One of the various problems we face in the data networking world is the absolute plethora of tunneling technologies we have … [Read more...]



In this post we will look at something which is relatively new but not as cool as my previous post on Segment Routing. We … [Read more...]

Yet another blog about Segment Routing-Part 1

Segment Routing Fig.9

In this blog post we will be taking a deeper look at Node/Prefix SID and SR/LDP Interworking. If you work or have an interest … [Read more...]

RFCs You Should Know: 5218


Quite often RFCs in the "earlier days" discussed not only process but also design. Looking back now, considering the … [Read more...]

ISIS Link-Group

ISIS Link-Group

Introduction On the Core or Edge network, we need more and more bandwidth. For a large service provider, in some parts of … [Read more...]

OpenStack Neutron – The Dirty Network Detail

OpenStack Neutron Networking

Update: I'm slowly getting there, third and more accurate diagram attached below which now includes where security policies, … [Read more...]

BGP RR Design – Part 2

BGP RR Fig.10

This is a continuation from Part 1 9. ACME VPN RR's Design: So the current total number of PE's dedicated for VPN … [Read more...]

BGP RR Design – Part 1

BGP RR Fig.12

1. Introduction In this post we will be looking at large scale RR design by using a fictional ISP ACME  as a reference. As … [Read more...]

IP FRR and Micro-loops Part 2

IP FRR Fig.20

This is a continuation from Part 1 Remote LFA At this point we already know that simple LFA doesn't always provide full … [Read more...]

IP FRR and Micro-loops Part 1

IP FRR Fig.24

Introduction In this post we will take a look at IP FRR and Micro-loops. If the reader already doesn't have some kind of … [Read more...]

HTIRW: The IETF Draft Process

In our deeper investigations of the IETF as a "sample standards body" in this (apparently forever running) series on how the … [Read more...]

Transit vs peering: what makes sense when?


Iljitsch van Beijnum, Network Engineer and author, is our guest blogger today with a post about peering sponsored by Noction … [Read more...]

BGPSEC: Leaks and Leaks


This is the final post in my series on BGPSEC — I will probably follow this up, at some point, with a couple of posts on some … [Read more...]

BGPSEC: Signatures and Performance

BGPSEC is a set of BGP extensions being developed by the SIDR working group of the IETF to improve the security of the … [Read more...]

BGPSEC: Replays, Timers, and Performance


Let's return to our simple four AS network to look at a number of issues with BGPSEC — the bits you won't often hear … [Read more...]