Flooding Domains versus Areas
At a fundamental level, OSPF and IS-IS are similar in operation. They both build neighbor adjacencies. They both use Dijkstra’s shortest path first (SPF) to find the shortest path to every destination in the network. They both advertise the state of each link connected to a network device. There are some differences, of course, such as the naming (OSI addresses versus IP addresses, intermediate systems versus routers). Many of the similarities and differences don’t play too much in the design of a network, though.
One difference that does play into network design, however, is the way in which the two protocols break up a single failure domain into multiple failure domains. In OSPF we have areas, while in IS-IS we have flooding domains. What’s the difference between these two, and how does it effect network design? Let’s use the illustration below as a helpful reference point for the two different solutions.
In the upper network, we have an illustration of how OSPF areas work. Each router at the border of a flooding domain (an Area Border Router, or ABR), has a certain number of interfaces in each area. Another way of saying this is that an OSPF ABR is Continue reading
Flooding Domains versus Areas
At a fundamental level, SPF and IS-IS are similar in operation. They both build neighbor adjacencies. They both use Dijkstra’s shortest path first (SPF) to find the shortest path to every destination in the network. They both advertise the state of each link connected to a network device. There are some differences, of course, such as the naming (OSI addresses versus IP addresses, intermediate systems versus routers). Many of the similarities and differences don’t play too much in the design of a network, though.
One difference that does play into network design, however, is the way in which the two protocols break up a single failure domain into multiple failure domains. In OSPF we have areas, while in IS-IS we have flooding domains. What’s the difference between these two, and how does it effect network design? Let’s use the illustration below as a helpful reference point for the two different solutions.
In the upper network, we have an illustration of how OSPF areas work. Each router at the border of a flooding domain (an Area Border Router, or ABR), has a certain number of interfaces in each area. Another way of saying this is that an OSPF ABR is Continue reading
Kiev, Ukraine: CloudFlare’s 78th Data Center
Здоровенькі були! CloudFlare just turned up our newest datacenter in Kiev, the capital and largest city of Ukraine.
Kiev is an old city with more than 1,000 years of history. It was the capital of Kievan Rus’, an ancient country which is considered to be the ancestor of modern Ukraine, Belarus and Russia. If you visit the city by plane, you may be almost blinded by the shining golden domes of numerous old churches and cathedrals - and once there, be sure to try the famous Ukrainian beet soup, “Borscht”. CloudFlare decided to contribute to the long history of Kiev with our 22nd data center in Europe, and our 78th data center globally.
Localizing content
Frankfurt is arguably the biggest point of interconnection in the world, and is home to Deutscher Commercial Internet Exchange (DE-CIX) which plays an absolutely critical role and sees close to 5Tbps in traffic. While this is great if you live near Frankfurt, it is also where most traffic is exchanged for other parts of Germany, large parts of Europe (think Austria, Bulgaria, Czech Republic, Denmark, Estonia, Finland, Greece, Hungary, Italy, Kazakhstan, Lithuania, Montenegro, Norway, Poland, Romania, Serbia, Turkey, Ukraine, etc.), and even countries such Continue reading
The Once And Future IBM Platform
More than anything else, over its long history in the computing business, IBM has been a platform company and say what you will about the woes it has had through several phases of its history, what seems obvious is that when Big Blue forgets this it runs into trouble.
If you stare at its quarterly financial results long enough, you can still see that platform company looking back at you, even through the artificially dissected product groups the company has used for the past decade and the new ones that IBM is using starting in 2016.
It is important to …
The Once And Future IBM Platform was written by Timothy Prickett Morgan at The Next Platform.
Sponsored Post: Aerospike, TrueSight Pulse, Redis Labs, InMemory.Net, VividCortex, MemSQL, Scalyr, AiScaler, AppDynamics, ManageEngine, Site24x7
Who's Hiring?
- Software Engineer (DevOps). You are one of those rare engineers who loves to tinker with distributed systems at high scale. You know how to build these from scratch, and how to take a system that has reached a scalability limit and break through that barrier to new heights. You are a hands on doer, a code doctor, who loves to get something done the right way. You love designing clean APIs, data models, code structures and system architectures, but retain the humility to learn from others who see things differently. Apply to AppDynamics
- Software Engineer (C++). You will be responsible for building everything from proof-of-concepts and usability prototypes to deployment- quality code. You should have at least 1+ years of experience developing C++ libraries and APIs, and be comfortable with daily code submissions, delivering projects in short time frames, multi-tasking, handling interrupts, and collaborating with team members. Apply to AppDynamics
Fun and Informative Events
- Discover the secrets of scalability in IT. The cream of the Amsterdam and Berlin tech scene are coming together during TechSummit, hosted by LeaseWeb for a great day of tech talk. Find out how to build systems that will cope with constant change and Continue reading
Worth Reading: Declaring IPv6 an Internet Standard
The post Worth Reading: Declaring IPv6 an Internet Standard appeared first on 'net work.
New Poison Ivy Activity Targeting Myanmar, Asian Countries
The infamous Remote Access Trojan (RAT) Poison Ivy (hereafter referred to as PIVY) has resurfaced recently, and exhibits some new behaviors. PIVY has been observed targeting a number of Asian countries for various purposes over the past year. Palo Alto Networks’ Unit 42 recently blogged about a new Poison Ivy variant targeting Hong Kong activists […]DemoFriday with Netronome & Ericsson: Improve Performance & Flexibility of Telco NFV with Intelligent Server Adapters
Achieve up to 5X lower TCO for SDN and NFV applications with hardware-based acceleration of virtual switch processing.