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Entries for 'sdn'

articlecloudsdnsdas April 21, 2014 by Lori MacVittie
#SDN #SDAS #cloud Things you need to know before diving into SDN... We've talked before about the bifurcation of the network, which is driven as much by the evolution of network services from "nice to have" to "critical" as it is by emerging architectures. The demarcation line in the network stack has traditionally been - and remains - between layers 3 and 4 in the OSI model. The reason for this is that there is a transition as you move from layer 3 to layer 4 from sta...
#SDAS #SDN #Virtualization Like moving to IPv6, simply picking up your existing network architecture and moving it to a completely new one is not going to happen overnight. There will undoubtedly still be "traditional" networks hanging around even when SDN adoption is considered mainstream and fully mature. That's the nature of evolution; it doesn't happen in the blink of eye, it takes time. Right now organizations are faced with a variety of options in networking. From VXLAN to NVGRE, from tr...
#devops #SDN The importance of APIs and programmable data paths to the future of networking.   OpenStack. OpenDaylight. SDN. Cloud. It's all about abstraction, about APIs and "software-defined" (which really means software-controlled, but this is neither the time or place to get into that debate). It's about jailbreaking the network. Enabling access to features and functionality in a way that results in new services, increased responsiveness and overall, the operationalization of the net...
#SDN #Devops #Cloud You gots to have some management .... Nick Lippis, who writes the eponymously named Lippis Report, had a fascinating report on the differences between enterprise and service provider environments with respect to network <something> virtualization. He observes, through a survey of the ONUG (Open Networking User Group) membership, that what the enterprise needs is Network Service Virtualization (NSV), which he and ONUG define as the virtualization of "enterpris...
SDN, like every new technology, has begun maturing from its singular focus on standardizing networks to embrace a broader vision focused on addressing real challenges in modern data centers. SDN today aims to provide an automated, policy-driven data center capable of adapting to the rapid shifts in technology driven by cloud, mobility and massive growth in applications. Customers require a comprehensive approach to deploying applications that includes automating and orchestrating both network an...
#SDN #NFV #devops #interop Service chaining allows the network to grow up and really participate in business processes The term "service chaining" hasn't quite yet made it into the mainstream IT vernacular.  It's current viewed as a technical mechanism for directing packets ,flows or messages (depending on where you sit in the network stack) around the network. Service chaining is the answer to "how do orchestrate the flow of data across the great divide that exis...
#sdas #webperf Sometimes it's not whether or not you use hardware, but the hardware you choose to use Everybody talks a good game with respect to changing the economy of scale, but very few explain how that's going to actually happen. The reality in most enterprise data centers today is that services are expensive. Traditional architectures prescribe a redundant set of network devices be deployed in order to preserve operational reliability (performance and availability). But given the hundred...
As we heard at last week’s Open Networking Summit 2014, managing change and complexity in data centers is becoming increasingly difficult as IT and operations are constantly being pressured to deliver more features, more services, and more applications at ever increasing rates. The solution is to design the network for rapid evolution in a controlled and repeatable manner similar to how modern web applications are deployed. This is happening because it is no longer sufficient for busine...
#SDN #cloud #devops Scalability's dirty little secret: if your architecture is designed to support elasticity, you must have idle resources Proponents of pure software infrastructures often point to rapid provisioning (like right now, push a button and blam! Instant scale) as one of the reasons to "go software." Superficially this is true. If your infrastructure is all software (or virtual, if you prefer) then when you need more X you can simply grab some available resources and provision more ...
#infosec #DDoS #webperf NTP is rarely mentioned as a protocol of importance, but without it, high availability would be nigh unto impossible and performance enhancing services would be crippled Krebs (on Security) writes about the recent NTP-based DDoS attacks in "The New Normal: 200-400 Gbps DDoS Attacks" and as is the case with most coverage of the attack, describes NTP as basically the Internet's time keeper. Which it is. While generally described to broader audiences as "that server that ...
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