Understanding the BGP Origin Code Attribute
When you check out a BGP route, you’ll notice several attributes that help routers decide which path to use. The Origin code is one of the simplest and is often overlooked
Internet Architecture
Interconnection, peering, Data centers. How the Internet works. IXPs, transit, and other topics. Routing and Control Planes such as BGP and OSPF protocols. RPKI and IP resources are also covered.
How Peering Can Speed Up Your Enterprise Applications
When your enterprise runs applications that customers or employees rely on every day, speed matters. A slow app can mean lost productivity, frustrated users, and even lost revenue. One way enterprises can improve application performance is through peering.
BGP: What is the no_export Community?
In this post, I will dive into what the no_export attribute is, how it works, and when you should use it.
What to Expect on Your First Data Center Visit
Whether you’re a network engineer preparing for a cross-connect, an IT pro inspecting your new rack space, or a client touring a colocation facility, knowing what to expect can help you make the most of the visit.
First Time Data Center Visit Checklist Patreon Subscribers $3
This content is for Patreon subscribers of the j2 blog. Please consider becoming a Patreon subscriber for as little as $1 a month. This helps to provide higher quality content, more podcasts, and other goodies on this blog.To view this content, you must be a member of Justin’s Patreon at $3 or more Unlock with … Read more
Vendor Quirks & Common Pitfalls in BGP Configuration
In this post, I walk through some key quirks and common pitfalls you might encounter when configuring BGP on MikroTik RouterOS (v6 & v7), Cisco IOS, Juniper Junos, and Arista EOS.
Juniper BGP Configuration .set and templates for my Patreon Subscribers. Free Info Post
I have created a series of example configurations, a commented PDF, and a Juniper .set for configuring BGP on Juniper routers. This post is available for my Patreon folks here.
Juniper BGP Configuration .set and templates for my Patreon Subscribers. $15
This content is for Patreon subscribers of the j2 blog. Please consider becoming a Patreon subscriber for as little as $1 a month. This helps to provide higher quality content, more podcasts, and other goodies on this blog.To view this content, you must be a member of Justin’s Patreon at $15 or more Unlock with … Read more
BGP Filtering Best practices for fun and security
Border Gateway Protocol (BGP) filtering is critical for securing and optimizing internet routing. Improper BGP configuration can lead to serious issues like route leaks, hijacks, or suboptimal routing. Here are the most effective best practices for BGP filtering: 1. Prefix Filtering Objective: Ensure only authorized prefixes are advertised or accepted. 2. AS-PATH Filtering Objective: Prevent … Read more
Enterprise Guide to Selecting a Colocation Data Center
This guide outlines the critical factors enterprises should consider when selecting a colocation partner.
Cisco BGP Troubleshooting: Essential Commands Every Network Engineer Should Know
When BGP (Border Gateway Protocol) misbehaves, the ripple effect can be massive—routes disappear, prefixes flap, and connectivity grinds to a halt. Whether you’re managing a large enterprise edge or an ISP core, knowing how to quickly diagnose BGP issues on Cisco routers is critical. Here’s a hands-on guide to the most useful Cisco IOS BGP … Read more
Border Gateway Protocol (BGP): How the Internet’s Routing Protocol Works
Border Gateway Protocol (BGP) is a protocol that makes the Capital I Internet run. It is the fundamental system that Internet Service Providers (ISPs) and large networks use to exchange reachability information and ensure data finds its way across the complex web of networks making up the global Internet. This post will demystify how BGP … Read more