Routing

This month RFC 10005 quietly became a Proposed Standard.

Founded by Kunihiro Ishiguro and Yoshinari Yoshikawa the founders of GNU Zebra, came together to form IP Infusion back in 1999 as a commercial-grade, hardware-independent networking software company.

BGP Communities has to be one of my favorite features added to the BGP protocol.

Before we get into the how, let’s talk about the why.

Quite a while ago I had a need for some network duct tape… Policy Based Routing while useful should only IMHO be used as a temporary fix.

As I feel this may be a regular section of the blog due to my lack of availability. Please suggest a better name for this “series”.

As many of you may know, I’m in the middle of a huge network redesign, last week our new firewalls finally arrived and it became time for us to start migrating services onto the edge network I’ve been …

Rather quietly, at least I never heard anything, on July 29th, Cisco released NX-OS Version 5.2(1) for the Nexus 7000 platform.

IP SLA is a function of Cisco’s IOS enabling you to analyze a Service Level Agreement (SLA) for an IP application or service.

update · 2026-10-08 This post sat here for fifteen years with some real multicast mistakes in it, mostly in the PIM-SM walkthrough where I had the wrong routers sending the wrong messages, and Fredrik …

Most enterprise networks use BGP to peer with their Internet Service Providers if they want to be multi-homed.

Striving to reach that last 9? Looking for a way to increase your uptime while still being able to do maintenance on your network? Wish you could shutdown your OSPF neighbors like your BGP peers?

Bidirectional Forwarding Detection (BFD) is a UDP-based protocol that provides fast (very fast!) routing protocol independent detection of layer-3 next hop failures.

At times, the ‘rules of BGP’ don’t fit the needs of our productions networks. When we get into today’s production networks how often do book configurations apply? I’ll tell you one thing.

Policy based routing is the process of altering a packets path based on criteria other than the destination address, commonly referred to as ‘policy routing’.

Recently a “colleague”, I use that term very loosely here, was reviewing my recommendations for changes on his network.

One of the most common questions I get concerns path selection within the router.

For some, BGP is a rather large obtrusive beast of a protocol that scares them half to death.

One of the things I used to deploy frequently at my previous position was transport for other ISPs and businesses.

Recently one of my clients asked me to help resolve an issue at an aggregation point on their network.

One of the questions I get asked several times a week by my clients is as such.