Another great motivational video
Just wanted to share another great motivational video
Recertified & Plan
I have recertified by doing the SP written exam.
Took me a while, but now its done.
My plan is to hit the labs, starting with Narbik’s SP workbook, working my way through that one. That should keep me occupied for quite a while.
Class Based Tunnel Selection
In this post i would like to demonstrate the Class-Based Tunnel Selection feature.
In class-based tunnel selection, we will select an MPLS TE tunnel based on the incomming Precedence bit in the data.
For example, IP Prec 5 goes to TE Tunnel 1, whereas IP Prec 3 goes to TE Tunnel 2.
Node protection using MPLS-TE Fast ReRoute
In this post i would like to demonstrate the concept of a well known MPLS TE (Traffic Engineering) feature, known as Fast Reroute.
Fast Reroute, as the name implies, is used to create an MPLS network, that has similar convergence properties of SONET/SDH APS of about 50 ms.
The saga will continue
Sorry for the lack of contents lately.
I am dealing with some personal issues that put a bit of a pause to my studies.
As soon as I’m fit for it I will put up some stuff related to the SP space.
Why setting goals does matter.
Today I came across a blog post from a guy which I respect deeply. However, I disagree wholeheartedly with the content in the post.
The title says: “That Setting Yourself Goals is Practising Failure” and the entire post can be found here.
Apologize for the down-time
I apologize for the recent down-time.
My provider had a glitch which is hopefully fixed now.
ASDM “Unconnected Sockets Not Implemented” Error
I ran into this error today on an old ASA and i needed a quick fix that didnt involve downgrading any Java versions from the clients servers.
I can confirm that by using version 6.1(5)51 of the ASDM works correctly (as noted in the link below).
Gold Nugget's, courtesy of Arista
I think the video below is worth going through for a couple of reasons.
First off, it explains one networking company’s strategy towards SDN (Software Defined Networking). Its a great academic concept with lots of potential. However there’s no real push for it from customers (at least the customer base of Arista).
Service Provider emulation of a frame-relay network using MPLS.
One of the cool things about MPLS is its versatility.
In this post i will show how its possible for a service provider to support legacy frame-relay installations without actually having any frame-relay switches.
I will establish an MPLS core and show how a customer with three sites, one hub site and two spoke sites, will never even know that the core is running MPLS and not end-to-end frame-relay.
1st Batch of books.
I have ordered the first batch of books for the CCIE SP track.
Traffic Engineering with MPLS Cisco IOS-XR Fundamentals MPLS-Enabled Applications: Emerging Developments and New Technologies MPLS Configuration on Cisco IOS Software I was hoping that you could get them all as eBooks, but as it turns out, i can get some of them as eBooks through Kindle and some through Cisco Press PDF’s and others i could only get as hard copies.
The cat is out of the bag.
The cat is out of the bag.
I am going for my 2nd CCIE. This time its in the Service Provider track.
For a while i have felt something missing. And what is missing is a clear cut direction on what i want to learn more about in my professional life.
Week on the wire – Week 10.
I think one of the most important things this to happen this week, was a public announcement
from the boss of TeliaSonera.
He announced that they would in the near future, start to charge people for any VoIP calls they would make through their broadband services.
Update on INE's SP track.
There’s news on INE’s Service Provider material.
Updated workbooks for the SPv3 will be arriving “soon”. Hopefully that means within a month or two.
If you are interested, you can read more and even get a peak into a sample lab.
Week on the wire – Week 9.
Its been a rough week. I have been finishing up projects and getting rid of loose ends.
I have also been giving a couple of lectures on IPv6 (Basically primers) to customers as well as some information on basic failover configuration in IOS.
A picture which is worth far more than a 1000 words.
The picture below should be put into a frame and put onto the desk of everyone in the IT industry.
By day, I am a consultant, so I have quite a few stories that relate to this picture.
Obviously the picture shows that, at every step in a project there are misunderstandings.
CAR – The grand-old man in policing.
Below are my findings regarding CAR. Please be advised that this is work in progress.
CAR is the ancient way of doing policing.
It is not configured using any of the new and fancy MQC style configuration.
It is an interface-based command set.
Week on the wire – Week 7.
A couple of things i have found interesting this week.
The first one is that Intel is still in the game for making NIC’s. Even though they are doing some good ones in the server space, this batch seems to be targeted at the entry-level.
Redundancy for small sites.
We are working with alot of customers having lots of small “sites”, meaning that each site range from having 1 to 20 devices. The devices can be a user workstation or it can be some sort of automatic equipment having a VPN tunnel back to the main headquarter.
Cloud enabled task management.
I have been using Things as my task management program for about 5-6 months.
Its been better than not using anything at all, but what has really annoyed me quite heavily is its inability to do “Cloud” synchronization. The only form of synchronization from Things is through your wireless network.
Help the readers out!
I own alot of books.
By books, i mean those paper things, that takes up alot of space and for which we chop down trees.
Recently, i have been shifting my reading onto my iPad. Its easy to carry around, it holds multiple books and pdf files.
Great tips for making changes to your network
I stumbled across this blog post which i think most will find very interesting.
At least i think it contains some ideas that should be followed whenever you make a change to your own or your customers network.
Head on over and take a look: http://lamejournal.
Last post of 2011
This will be the last post of 2011.
It’s been a very interesting year in a lot of different areas.
The most important for me personally has been the achievement of my CCIE. I have worked very hard for this and it finally paid off.
Odd EIGRP behavior
Update: By most examinations, this seems to be a bug. A clever guy at the Cisco support forums might offer the reason why this happens. Thanks to everyone for clearing this up! (https://supportforums.cisco.com/message/3519430) I was trying someting out the other day concerning EIGRP when i ran into an issue i still cant explain, so i would like to put it out there for scrutiny.
Migrating notes – my documents, not the program.
I have finally decided to clean up my Routing & Switching notes and more importantly moving them from Microsoft OneNote to Microsoft Word.
I know, I know, its still Microsoft, but even though OneNote has been okay for my needs, the lack of the program for Mac OS is annoying the crap out of me.
Learning something new each day.
Lately i have been making it a goal of mine to watch a TED video a day.
I do this in order to expand my horizon and learn things that i normally wouldnt pay much attention to.
Something as foreign to me as a music conductor explaining how to perform a piece of music, what it takes and why he does it, makes me a more informed human being.
In this post i will shed some light on some spanning-tree info that has been floating around. But also an explanation why i choose a non-obvious answer to an IPexpert question.
Specifically 2 things.
The first one is the selection of ports and what _exactly_ selects the root port.
Back from trip.
I am back from our company trip to Dubai.
Dubai is a fantastic place. Its my first time in the middle east and it left a great impression.
The whole city struck me as a proof-of-concept kind of city. They decided they wanted to do something great and they went ahead and did it.
Some thoughts on Openflow
It seems that everywhere i look, be it on twitter, google+ or my regular reading list of blogs, Openflow comes up alot.
What is Openflow?
Openflow is an initiative to create a protocol and an API infrastructure to improve overall functionality of your network.
Quick Tip: SPD
One of my friends told me about a feature called SPD and whether i knew about it. I didnt so i decided to read a bit more about it.
SPD stands for Selective Packet Discard. As the name implies it has something to do with discarding packets.
NAT shows its ugly face in the IPv6 world.
Lately theres been some fuzz in the corners about the need for NAT in the new world order of IPv6.
I think its a poor design choice and ill give my reason below.
One of the reasons why people seem to feel like they need NAT, is accessibility to IPv4 only content.
Thoughts on the SSL/TLS – Beast
It seems like every day, there are some vulnerability or crack announced on the geek news-outlets.
For some reason, the recent publication of an exploit of a flaw in the SSL/TLS implementation in some versions, made me extra curious and it made me think a little harder about this whole security business.
Flex Links, otherwise known as the devil for your L2 network.
In all fairness, lets actually figure out what this feature
is used for.
The most important thing you need to know is the fact that
Flex links disable your spanning-tree process.
Great free multicast lecture by INE
I just watched this great lecture from INE on multicast. Well worth sharing:
Lately i have been watching a Ted video each day. I find this fascinating as i learn stuff in areas i would not normally be looking.
I can highly recommend this to anyone in order to stay informed on whats going on in our world.
L2TPv3 – A wormhole through your L3 network.
Using L2 tunnel protocol version 3, you can accomplish what so many scientists are working on. A Wormhole!
Granted, this wormhole is just through your L3 network, so it might not raise as many eyebrows, but its still a nifty tool in your toolbox.
The Verify Source command.
In this small post i want to clarify the use of the “ip verify” command.
There has been some confusion on the usage of this command, especially in conjunction with the access-list parameter. I would like to clarify this here.
Time people.. Time…
Being a network consultant means getting access to lots of customers using a range of different equipment.
One thing thats common for almost all of them, is the fact that the time is not in sync throughout their devices. As you may know, this is a real issue when you are trying to sort out a problem.
Some time has passed.
Some time has passed since i got my CCIE number.
I have spent the time reflecting on the time that has passed since starting my CCIE journey. I will write down my journey in more detail later on for those who are interested.
I am happy to announce that this week i passed the R&S CCIE lab exam. CCIE #29189.
Its been a long journey for me. Working full time, not taking any dedicated time off work to do so, has been challenging.