NetworkingNexus.net

29 – Interconnecting dual-Fabric: Full-Mesh or Partial-Mesh

This post discusses about design considerations when interconnecting two tightly coupled fabrics using dark fibers or DWDM, but not limited to Metro distances. If we think very long distances, the point-to-point links can be also established using a virtual overlay such as EoMPLS port x-connect; nonetheless the debate will be the same.

Notice that this discussion is not limited to one type of network fabric transport, but any solutions that use multi-pathing is concerned, such as FabricPath, VxLAN or ACI.

Assuming the distance between DC-1 and DC-2 is about 100 km; if the following two design options sound quite simple to guess which one might be the most efficient, actually it’s not as obvious as we could think of, and a bad choice may have a huge impact for some applications. I met several networkers discussing about the best choice between full-mesh and partial-mesh for interconnecting 2 fabrics. Some folks think that full-mesh is the best solution. Actually, albeit it depends on the distances between network fabrics, this is certainly not the most efficient design option for interconnecting them together.

Partial-Mesh with transit leafs design (left) Continue reading

NAPALM: Integrating Ansible with Network Devices on Software Gone Wild

What happens when network engineers with strong programming background and focus on open source tools have to implement network automation in a multi-vendor network? Instead of complaining or ranting about the stupidities of traditional networking vendors and CLI they write an abstraction layer that allows them to treat all their devices in the same way and immediately open-source it.

Apple and IPv6

It’s Apple’s Developers Conference time again, and in amongst the various announcements was week, in the “Platforms Status of the Union” presentation, was the mention of some recent IPv6 developments by Apple. As far as supporting IPv6 is concerned Apple still appear to get it. But do they really get all of it?

Musing: Does Oracle Prove that OpEx Beats CapEx in the Enterprise ?

Oracle has a tough quarter with its top line business shrinking quickly as developers choose open source databases instead. – Source: Bloomberg At a business level, there is definitely a trend by corporates to “avoid” Oracle as licensing fees have increased dramatically to reach a pain threshold that CIOs cannot ignore. While the choice for […]

The post Musing: Does Oracle Prove that OpEx Beats CapEx in the Enterprise ? appeared first on EtherealMind.

Baidu fires researcher involved in AI contest flap

Chinese search giant Baidu has fired one of its researchers, after the company found he had deliberately broken the rules of an artificial intelligence contest.The company was among the participants in a computing competition called the ImageNet Large Scale Visual Recognition Challenge. However, last month the contest organizers found that Baidu had essentially cheated to improve its results.Baidu was notified, and the company launched an investigation. On Thursday, it finally spoke publicly on the matter in a blog post, and said the team leader involved had been terminated from his position.To read this article in full or to leave a comment, please click here

Robots compete in NASA challenge

Video

OpenSSL releases several patches but none for serious issues

The OpenSSL project has released several patches for moderate flaws, including an additional defense against the Logjam vulnerability revealed last month.OpenSSL is widely used open-source software that encrypts communications using the SSL/TLS (Secure Sockets Layer/Transport Layer Security) protocol. SSL/TLS prevents clear-text data from being transmitted across the Web, avoiding high security risks.The patches include three for moderate flaws. Two of these fix flaws that could be used for denial of service attacks, according to an advisory. The third patch fixes a moderate flaw that affects OpenSSL versions prior to a June 2014 release. A fourth patch is for a low severity race condition flaw.To read this article in full or to leave a comment, please click here

Four challenges for Twitter’s next CEO

Dick Costolo has stepped down as CEO of Twitter after five years on the job, relinquishing his post amid longstanding problems including sluggish growth and frequent abusive comments posted to the social network. Twitter cofounder Jack Dorsey, who is also CEO of Square, will be interim CEO when Costolo steps down on July 1.When Twitter finds a permanent replacement, he or she will face several big challenges. Here are four of them:1. Defining what Twitter isPerhaps the biggest problem Twitter has is that many people who aren’t tech enthusiasts still don’t understand what it’s for or why they should use it. For every occasion Twitter is referred to as a social network, it’s also identified as a news source, a publishing system, a feed of real-time events and a micro blog. Perhaps it’s all those things, but that doesn’t help sell it to people who aren’t yet on the service. If it’s a social network, why use it when Facebook’s around? If it’s a micro blog, why not use a proper blog like Tumblr instead?To read this article in full or to leave a comment, please click here

Hacked data on millions of US gov’t workers was unencrypted, union says

A union representing U.S. government workers says it believes detailed personal information on millions of current and former federal employees that was stolen by hackers was not encrypted.The American Federation of Government Employees (AFGE) said the attack on the Office of Personnel Management (OPM) resulted in the theft of all personnel data for every federal employee.In a letter sent Thursday to Katherine Archuleta, director of the OPM, from David Cox, president of the AFGE, the union says it believes hackers targeted the government’s Central Personnel Data File, an expansive database with information on government workers except those in the military or intelligence fields.To read this article in full or to leave a comment, please click here

No GA yet for Cisco’s enterprise SDN

Cisco’s enterprise SDN controller is still in controlled release a year after it was first supposed to be generally available and months after an updated GA date. The APIC Enterprise Module shipped in February in controlled release to “multiple” customers who are using it in production, Cisco says, including IBM, which is using it on behalf of German airliner Lufthansa.To read this article in full or to leave a comment, please click here

Two years on, Google’s Project Loon drifts into focus

It’s been two years since Google first disclosed Project Loon, and while the company continues to keep most details of the project secret, the technology and challenges behind it are slowly coming into focus.Loon is an ambitious attempt to bring the Internet to the roughly 5 billion people on the planet who are out of range of existing networks. The project involves suspending cellular access points under high-altitude balloons to provide Internet access to those on the ground, an idea that sounds elegantly simple but was anything but.A series of recent presentations and talks by Google X employees have revealed some of the technical and commercial challenges the company faced in realizing Loon, and in nearing its target cost of $10,000 per balloon.To read this article in full or to leave a comment, please click here

Two years on, Google’s Project Loon drifts into focus

Intel has 4 processor lines

Just a quick note: Intel has four different processor lines -- or four different "microarchitectures". All Intel processors support the x86 instruction set externally, but have very different microarchitectures internally.

To start with is their mainstream processor in desktops, notebooks, servers, and supercomputers. This accounts for the bulk of their business, and what we think of as an "Intel processor". The latest version of this microarchitecture is "Broadwell". Previous versions have been Haswell, Ivy Bridge, Sandy Bridge. It's sold as the Xeon, Core i7/i5/i3, Pentium, Celeron, etc.

Then there is the low power processor to compete against ARM in cellphone devices known as the "Atom". There are have been two radically different versions of this processor. The older version of the microarchitecture from 2008 was known as "Bonnel", and it kinda sucked (dual-issue, but in-order). The newer version of the microarchitecture, "Silvermont", is out-of-order, and is much better. Atom processors are just as power efficient as ARM processors. Indeed, many phones use them without people really being aware of the difference. I point this out because there is a widespread misconception that ARM processors are more power efficient than Intel processors. Note that all these processors are 64-bit internally, though Continue reading

Pluribus Networks Lets Go of Hardware, Plugs Into Dell

A strategy overhaul turns Pluribus into an all-software startup.

Appeals court denies requests to delay net neutrality rules

A U.S. appeals court has denied requests by several broadband providers and trade groups to delay the Federal Communications Commission’s net neutrality rules while they challenge the regulations.The Court of Appeals for the District of Columbia Circuit on Thursday denied 10 requests to delay the implementation of the rules. The court’s denial of the stay requests means the new net neutrality rules will go into effect as scheduled Friday, even as 10 lawsuits against the rules go forward at the appeals court.The groups requesting a stay of the rules “have not satisfied the stringent requirements for a stay pending court review,” a panel of three judges wrote Thursday.To read this article in full or to leave a comment, please click here

FTC charges game developer with misusing money raised on Kickstarter

A project developer who raised more than US$122,800 on Kickstarter to create a new board game has been charged by the U.S. Federal Trade Commission with using the money for personal equipment, moving expenses, rent and licenses for a separate project.Erik Chevalier, doing business as The Forking Path, asked for money from individuals to produce a board game called The Doom That Came to Atlantic City, but cancelled the project more than a year after the May 2012 funding campaign, the FTC said in its first consumer-protection complaint involving crowdfunding.To read this article in full or to leave a comment, please click here

Uber launches iPhone game to attract new drivers

Uber launched a new game for iPhone users today aimed at teaching people what it’s like to work as a driver for the tech-driven transportation company.UberDrive is equal parts teaching tool and recruitment mechanism: players are taught to find the most efficient route around a map of San Francisco for the digital passengers they “pick up” in the game. Players are taught to go and grab riders from areas where surge pricing is in effect, and get rewarded for taking efficient routes to their destination. Surge pricing is Uber’s practice of charging multiple times its base fare in areas seeing heavy demand.To read this article in full or to leave a comment, please click here

BRKDCT-2333 – Data Center Network Failure Detection

Presenter: Arkadiy Shapiro, Manager Technical Marketing (Nexus 2000 – 7000) @ArkadiyShapiro

You could say I’m obsessed with BFD –Arkadiy

The focus on this session is around failure detection (not reconergence, protocol tuning, etc). This session will not go over user-driven failure detection methods (ping, traceroutes, etc).

Fast failure detection is the key to fast convergence.

Routing convergence steps:

Detect
Propagate (tell my neighbors)
Process (routing recalc, SPF, DUAL, etc)
Update (update RIB/FIB, program hardware tables)

Failure detection tools: a layered approach: Layer 1, 2, MPLS, 3, application.

Interconnect options:

Point to point – failure detection is really easy here; event driven; fast
Layer 3 with Layer 1 (DWDM) bump in the wire
Layer 3 with Layer 2 (ethernet) bump in the wire
Layer 3 with Layer 3 (firewall/router) bump in the wire

Think about this: moving to higher speeds (1G -> 10G -> 40G -> beyond) means that more data is lost as you move to higher speeds without changing the failure detection/reconvergence characteristics of the network. 1 second reconvergence time at 1G is way different than 1 second at 40G.

Be aware: ISSU may not support aggressive timers on various protocols. Another reason to be wary of timer cranking.

Cisco Won’t Blacklist White Box Switches

A Cisco white box is a possibility, John Chambers says.

Is IoT a Threat or an Opportunity for Service Providers?

Implications of IoT for service providers.

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