So I am in the lucky position that in the past few weeks I’ve been working with the DNA-Center solution in different ways in a primarily automation focused project. One of the new philosophies of the Cisco DNA-C BU is to deliver updates more frequently and in a micro-update based strategy. E.g. if a package has a bug, only that package can be updated, on the fly. So DNA-Center needs to have a connection to the Internet. And it’s time to share my experiences. Continue reading “updating DNA-Center experiences”
In a previous blog post I explained that Intent Based Networking not only intoduces new technology but that it also requires change in the way we operate network infrastructures. And that it is in fact a journey, but how do you get started on that journey? With your existing network infrastructure? It’s impossible to throw away every piece of equiment and design and start greenfield.
My wireless network has been based on a WLC2504 controller with two 2602 AP’s. The network has been running quite well, with of course the caveats that came with the different WLC releases. With the maturity of Mobility Express (ME), the need for a dedicated controller for such as small sized wireless network has basically become obsolete as one of the AP’s becomes the master controller in the network. I was able to acquire 2 1852 AP’s with ME, time to upgrade my wireless network to 802.11ac with ME..
Continue reading “Deploying a Cisco Mobility Express network”
Green IT was one of the hot issues back in 2009 during the hype of server virtualization and the introduction of 10 Gig. During the Cisco Networks in 2009 (Barcelona) Cisco EnergyWise was then greatly pushed as an innovation and as a cornerstone for Smart Buildings and Green IT.
The principle thought behind the technology is that the network can also communicate with the endpoints connected to the network and that the network can ask / tell the endpoints to lower down the power consumption in order to reduce the power footprint of the environment. For example, at night time IP Phones in an office network don’t need to have full power, as nobody is working. So EnergyWise can power down the IP phones during the night.
Continue reading “My first steps with EnergyWise”
Cisco introduced Digital Network Architecture (DNA) last year as a new architecture for the digitialized agile world that is becoming a reality at a very fast pace. The DNA is built upon design principles such as security everywhere, automation (enabling centralized service management), virtualize everything, analytics and openness. Key to these design principles is that software is not only defining the datacenter (SDN), the WAN (SD-WAN) anymore but also the access layer. So it should be possible to deploy any service anywhere in your network, whether it’s in your Datacenter, the cloud or at the branch.
Continue reading “Cisco enables a mini (mini) cloud at the branch”
I recently ran across the following issue on a DMVPN Hub-Spoke network with some sites. The network was behaving perfectly fine and spokes were happily communicating with the servers behind the hub until windows 10 came along… Continue reading “Windows 10, Delivery Optimization, SSDP and blocking multicast”
With the advance of vDSL, Fiber, cable Internet and the appropriate SLA’s bussiness Internet connections have become increasingly reliable. By choosing the local ISP’s carefully it is much more interesting for a company to replace the MPLS connections for an Overlay network based on redundant Internet connections. As a result businesses quite often obtain a higher speed connection for much lower rates. One of the business cases I made in 2006/2007 had a 70% decrease in annual costs compared to their European WAN line based on an MPLS service provider including High Availability. Continue reading “DMVPN DualHub EIGRP Traffic Engineering”