September 2019 - NetworkGods

Cisco 5520 Wireless Controller Code Upgrade HA

Posted on 27/09/201905/08/2024 by Neofit Solovan

If you’re looking for tips of how to implement a code upgrade on a Cisco 5520 Wireless Controller you are probably working in a medium-large organization as I don’t expect to see a normal guy installing a toy like that in their attic. But you’ll never know.

In my setup I have two Cisco 5520 Wireless Controllers configured for SSO High Availability and they are serving a mix of over…many Cisco Wireless Access Points: Cisco 3502, Cisco 3702 and the mGIG beauties Cisco 3802.
I am upgrading from 8.3.143 to 8.5.135. Please download the code only from Cisco’s official website.

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Cisco 3850 Catalyst Switch code upgrade from 16.x.x

Posted on 25/09/201925/09/2019 by Neofit Solovan

A few days ago I wrote another post showing a way of how to implement a code upgrade for a Cisco Catalyst 3850 Switch from 3.x.x to 16.x.x.
Since the commands to be used are slightly different when upgrading from 16.x.x to 16.x.x (Denali to Denali and so on), I decided to write this down. I know I had some problems when I moved from 3.6.6 to 16.
The below commands can be used for the newer models of switches the Catalyst 9k Series as well.

Cisco 3850 Catalyst Switch code upgrade from 16.x.x to 16.x.x

Centos 8 is now available for download

Posted on 24/09/201905/08/2024 by Neofit Solovan

As you all now, on 24th of September 2019 the long awaited CentOS 8 has been released.

It can be downloaded via the official CentOS page.
If you’re just looking for a CentOS 8 x86_64 image, download it from here.

Centos 8 Download

CentOS 7 NTP Server Configuration

Posted on 22/09/201925/09/2019 by Neofit Solovan

If you’re reading this you probably know already what an NTP server is. However, long story short NTP stands for Network Time Protocol, used for clock synchronization most of the times in client-server scenarios. It uses UDP port 123. Easy. For a CentOS 7 NTP Server, read below.

CentOS 7 NTP Server and Google NTP Servers

Cisco 3850 Switch Code Upgrade 3.x.x to 16.x.x

Posted on 22/09/201922/09/2019 by Neofit Solovan

Right, this is a fairly easy procedure. However, when I first touched an IOS-XE bin image I managed to nicely transform a stack of 3 x Catalyst 3850 into a lovely expensive brick. This happened back in 2014 only because I thought I have to change the boot statement to “tell” the stack what file to use to boot. I was very wrong and that caused me a lot of pain and misery. I also hit a bug with that particular version of code. About bugs, in a different post.
Just double check the running version of code, make sure you’re on 3.x.x and follow the below steps:

Cisco Catalyst 3850 stack — A switch stack of a few Cisco Catalyst 3850, including a Catalyst 12x48U.