Over the last two years or so, I have been on adventure with Data Centre Infrastructure renewal. As past posts may allude to, ACI was a big part of what we did, but before anyone gets all dogmatic about it, know that we didn’t go “All in” with that one product, since I personally don’t subscribe to the “DC Fabrics cure all ills” mantra.

CLOS fabrics and the various approaches to overlays within them are great at providing stable platforms with predictable properties for speed, latency and scale. Unsurprisingly, they go on to do a great job in server farms that can make the best use of that flexibility. During recent conversations on DC refresh, our Arista friends have been extremely keen to try and get us to run our Internet BGP border on the fabric as well. The 7280SR2K can handle 2M routes in FIB they say, just lob stuff into a VRF, bit of policy and voila. Yeah.

So I bought my ACI bundles so long ago that they’re still running 1.0(3f). Right now mainline is 1.2(1k), so i’m a bit behind.

Using the official Cisco doc I did the first staged upgrade from 1.0 to 1.1 using the Web GUI. I wanted to see what happened in a visual sense.

Basically you setup a connection between the APIC and a host that has staged the firmware files, then you setup a policy defining what versions the fabric should be on, and when that should be made active. For me it was 1.1(4f) and now basically.

Today I was reminded what a great git of Kit the really is. Its essentially a box that gives you Serial Access to a device via an RJ45 (Cisco pin-out) using WiFi, Bluetooth or wired, using a web GUI, or a bonkers driver setup on your machine.

For me, I use the AirConsole at work in a jack of all trades way.

• I cable the Serial Dongle to the Router
• I have a WiFi client profile configured that will auto join my (pervasively configured) corporate dirty network.
• I have a WiFi AP setup in the AirConsole that securely presents a new network that I can join to access the Serial Port
• I have NAT configured on the AP->Client WiFi so that I can still access the internet from that client Laptop
• I have the Ethernet port configured to bridge with the AP interface, so I can get a wired device to connect to the Serial setup, and the internet.

So, most of the time what I find myself doing is plugging in the AirConsole, then going to a nearby desk and connecting to the AirConsole Web interface via HTTPS over the dedicated WiFi. I can then configure my box, and still access the internet.

Ick, I know.

Python has long been the language of choice for engineers looking to make their day go that little bit quicker or easier. With deepening skill levels, more and more complex repetitive tasks can be disected and segmented into functions and reuable code, such that a competent scripting engineer can go from blank page to automated process in a matter of hours in most cases. It is for this reason that I sit here to write this - an advocacy for ALL Cisco engineers to down tools and spend however long you need to get good at this.