Packet loss with Fast Reroute!
Do we still lose packet with fast reroute? One of my students asked me this question. And I would like to share the answer with everyone.
I discussed some IP Mobility solutions including LISP!
Couple days ago I discussed some IP Mobility solutions, including LISP (Locator Identity Separation Protocol) with the CCDE students.
CCDE Before and After!
Don’t expect technical topic in this post. Instead I wanted to show how was my situation before and after the CCDE – Cisco Certified Design Expert !. Enjoy 
Fast Convergence and the Fast Reroute – Definitions/Design Considerations in IP and MPLS
Fast Convergence and the Fast Reroute Network reliability is an important design aspect for deployability of time and loss sensitive applications. When a link, node or SRLG failure occurs in a routed network, there is inevitably a period of disruption to the delivery of traffic until the network reconverges on the new topology.
TIP Plugs Critical Mass, Expands Community Labs
Technology prototypes tested and validated by the group are now commercially available and being...
© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.
Can We Really Use Millions of VXLAN Segments?
One of my readers sent me a question along these lines…
VXLAN Network Identifier is 24 bit long, giving 16 us million separate segments. However, we have to map VNI into VLANs on most switches. How can we scale up to 16 million segments when we have run out of VLAN IDs? Can we create a separate VTEP on the same switch?
VXLAN is just an encapsulation format and does not imply any particular switch architecture. What really matters in this particular case is the implementation of the MAC forwarding table in switching ASIC.
Read more ...Scaling symbolic evaluation for automated verification of systems code with Serval
Scaling symbolic evaluation for automated verification of systems code with Serval Nelson et al., SOSP’19
Serval is a framework for developing automated verifiers of systems software. It makes an interesting juxtaposition to the approach Google took with Snap that we looked at last time out. I’m sure that Google engineers do indeed take extreme care when building the low level networking code that powers Google’s datacenters, but their fundamental design point was to enable frequent releases for fast iteration, feedback on their designs, and yes, early detection of problems.
Formal verification is at the other end of the spectrum. In theory it enables you to eliminate whole classes of problems and vulnerabilities entirely (in practice perfection is still hard to come by), and so it can be especially valuable in security sensitive situations. But it comes with a very high price tag:
Writing proofs requires a time investment that is usually measured in person-years, and the size of the proofs can be several times or even more that an order of magnitude larger than that of implementation code.
That’s both very expensive and an incredibly long wait for feedback. To invest in formally modelling something, you really Continue reading
Using Kustomize with Cluster API Manifests
A topic that’s been in the back of my mind since writing the Cluster API introduction post is how someone could use kustomize to modify the Cluster API manifests. Fortunately, this is reasonably straightforward. It doesn’t require any “hacks” like those needed to use kustomize with kubeadm configuration files, but similar to modifying kubeadm configuration files you’ll generally need to use the patching functionality of kustomize when working with Cluster API manifests. In this post, I’d like to take a fairly detailed look at how someone might go about using kustomize with Cluster API.
By the way, readers who are unfamiliar with kustomize should probably read this introductory post first, and then read the post on using kustomize with kubeadm configuration files. I suggest reading the latter post because it provides an overview of how to use kustomize to patch a specific portion of a manifest, and you’ll use that functionality again when modifying Cluster API manifests.
A Fictional Use Case
For this post, I’m going to build out a fictional use case/scenario for the use of kustomize and Cluster API. Here are the key points to this fictional use case:
- Three different clusters on AWS are needed. The Continue reading
Scavolini Realizes the Value of Architectural Simplicity Across Data Centers
Growth in the new era of digital business is built on three pillars: providing the best customer experience, supporting continuous...Heavy Networking 485: Understanding Edge Exchanges
Guest Alex Marcham returns to Heavy Networking to explore edge exchanges. Like Internet exchanges, the goal of an edge exchange is to provide direct interconnection and traffic exchange between provider networks, but edge exchanges move that infrastructure closer to end users. Alex walks us through how these exchanges work.
The post Heavy Networking 485: Understanding Edge Exchanges appeared first on Packet Pushers.
Michael Dell: The Future of Tech Is Autonomous
Dell Technologies announced an on-demand buying model for its products and autonomous...
© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.
Oil And Gas Giants Build Up Their Strategic GPU Reserves
When you are always looking for what platform architecture will be mainstream, you have to look at what those on the bleeding edge are doing to see what the leading edge might do, which in turn tells you what everyone else might eventually do. …
Oil And Gas Giants Build Up Their Strategic GPU Reserves was written by Timothy Prickett Morgan at The Next Platform.
Tech Bytes: Enabling Agility And Security With Tufin Policy Automation (Sponsored)
On today's Tech Bytes, our sponsor is Tufin, and we’re going to dig into the concept of agility in the enterprise, particularly as organizations adopt cloud services and container-based applications. Our guest is Aleck Brailsford, Director of Sales Engineering for the Americas at Tufin.Tech Bytes: Enabling Agility And Security With Tufin Policy Automation (Sponsored)
On today's Tech Bytes, our sponsor is Tufin, and we’re going to dig into the concept of agility in the enterprise, particularly as organizations adopt cloud services and container-based applications. Our guest is Aleck Brailsford, Director of Sales Engineering for the Americas at Tufin.
The post Tech Bytes: Enabling Agility And Security With Tufin Policy Automation (Sponsored) appeared first on Packet Pushers.
The HPC Community Should Lead In Composability
It is a rare HPC cluster that is actually upgraded – meaning some of the components in the servers or the networks or the storage that comprise the system are swapped out somewhere about halfway through its lifecycle and replaced with cheaper, faster, or more capacious components. …
The HPC Community Should Lead In Composability was written by Timothy Prickett Morgan at The Next Platform.
TM Forum Claims Open API Adoption Up Amid Vendor Lag
More than 50 communications service providers and technology companies have signed on to TM Forum's...
© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.
Telefónica Commits to TIP’s Open Mobile Transport Tech
The carrier says it will be commercially deploying the open mobile transport protocol at scale in...
© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.
Sponsored Post: Fauna, Sisu, Educative, PA File Sight, Etleap, PerfOps, Triplebyte, Stream
Who's Hiring?
- Sisu Data is looking for machine learning engineers who are eager to deliver their features end-to-end, from Jupyter notebook to production, and provide actionable insights to businesses based on their first-party, streaming, and structured relational data. Apply here.
- Triplebyte lets exceptional software engineers skip screening steps at hundreds of top tech companies like Apple, Dropbox, Mixpanel, and Instacart. Make your job search O(1), not O(n). Apply here.
- Need excellent people? Advertise your job here!
Cool Products and Services
- Stateful JavaScript Apps. Effortlessly add state to your Javascript apps with FaunaDB. Generous free tier. Try now!
- Grokking the System Design Interview is a popular course on Educative.io (taken by 20,000+ people) that's widely considered the best System Design interview resource on the Internet. It goes deep into real-world examples, offering detailed explanations and useful pointers on how to improve your approach. There's also a no questions asked 30-day return policy. Try a free preview today.
- PA File Sight - Actively protect servers from ransomware, audit file access to see who is deleting files, reading files or moving files, and detect file copy activity from the server. Historical audit reports Continue reading