CCIE Service Provider Journey

Here is an update - few years later I still haven't received my number. I tried to pass the lab few times (was it 2 or 3?) but it was q...

Looking for IPv6 config for the Cisco IOS router? Here it is! Here is an example of Comcast IPv6 config I have at home. I have the router...

Simple bash script for Cisco USB console. It dynamically inserts device number into screen argument - very handy. Works only for one conne...

Redistribution of EIGRP routes into MP-BGP seems to be very simple process. However, I spent 40 minutes troubleshooting the issue. Simple...

We are coming to the IOS XR. Personally, I like this OS and can recommend to start from the IOS XR Fundamentals book. This post cove...

Hi everyone, this post is about ethernet in the core. Yes, it still covering GE/10GE standards and doesn't include 40/100GE. I expect, ...

Ok, let's talk about IP over DWDM. This post includes: Optical channel payload unit (OPU) Optical channel data unit (ODU) Op...