Lately I have done some studying for the CCDE and one of the things I was looking at is how to protect against DDoS attacks. I’m not expecting it to be a big topic for the CCDE but it has
Ethernet, STP, Topology change and the behaviour of Ethernet
Introduction This post is inspired by a post at IEOC about Uplinkfast and TCN which can be found here. Before we get to those parts, let’s recap how Ethernet and STP work together. Spanning Tree The Spanning Tree Algorithm builds
Cisco now #1 on bladeservers in US with the Cisco UCS
Five years ago, Cisco started out on their journey to get in on the server market. Very few people believed that Cisco would get a big share of the market. Today, just five years later we are reached by the
A Short Update on CML from #CLUS
Hey everyone, I’ve been having a really good time here at Cisco Live US. Here is a short update on CML. General Info CML is being released end of June or beginning of July. The corporate edition with a base
OSPF – Non Broadcast and Point to Multipoint
Introduction There was a discussion on a forum about the point to multipoint network type in OSPF. What is the purpose of it and why are /32 endpoints advertised? To understand the solution we must first understand the problem. This
CCIE recertified for another 2 years
I passed the 350-001 yesterday which is the CCIE RS v4 written exam. I used the following materials to study for the exam: CCIE RS certification guide CCIE RS quick reference Cisco configuration guides Cisco support forums doc on EEM
Borrowing Credits When Using Shaper on Cisco IOS
Introduction When using a shaper on IOS, the shaper allows a deficit to be created, borrowing future credits. It’s common knowledge that a shaper queues or buffers packets but it’s not common knowledge that the shaper allows a deficit to
My Cisco Live 2014 US schedule
I’m going to my first Cisco Live! And it’s in the US! I have booked my sessions which was a challenge. There are so man good sessions to choose from. I tried to get a balance of sessions I have
Why fast IGP timers aren’t always beneficial
Introduction When tuning your IGP of choice, the first thing people look at is usually the hello and dead interval. This is a flawed logic, it is true that it can help in certain cases but convergence consists of much
Cisco Live Customer Appreciation Event
This year Cisco is celebrating its 25th CAE. It will be hosted at the home of the World Series Champions – The San Francisco Giants. AT&T Ballpark is hosting the event. The artists playing will be Lenny Kravitz and Imagine