Is MLAG an Alternative to Stackable Switches?

Alex was trying to figure out how to use Catalyst 3850 switches and sent me this question:

Is MLAG an alternative to use rather than physically creating a switch stack?

Let’s start with some terminology.

Link Aggregation Group (LAG) is the ability to bond multiple Ethernet links into a single virtual link. LAG (as defined in 802.1ax standard) can be used between a pair of adjacent nodes. While that’s good enough if you need more bandwidth it doesn’t help if you want to increase redundancy of your solution by connecting your edge device to two switches while using all uplinks and avoiding the shortcomings of STP. Sounds a bit like trying to keep the cake while eating it.

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VSS Recovery mode

Dual-active Detection (DAD) is designed to prevent a split-brain scenario where both VSS supervisors become active in the event of a VSL link failure. It uses a separate (from the VSL link) secondary communication link to communicate the devices state.
When the VSL link fails the standby switch becomes active and the current active switch is informed of this over the DAD links and goes into recovery mode to stop a split-brain situation occurring.

Viptela Control Plane Setup

Viptela is an SDWAN platform now owned by Cisco. In this blog I will setup a Viptela control plane using self signed certificates for the purpose of testing in a lab environment. The recommended mode of operation for production deployments is using Symantec signed certificates that are...

BrandPost: The Cloud Payoff: Ensuring Hybrid Works for Your Enterprise

As more and more enterprises move to hybrid cloud, there are some interesting relationships among enterprises, Internet and cloud exchanges, and colocation providers to satisfy IT strategies through hybrid clouds.  In its Strategic Roadmap for Data Center Infrastructure, Gartner notes that “by 2019, 80% of enterprises will have an IT strategy that includes multiple Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) providers.” This is up from only 10% in 2015, while “by the end of 2018, 10% of enterprises will close their on-premises data centers entirely.”To read this article in full, please click here

Nominations Open! Jonathan B. Postel Service Award 2018

We are pleased to announce that nominations for the 2018 Jonathan B. Postel Service Award are now open. Do you know someone who should be a recipient?

This annual award is presented to an individual or organization that has made outstanding contributions in service to the data communications community and places particular emphasis on those who have supported and enabled others.

Nominations are encouraged for individuals or teams of individuals from across the data communications industry around the world who are dedicated to the efforts of advancing the Internet for the benefit of everybody.

Past Postel award winners include kc claffy for her pioneering work on Internet measurement, Mahabir Pun for his key role in bringing the Internet to rural Nepal with the founding of the Nepal Wireless Networking Project, and Bob Braden and Joyce K. Reynolds for their stewardship of the RFC (Request for Comments) series.

The signature crystal globe and a USD 20,000 prize will be presented at the IETF 102 in Montreal, Canada (14 -20 July 2018) to the chosen candidate.

Nominations can be made either by self nomination or by third party: https://apps.internetsociety.org/form/postel-nominations

Please share this information with your networks. The deadline for nominations Continue reading

Li-Fi gets office-install at Philips lighting

Broadband data-over-light, sent through lighting fixtures commonly seen in commercial buildings, moves a step closer to possible mass adoption through an apparently functioning smart-office installation in Paris.Li-Fi uses light waves for data communications, as opposed to Wi-Fi, which uses microwave radio. Li-Fi has 10,000 times Wi-Fi radio’s RF spectrum, experts say. The pilot installation by Philips is at a French real-estate company’s office.Philips Lighting, the giant lighting-system maker, says it is now offering Li-Fi modems installed within its existing LED luminaires, such as its downlighters. A luminaire is the building-industry term for a complete lighting fixture.To read this article in full, please click here

Li-Fi gets office-install at Philips lighting

Broadband data-over-light, sent through lighting fixtures commonly seen in commercial buildings, moves a step closer to possible mass adoption through an apparently functioning smart-office installation in Paris.Li-Fi uses light waves for data communications, as opposed to Wi-Fi, which uses microwave radio. Li-Fi has 10,000 times Wi-Fi radio’s RF spectrum, experts say. The pilot installation by Philips is at a French real-estate company’s office.Philips Lighting, the giant lighting-system maker, says it is now offering Li-Fi modems installed within its existing LED luminaires, such as its downlighters. A luminaire is the building-industry term for a complete lighting fixture.To read this article in full, please click here

Li-Fi gets office install in Philips lighting

Broadband data-over-light, sent through lighting fixtures commonly seen in commercial buildings, moves a step closer to possible mass adoption through an apparently functioning smart-office installation in Paris.Li-Fi uses light waves for data communications, as opposed to Wi-Fi, which uses microwave radio. Li-Fi has 10,000 times Wi-Fi radio’s RF spectrum, experts say. The pilot installation by Philips is at a French real-estate company’s office.Philips Lighting, the giant lighting-system maker, says it is now offering Li-Fi modems installed within its existing LED luminaires, such as its downlighters. A luminaire is the building-industry term for a complete lighting fixture.To read this article in full, please click here

Fake News Spreads Fast, but Don’t Blame the Bots

Fake news spreads much faster than real news, and real people – not bots – are to blame, according to a recent study.

Fake news – defined by the researchers as stories debunked by six major fact-checking services – can spread 10 times faster than legitimate news stories, according to the study by researchers at the Massachusetts Institute of Technology.

The researchers studied rumors spread on Twitter between the service’s launch in 2006 and 2017. While some U.S. lawmakers and other critics have blamed automated bots for the spread of fake news before the 2016 election, the MIT researchers filtered out tweets spread by bots for their study.

The researchers found that false news not only spread faster than true stories, but it also had a much wider reach, according to the study, published this month in Science. The top 1 percent of news “cascades” – the researchers’ word for widely spread tweets – reached between 1,000 and 100,000 people, while Continue reading

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