W17BS

SR-ODN with L3VPN

Segment Routing Traffic Engineering with BGP On Demand Nexthop

Posted on July 9, 2022

Short blog post diving straight into the technical parts. The base topology here is just a flat level-2 IS-IS IGP with Segment Routing enabled, prefix-sid configured on all loopbacks (Node SID) and 10.0.xy.x/24 & 2001:db8:xy::x/64 configured on p2p where x = lowest router # on the segment, y = highest... [Read More]

Deploying a FastAPI based application for FreeRADIUS

HTTP endpoints make life easier

Posted on May 23, 2022

I’ve built a FastAPI app which you can run on your FreeRADIUS servers to handle the interaction between external scripts/os/bss and the database. This also includes returning data in a presentable format instead of having to correlate users and groups to specific attribute pairs stored in the radcheck/radreply/radgroupcheck/radgroupreply tables. (Also... [Read More]

My experience with trying to design a BNG infrastructure (#1)

Probably a very long and boring post about IPoE and DHCP

Posted on May 14, 2022

NOTE: This will be a multi-part post because there is too much to cover in 1 sitting… [Read More]

Unified MPLS Study Session

CCNP/CCIE Service Provider Exam (v5) - Study with me

Posted on December 28, 2020

SPCOR (350-501) objective 3.1.d Unified MPLS [Read More]

L3VPNs - Route Target Constraint (RTC)

IOS-XR L3VPN quick tips

Posted on December 13, 2020

I’ll be trying a new approach instead of writing a full detailed blog, each subject that I am going through will be recorded here on my blog without going into too much detail but I will provide screenshots of pcaps/highlight the important areas of the packet that I am talking... [Read More]

Automating basic BGP Flowspec rules with Python and ExaBGP

Well, it isn't completely "automated".

Posted on November 22, 2020

BGP - Border Gateway Protocol. You’ve heard of it, I’ve heard of it, we’ve all configured it in a lab or in production using our favorite terminal emulator over SSH, heck even Telnet if you’re a mad man, or even Netconf if you’re too cool for the CLI. [Read More]

Automating Grafana Dashboards with Python + Netbox

Why faff around when you can write a few lines of code?

Posted on September 26, 2020

Netbox is cool and all… It’s a neat little IPAM (with other features integrated) and is extremely easy to spin up a pre-built docker container for experiemental purposes. Many months ago, I was tasked to set up a tool called Grafana. I’ve never heard of this tool before and at... [Read More]

Imagine building your own MPLS-TE/SR-TE Controller

Sounds pretty cool right?

Posted on July 31, 2020

Just imagine… Not having to pay $75,000 per year for a controller that is literally built to just steer traffic throughout your MPLS/SR domains? Well, this isn’t the place you will find that information… However, you are not here to read a blog where I complain about the different controllers... [Read More]

IS-IS Multiarea/level SPF Convergence

One of the boring (exciting) parts of studying...

Posted on July 3, 2020

A warning prior reading this blog: There is a lot of output snippets from various show commands… [Read More]

Cisco XR YDK Useful Modules

A list and examples of useful modules in Python

Posted on June 27, 2020

I’m sharing this list because of the amount of trouble/time it has taken me to find useful modules for help the average netconf/yang virgin that is unable to find a good example on configuring devices running Cisco XR or even just reading information such as interface configurations, IGP configs, implementing... [Read More]