I’m responding to Brad Hedlund’s post “On optimizing traffic for network virtualization” where he seems to missed a key point. It’s about cost of ownership in terms of ability to troubleshoot.
Embrane uses concepts of IP Flows to scale virtual appliances. Embrane does this by managing IP flows and then directing to other appliances, in effect creating what I would call a two tier load balancing.
Wherein I consider using BFD in Network Designs.
In the article, “What Is the Definition of a Switch Fabric ?” on Switch Fabrics I looked at how a Crossbar switching fabric allow for concurrent circuit forwarding and how this is used to build a fabric. In most cases, frames would be received and forwarded from an input to an output, as show in […]
These all suggest that the time for planning and designing Service Modules is over. There are no suggestions that service modules for the Nexus 7000 will be developed that I can see. I can prognosticate that it would slow down the development of the core switch / route / performance functions, and it will be some years before those core capabilities is complete enough that service modules would become viable product development tasks — they might be in development, but not much chance of going into production. [^1]
Do I sound bitter about Service Modules ? A bit. I’ve had a number of hard to solve problems that lasted months before code fixes arrived. I’ve been fan of the NAM but the price is now far removed from it’s practical value. USD$30K List is way over priced for its capabilities and even with a 30% discount, you can buy a lot of network management systems that deliver much better functions and features for that price.
Recently Iíve come across some interesting terms for variants of common network topologies, so I decided I’d try to list as many of them as I can for reference. Please suggest others to add.
A while back Greg wrote a great article about the “Rules of Design Documentation” http://etherealmind.com/rules-design-documentation-etherealmind/ these are really valuable rules when it comes to writing a design document and in my opinion is particularly relevant to a Low Level Design AKA Detailed Design Document. Ask yourself Before you can apply these rules of design you must […]
Easy peasy lemon squeezy This seems a straightforward question! Just load up with advanced IP services license, install the license file and reboot the switch and you should be good to go. Well that’s what I thought until recently when I done the very steps above and on the surface seemed okay but I wanted […]
The current technologies of data centre networks don’t address the fundamental scaling issues. You can’t scale to hundreds of independent switches, we need to have less control planes for more coherent functions. Here is my take on next wave of networking in the data centre beyond DCB and TRILL.
In the recent weeks, J. Michael Metz from Cisco entered a ****ing contest with my friend Greg and decided to prove that the FCoE standards are done.