I am still pleasantly surprised that the title of this show “Intelligent Switches Come out of the Closet” has not been yanked by our censors. The show is a good one of course, and double entendre aside, this notion of moving out of the switching closet and putting switch resources right at a critical point of entry is exactly what we are talking about. This is another of our three shows taped at CiscoLive in London, the Borderless team released a new line of ‘compact switches’ purpose-built for a very unique environment.
You can watch the full show by clicking here (this link will take you into our virtual environment which does require registration the first time you go…nice thing is you only have to do this once and you can poke around to see the rest of our content).
From my home network, I can successfully ping or traceroute to some IPv6 hosts, but I cannot subsequently open a web page or use other applications with it. How can this be? Maximum Transmission Unit (MTU) gotchas…
There is a subtle difference between IPv4 and IPv6 fragmentation strategies. IPv4 routers fragment traffic in the network when needed and then the receiving host reassembles those fragments. This generally works well, but there are a number of potential issues. Because of these issues, the IETF developed means for higher layer protocols such as TCP to determine the smallest MTU on a path and send appropriately sized datagrams in order to avoid fragmentation. The IPv6 designers presumed the presence of this Path MTU Discovery so that in IPv6, fragmentation no longer happens in the network but only at the hosts -- and then only in special cases in that absolutely require it.
So here we are, in the middle of March Madness. Lots of people that don’t normally follow college basketball, but still a great social environment and an opportunity to get together and pretend we know the teams we all picked in our brackets. Sometimes we pick based on “loyalty” and other times there are other reasons. We all have various “borders” we deal with every day.
So, bring onBorderless Networks. In the manufacturing area we still tend to think of a “border” between the factory and the business. After all, how can those people in the front office know what we need in the factory, right? Well, that separation gets smaller and smaller every day. Why? Because we’ve blurred the border. Sure, there are appropriate firewalls and security between the various layers. But every day we run into people that tell about needing data from the plant, from the machine, from the supplier, from the sales force, from the channel, from the customer. And sometimes we’re not in the office, we may be at home, at a different supplier, in an airport, at a concert or ball game with our kids.
The point becomes, there is data there and I am not there but I need to make a call and affect my plant productivity or answer a question from my CEO because there is a big opportunity or a major customer disappointment about to happen.
My distant relative - Flight Lieutenant KJP Granger (Royal Air Force) and his DH82A Gipsy Moth - did the forerunner of RFID save him from being shot down?
Some of the best technological advances are made during times of conflict. Sad that it should be so, but the silver lining is that many of the advances are focused on defending, protecting and shielding people. Active RFID, the kind of solution provided by Cisco and AeroScout, in many ways started out that way.
Looking back decades to WWII, radar was already being developed in ernest by the British in the run-up to the second world war. Many countries were developing radar at that time, but most folks agree that Robert Watson Watt, later Sir Robert, was the prime mover-and-shaker. It took US marketing (in the form of the US Navy) to coin the term RADAR, for radio detection and ranging.
So where does Context Aware Location RFID come in? Well, whilst radar itself was useful, the British needed to know whether those planes coming over the English Channel were returning Spitfires and allied bombers, or attacking Luftwaffe aircraft. It was the same Watson-Watt that helped produce the ‘Identification friend or foe’ (IFF) system that used a transponder on the allied aircraft that was ‘excited’ by the radar system and actively sent back a signal to the base saying friend. My own cousin, Flight Lieutenant KJP Granger, Officer Trainer RAF, was grateful for that!
Now fast forward decades to today. The technology for today’s RFID is a little different, but the concept is the same. So let’s keep the aeronautical theme going and talk about Boeing and its use of RFID.Read More »