OpenFlow Configuration and Management Protocol (OF-CONFIG) also needs to be concerned. As mentioned above, OpenFlow defines a kind of southbound interface in SDN network architecture, and proposes a method for the Controller to send a fl

, which are difficult to control. Some organizations also encounter complicated topology and difficult maintenance issues when setting up their own scalable and large-scale network environments. It is assumed that the physical topology of the network can be separated, network resources can be virtualized, the complexity of the physical structure can be hidden, and the management and control of the logical layer can be unified to meet the changing network needs. SDN and

In the previous two articles: Network virtualization flowvisor: Network virtual layer (top) and network virtualization Flowvisor: The network virtual layer (middle) respectively introduced the characteristics and implementation of Flowvisor, three series of the last chapter introduces the virtual network isolation mechanism.An important element of virtualization is the isolation between slices, because the isolation mechanisms for different resources are not the same, and are described separatel

OpenFlow controller was in use and then it can override this behavior through the flow table.) If OVS is used as a intermediate switch, rather than an edge switch, this ensures then the RSPAN traffic is distributed t Hrough the network.Mirroring to a VLANs can disrupt a network that contains unmanaged switches. See Ovs-vswitchd.conf.db (5) for details. Mirroring to a GRE tunnel have fewer caveats than mirroring to a VLAN and should generally be prefe

Http://www.sdnap.com/wp-content/uploads/2014/04/Opendaylight Learning and Development Beginner's tutorial Bupt-Tian Yi. pdf http://blog.csdn.net/charshaw/article/details/23205611 Opendaylight Environment Construction (recommended) A brief description of how to build a openflow environment without openflow hardware devices. Controller using Opendaylight (hereinafter abbreviated as ODL), is now the m

analyzer connected to the monitoring port, such as Cisco IDs or a PC with sniffer tools. The controlled ports and monitoring ports can be on the same switch or on different switches (remote span). Quality of Service (QoS): QoS (Quality of services, quality of service) refers to a network that can utilize a variety of basic technologies to provide better service capabilities for specified network traffic and is a security mechanism for the network. is a technique used to solve problems such as

the fault is highly recoverable; 4. There may be difficulties in convergence; 5. You need to configure and manage N instances; 6. It is difficult to scale out. New devices need to be added for scale-out. In SDN, how should we determine the position of the control plane? Ken Gray proposed a very interesting concept: revolution, evolution, and tradition ). So what is the revolutionary method? The revolutionary method proposed a new solution that completely adopted the centralized control plane of

Open VSwitch with SSL and mininetBy default, Mininet uses the unencrypted port in Open vSwitch for OpenFlow. This makes total sense since the purpose of Mininet is a a-tool, so encryption isn ' t usually needed and using Unenc Rypted control traffic allows for the use of tools like Wireshark to see the OpenFlow packets. But there is times when you might want-to-try and use

Open VSwitch with SSL and mininetBy default, Mininet uses the unencrypted port in Open vSwitch for OpenFlow. This makes total sense since the purpose of Mininet is a a-tool, so encryption isn ' t usually needed and using Unenc Rypted control traffic allows for the use of tools like Wireshark to see the OpenFlow packets. But there is times when you might want-to-try and use

Nick McKeown, a professor of engineering at Stanford University, expects a new network processor to replace the ASIC currently used in routers and switches in the next decade; he said he has gone deep into the future of the Communication Processor: "and if you try to look at it with your eyes, it's like a network-based RISC processor." McKeown assists in promoting a software-defined network based on OpenFlow communication protocols. Its goal is to gen

I Article name: sdpa: Toward a stateful data plane inSoftware-defined networking Posting time: 2017 Journal Source: IEEE, sigcomm Solution: I. openflow only provides a single "Action matching" paradigm for the SDN data plane. It lacks the stateful forwarding feature, which limits the ability to support advanced network applications. Over-reliance on SDN controllers to maintain the status leads to scalability and performance problems between

Openvswitch uses a lot of object-oriented ideas in implementation, such as classes. One of the most typical implementations is ofproto_class in the ofproto structure, which contains function pointers for processing functions of all major openflow objects. This struct is declared in the ofproto-provider.h and defined in the ofproto-dpif.c (in fact dpif_class is also closely related to it ). We pass through its declaration part (too long) and look at th

/src #. /nox_core-I ptcp: 6633 NOX 0.9.2 ~ Core ~ Beta (nox_core), compiled Sep 16 2013 15:42:31 00001 | connection_manager | WARN: connected: 172.16.4.10: 6633 172.16.4.4: 33632 00063 | openflow-datapath | DBG: recv 8 00064 | openflow-datapath | DBG: received ofp_hello 00065 | openflow-datapath | WARN: Negotiated OpenFlow