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IOS XE also runs a separate driver instance for each blade, thus one blade driver crashing does not crash any others that use the same driver, this is because they run their own instance of the driver. Monolithic IOS runs all of the processes in one memory space, thus if the kernel crashes or has …
Continue reading "1.1.a (ii) Impact to Troubleshooting and Performance"
IOS-XE is able to have better logical and especially physical separation of the three planes. For example a chassis is able to have 3 blades, one dedicated to control plane, one to data plane, and one to the management plane. Granted that is a glorified example, it's possible. Since IOS XE runs a linux operating …
Continue reading "1.1.a (i) Control plane and Forwarding plane"
Cisco moving to different operating systems for their networking devices should come as no surprise. When comparing traditional or monolithic IOS to Juniper or Arista, we find IOS lacking. Specifically we find it lacking in the areas of scripting, programing, and just being able to do more. For the purpose of the CCIE, we should …
Continue reading "1.1.a Describe basic software architecture differences between IOS and IOS XE"
OSPF offers us 4 kinds of authentication when studying the CCNA and CCNP we really only hear/read about 3, the fourth SHA, is fairly new. Here's the complete list of available authentication for OSPF. NULL (no authentication) cleartext (packet capture reveals the password) MD5 (creates a 128bit fingerprint of the password, click here to read …
Continue reading "How to Configure OSPF Authentication – Complete Guide"
The goal of this article is to provide you with a pre-built LibreNMS. This image should require very little tinkering, This VM is not meant to be publicly accessibly, it should only be used internally to get you working, feel free to improve it. I'm going to go over the setup in this article. The …
Continue reading "Pre-Built LibreNMS OVF with Oxidized + Ryslog + 1 Min Polling"
This article will show you how to quickly install all of the nagios plugins with Librenms, On CentOS 7. First install nagios-plugins-all yum install nagios-plugins-all.x86_64 -y In the Libredocs they say that this is installed in /usr/lib/nagios/plugins, however mine was installed in /usr/lib64/nagios/plugins https://docs.librenms.org/Extensions/Services/ Anyway, now you need to add two lines into your LibreNMS …
Continue reading "How to Install Nagios Plugins for LibreNMS On Centos 7"