Cisco DNA (Digital Network Architecture) Center is an all-in-one physical appliance (as of this writing), which works off "Intent Based Configuration" its own Proprietary "Single Glass Pane" GUI, which allows for Centralized Automation of the entire network and all network elements. What all DNA Center does for a network and what "Intent Based Configuration" is … Continue reading ENAUTO – DNA Center Fundamentals, Architecture, DNA Specific APIC / API, ISE Security Services, and lots of other info!
Like an API Free running through our networks, being driven by software, woohoo! I will jump right into it as this is still the intro to Network Automation and fundamentals material, which is starting to go from things I've already known about SDN Networks, to newer topics so I am excited to keep marching forwarding … Continue reading ENAUTO – Traditional vs SDN Network, Controller Based Architecture, SDN Controllers relation to Mgmt / Control / Data Planes, and API directions!
I will start with the very fundamentals of what / why Network Automation is around today, and then go further into some concepts regarding it. Network Automation - What goals does it achieve? Reducing node by node updates with bulk updates to the network Eliminate repetitive tasks entirely Standardize the network and documentation (consistent images … Continue reading ENAUTO – Fundamentals and Introduction to all things Automation!
GIT is something you will need to be able to work with, as this is how you will find your own needed Data Model Templates in Code Repositories such as GitHub or BitBucket, so I wanted to hit this topic hard and keep everything as concise as possible. Developers do not need to be on … Continue reading ENAUTO – Working with GIT (and installing it in Linux), Terminology Discussed, and a look at different Branching and Merging concepts!
I see a mention of "linuxconfig.org" in this image, I personally "borrowed" it from askubuntu.org, so go view both those websites and sign up for stuff and buy lots of souvenirs on your way out the door. This can go from Top - Down, Bottom - Up, in this case it goes from Left to … Continue reading Linux – A history of Linux vs Unix, File System review, and how to manipulate it using the Bash Shell to manipulate it!
I am not sure how deep I am going to dive into the Linux realm, as I do not intend to go so far as to go through a Linux+ certification course for a Linux Admin, but I did purchase David Bombal's Linux for Network Engineers course on Udemy. This will not be structured labs … Continue reading Linux – A quick look at Ubuntu Linux (one of many flavors) Desktop, Bash Shell, and how they compare to Cisco’s own IOS!
Join me on reddit.com/r/ENAUTO to chat with a community of Automation geeks! After a decade of the Cisco IOS CLI command prompt, I am trading it in for Bash Shell, Python Terminal, and anything else that will give me a blinking cursor to program something to automate part of the network 🙂 I have just … Continue reading Changing Exam Track to ENAUTO 300-435 and also starting a reddit community r/ENAUTO for those interested in joining!
Above is the lab that this post turns into pretty fast once the MPLS is live and installs itself around on EIGRP routers, lots of good info, I advise trying to make through this post if you are rusty on EIGRP Path Selection configuration! 🙂 How EIGRP Calculates Metrics, Topology Table, and Feasibility Condition By … Continue reading EIGRP – Metric review, random “offset-list” lab for Path Selection, Feasibility Condition and Variance discussion, and will PBR config override offset-list?
I have added loopbacks to simulate some EIGRP Networks behind our two Stub routers, to demonstrate some different concepts such as Summary Address and Leak-Maps, however I will start right at the beginning of EIGRP Stub routing and what it does. My labbing kind of got long winded but I really wanted to drive some … Continue reading EIGRP – Stub review, default behaviors, basic configuration, Summary-Address and Leak-Maps config, and verification!
Using this Topology I will work across the EIGRP Domain using EIGRP Named Mode, possibly mixing some "Classic" mode EIGRP Routers in there as well, just to see how things are different once I've gotten into a Named Mode groove of configuration. Honestly before running through this lab (when studying for my CCNP R/S) I … Continue reading EIGRP – Quick review of EIGRP Named Mode, walk through of “Named Mode” EIGRP Configuration with Authentication across the entire EIGRP AS 100 Domain!
The need for BFD (Bidirectional Forwarding Detection) is configured to speed up the "Detection" of a link down, which is 15 seconds by default without any Routing Protocols Hello / Dead Timers triggering this re-convergence (finding an alternate path), which now adays might as well be 15 hours. Now of course this can be solved … Continue reading BFD – (Bidirectional Forwarding Detecetion) review, what problem it solves, configuration, and verification!
VRF-Lite is quite literally a light weight version of VRF Instances, where instead of using VRF to accomplish complex configurations, it simply segregates IP Routing / Instructs Physical Interfaces to use the specific VRF Route Table needed to function. Quick guide to configuring the above Topology with VRF-Lite First you will want to use "ip … Continue reading VRF-Lite – Full review of VRF-Lite, how it differs from VRF, and configuration / verification commands for exam day!
Wanted to cover this in a non-fancy lab, very straight forward, as this is a very forgettable subject for me as you kind of set it and forget it on real life networks. What IP SLA is and how it can be used to optimize your network Not to be confused with "Tracking Objects" for … Continue reading IP SLA – Covering ENARSI topics of configuring SLA to detect jitter, tracking objects, delay, connectivity issues!
No PE to CE Adjcancencies, we are getting this entire lab rocking, tonight! 🙂 I don't usually blow away labs as I learn along the way, as I essentially turned all customer into 1:1 mappings across the MPLS, and its just not worth your time reading (you can refer to here for 1:1 Customer mappings). … Continue reading MPLS – Re-Engineering a 1:1 Customer MPLS L3 VPN Tunnel to serve entire company, tons of ENARSI Topics included in lab, including gotchas for exam day! 🙂
I have a confession to make - While studying MPLS I largely overlooked the configuration of the Provider Edge because of its complexity and ease of breaking all routing (and probably reversing time). I intentionally used my MPLS Lab for ENARSI 300-410 study with new IP Schemes / CE Protocols to challenge my knowledge of … Continue reading MPLS – A necessary closer look at the PE Router settings (VRF / BGP / VPN / Address Family) to see how to setup for new lab!