Why 1000 hours?

“If you do not change direction, you may end up where you are heading”
― Siddhārtha Gautama

Converging is a very interesting concept, it means that everybody agrees and there is silence. Everybody is synchronized, until the next event or failure. Happy times.

Continue reading “Why 1000 hours?”


MSTP: A standard based STP flavor, just in time for summer


If you understood RPVST+ good enough, then for MSTP you have 50% of the homework done. It uses most of the concepts and improvements from RPVSTP+.

Furthermore, the content of the BPDU exchange in MSTP share many characteristics with RPVSTP+, like the port role that it is included in the Hellos.

Let’s dig deep into MSTP with some drawings!

Continue reading “MSTP: A standard based STP flavor, just in time for summer”

CCIE study report #4 March 2021

“If you want something new, you have to stop doing something old”
― Peter Drucker

March thoughts:

March was a month of many changes, total hours number for the month according to my excel counter is 124h which means that I was able to reach 30h a week of study.

I guess is related with a motivation boost or adrenaline boost after a not so productive February month.

My job is starting to be demanding again, dragging my mental resources and stamina for my after-work study times. Several work projects are coming into my daily job, related with huge building hardware expansions and very soon a datacenter project to help to decide how to migrate hardware to a different location.

Continue reading “CCIE study report #4 March 2021”

CCIE study report #3 February

“If you fell down yesterday, stand up today.”
H.G. Wells

February thoughts

February was not my best month so far, my total study hours for this month are under 100h; 96 hours exactly.

During the 2nd week of February I faced total mental breakdown, where I didn’t want to do anything. Literally. I studied 4h for the whole week.

Continue reading “CCIE study report #3 February”

OSPF part 1: Introduction to your best new friend.

First steps with OSPFv2(it uses IPv4)

In a world dominated by distance vectors, a rebel protocol came into play: OSPF, which is a link-state protocol. It came to change the rules of the game.

Interview question: “What’s is a link-state protocol and how it is different from a distance vector?”

Continue reading “OSPF part 1: Introduction to your best new friend.”

BGP filtering methods: Who turned off the lights?


BGP filtering is a topic that is not well understood, especially when we are talking about route-map logic. In this homemade scenario we will discuss different ways to filter prefixes or even a whole AS out of the BGP table.


  1. Initial scenario blueprint
  2. AS-PATH with filter-list in and out
  3. Distribute list with access-list
  4. Route-map logic and examples
  5. Conclusion

Continue reading “BGP filtering methods: Who turned off the lights?”

CCIE study report #2 January 2021

“You can’t cross the sea merely by standing and staring at the water.”
Rabindranath Tagore

January thoughts

I came back to work in the first week of Jan, so the working time let me little time to study compared with December 2020 when I had many days off.

My excel tracker file accounts for 114 hours of study during January, being the 3rd week the weakest with only 23h of study. Getting more than 100h per month is a good measure that I have a chance to pass my exam next year.

Continue reading “CCIE study report #2 January 2021”