|By Marten Terpstra||
|August 7, 2014 06:00 AM EDT||
In Monday’s blog post, Derick explained the network engineering cycle, traversal in the referential space and the need to provide solutions that enable the network engineer to do his or her job better, more accurate, easier, simpler, more complete. We cannot automate or encapsulate a network engineer’s job and we should not try. We must however encapsulate and automate specific tasks and workflows.
Multichassis Link Aggregation (MLAG) is one of those features that should be so straightforward, but isn’t. MLAG allows a single device to be connected to 2 ethernet switches using a single Link Aggregation Group (LAG). The device is configured with a single LAG with ports that are connected to two switches, rather than a single switch. The two switches coordinate between each other and make it appear to the device as if they are single device.
This part is actually straightforward, it really comes down to using a single LACP system-id across both links from both switches. The end device is blind to the fact there are different switches at the end of each link.
MLAG is Complicated
The hardest part of MLAG is the packet forwarding coordination and behavior between the two switches. For instance, if the end device sends a broadcast packet onto one of the links of the LAG towards switch 1 of the MLAG, the solution must ensure that switch 2 does not send that same broadcast packet back to the end device. Because the two switches together create a LAG, the basic rule that a packet received on a LAG can never be send back out that same LAG must be observed. Sounds simple, but if that broadcast packet gets to switch 2, how does it know it came from the device at the other end of the LAG to begin with? Sounds trivial, just look at the source MAC address, but ethernet forwarding usually does not do anything with a source MAC address.
If a broadcast packet comes in the rest of the network and arrives at switch 1 and 2, who will forward this packet? Only one of them can, again to avoid duplication of packets. Similarly for multicast. In multicast rich environments, would you always pick the same switch to forward this onto the LAG, or would you share that responsibility. And if you share, how do you inform the rest of the network that it is this switch for this specific group that is responsible for distribution?
When one of then links in the LAG fails, what does that switch do with packets towards the end device? How does it get that packet to its MLAG peer so that it is delivered? If you have configured MLAG on any popular platform out there, you have now discovered the reason for the private interconnect between two MLAG peers.
They’re all the same, but different
Whether you call it MLAG, SMLT, VSS, vPC, vLAG or anything else, they all implement the same concept. And there is no question that MLAG is a rather complicated feature to implement and get all the data forwarding possibilities right. There are many failure scenarios to consider to ensure that traffic is not lost, looped, or duplicated.
There is however no reason to expose any of this complexity to you as the user. Why do I have to create a port group between two switches, then explain to each that they are MLAG peers on a special VLAN, then stick IP addresses on this VLAN, create an MLAG peering session, verify it is up and running, then create actual MLAG ports that are mapped to some unique identifier I need to track that needs to match up with the one used on the peer? I counted 24 individual configuration steps just to get the MLAG peering configured.
Why so Complicated?
This is a perfect example of exposing the gory details of the scaffolding required for something that as a user really should be as simple as “I want this port on this and that port on that switch to be part of the same LAG”. Because really that is what you want. Sure, for debugging purposes you may need to understand what is communicated between switches and who has taken responsibility for what, but why did you the user have to manually create all this plumbing between the two systems? That should be encapsulated by us, the vendor, so that you can focus on automating the actual provisioning of ports in an MLAG.
And I completely understand the implementation reasons for having 2 switches matched up to become MLAG peers and MLAGs can only exist between those two peers. But it’s one of those limitations imposed on you that should not be, there is absolutely no reason you could not have 3 MLAG peers. Or 4. Or any combination of 2 switches, different for each MLAG. For us there is no difference between a LAG and an MLAG. That is, there most certainly is a difference, but as far as provisioning one goes, they are identical. You simply configure a LAG. And you have a choice to add ports from other switches to that LAG. And that’s it. All that took was a desire to remove these constraints to make your job easier and more accurate.
Focusing on the user experience of the network takes time, it takes determination, it requires a completely different view on delivering capabilities. Read Derick’s blog post from this past Monday and you will get a sense of our beliefs and approach.
[Today's fun fact: Sauerkraut is also a member of the cabbage family and should not be considered an insult (ref: yesterday's fun fact). It is fat free, low in calories, provides about a third of daily needs of vitamin C in a single cup and contains iron, calcium, potassium, thiamin, riboflavin, niacin and 8 grams of fiber. Americans consume 387 million pounds a year, that is more per capita than Germany. And it was first created in the Alsace in France, not Germany.]
Many banks and financial institutions are experimenting with containers in development environments, but when will they move into production? Containers are seen as the key to achieving the ultimate in information technology flexibility and agility. Containers work on both public and private clouds, and make it easy to build and deploy applications. The challenge for regulated industries is the cost and complexity of container security compliance. VM security compliance is already challenging, ...
May. 24, 2016 09:30 AM EDT Reads: 752
SYS-CON Events announced today that 24Notion has been named “Bronze Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. 24Notion is full-service global creative digital marketing, technology and lifestyle agency that combines strategic ideas with customized tactical execution. With a broad understand of the art of traditional marketing, new media, communications and social influence, 24Notion uniquely understands how to con...
May. 24, 2016 09:30 AM EDT Reads: 1,659
The essence of data analysis involves setting up data pipelines that consist of several operations that are chained together – starting from data collection, data quality checks, data integration, data analysis and data visualization (including the setting up of interaction paths in that visualization). In our opinion, the challenges stem from the technology diversity at each stage of the data pipeline as well as the lack of process around the analysis.
May. 24, 2016 09:15 AM EDT Reads: 752
SYS-CON Events announced today the Docker Meets Kubernetes – Intro into the Kubernetes World, being held June 9, 2016, in conjunction with 18th Cloud Expo | @ThingsExpo, at the Javits Center in New York, NY. Register for 'Docker Meets Kubernetes Workshop' Here! This workshop led by Sebastian Scheele, co-founder of Loodse, introduces participants to Kubernetes (container orchestration). Through a combination of instructor-led presentations, demonstrations, and hands-on labs, participants learn ...
May. 24, 2016 09:00 AM EDT Reads: 1,773
The initial debate is over: Any enterprise with a serious commitment to IT is migrating to the cloud. But things are not so simple. There is a complex mix of on-premises, colocated, and public-cloud deployments. In this power panel at 18th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists will look at the present state of cloud from the C-level view, and how great companies and rock star executives can use cloud computing to meet their most ambitious and disruptive business ...
May. 24, 2016 09:00 AM EDT Reads: 1,965
The demand for organizations to expand their infrastructure to multiple IT environments like the cloud, on-premise, mobile, bring your own device (BYOD) and the Internet of Things (IoT) continues to grow. As this hybrid infrastructure increases, the challenge to monitor the security of these systems increases in volume and complexity. In his session at 18th Cloud Expo, Stephen Coty, Chief Security Evangelist at Alert Logic, will show how properly configured and managed security architecture can...
May. 24, 2016 09:00 AM EDT Reads: 1,920
In his session at 18th Cloud Expo, Andrew Cole, Director of Solutions Engineering at Peak 10, will discuss how the newest technology advances are reducing the cost and complexity of traditional business continuity and disaster recovery solutions. Attendees will: Learn why having a full disaster recovery strategy is more important now than ever before Explore the key drivers of a successful disaster recovery solution Achieve measurable operational and business value from a disaster recovery ...
May. 24, 2016 09:00 AM EDT Reads: 1,187
In his session at 18th Cloud Expo, Bruce Swann, Senior Product Marketing Manager at Adobe, will discuss how the Adobe Marketing Cloud can help marketers embrace opportunities for personalized, relevant and real-time customer engagement across offline (direct mail, point of sale, call center) and digital (email, website, SMS, mobile apps, social networks, connected objects). Bruce Swann has more than 15 years of experience working with digital marketing disciplines like web analytics, social med...
May. 24, 2016 08:45 AM EDT Reads: 912
What a difference a year makes. Organizations aren’t just talking about IoT possibilities, it is now baked into their core business strategy. With IoT, billions of devices generating data from different companies on different networks around the globe need to interact. From efficiency to better customer insights to completely new business models, IoT will turn traditional business models upside down. In the new customer-centric age, the key to success is delivering critical services and apps wit...
May. 24, 2016 08:30 AM EDT Reads: 492
When it comes to IoT in the enterprise, namely the commercial building and hospitality markets, a benefit not getting the attention it deserves is energy efficiency, and IoT's direct impact on a cleaner, greener environment when installed in smart buildings. Until now clean technology was offered piecemeal and led with point solutions that require significant systems integration to orchestrate and deploy. There didn't exist a 'top down' approach that can manage and monitor the way a Smart Buildi...
May. 24, 2016 08:30 AM EDT Reads: 2,018
SYS-CON Events announced today that Hanu Software will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Leveraging best-in-class people, processes, and technologies, Hanu provides high-quality, high-value software development and business process outsourcing services to independent software vendors (ISVs) and enterprises.
May. 24, 2016 08:30 AM EDT Reads: 1,171
The cloud market growth today is largely in public clouds. While there is a lot of spend in IT departments in virtualization, these aren’t yet translating into a true “cloud” experience within the enterprise. What is stopping the growth of the “private cloud” market? In his general session at 18th Cloud Expo, Nara Rajagopalan, CEO of Accelerite, will explore the challenges in deploying, managing, and getting adoption for a private cloud within an enterprise. What are the key differences betwee...
May. 24, 2016 08:00 AM EDT Reads: 1,400
SYS-CON Events announced today BZ Media LLC has been named “Media Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. BZ Media LLC is a high-tech media company that produces technical conferences and expositions, and publishes a magazine, newsletters and websites in the software development, SharePoint, mobile development and Commercial Drone markets.
May. 24, 2016 06:00 AM EDT Reads: 3,362
SYS-CON Events announced today TechTarget has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. TechTarget is the Web’s leading destination for serious technology buyers researching and making enterprise technology decisions. Its extensive global networ...
May. 24, 2016 04:00 AM EDT Reads: 2,992
As machines are increasingly connected to the internet, it’s becoming easier to discover the numerous ways Industrial IoT (IIoT) is helping to shape the business world. This is exactly why we have decided to take a closer look at this pervasive movement and to examine the desire to connect more things! Now if you need a refresher on IIoT and how it is changing the world, take a moment and listen to Greg Gorbach with ARC Advisory Group. Gorbach believes, "IIoT will significantly change the worl...
May. 23, 2016 10:00 PM EDT Reads: 1,757
The pace of innovation, vendor lock-in, production sustainability, cost-effectiveness, and managing risk… In his session at 18th Cloud Expo, Dan Choquette, Founder of RackN, will discuss how CIOs are challenged finding the balance of finding the right tools, technology and operational model that serves the business the best. He will discuss how clouds, open source software and infrastructure solutions have benefits but also drawbacks and how workload and operational portability between vendors...
May. 23, 2016 07:00 PM EDT Reads: 1,716
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York and Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty ...
May. 23, 2016 05:00 PM EDT Reads: 4,606
Enterprise networks are complex. Moreover, they were designed and deployed to meet a specific set of business requirements at a specific point in time. But, the adoption of cloud services, new business applications and intensifying security policies, among other factors, require IT organizations to continuously deploy configuration changes. Therefore, enterprises are looking for better ways to automate the management of their networks while still leveraging existing capabilities, optimizing perf...
May. 23, 2016 04:45 PM EDT Reads: 824
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit y...
May. 23, 2016 04:00 PM EDT Reads: 1,813
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo New York Call for Papers is now open.
May. 23, 2016 03:00 PM EDT Reads: 1,656