Dear Reader, It’s been a long time since we’ve connected; unfortunately, I haven’t been able to post here as much as I’d have liked over the past 2–4 years. I had plans—for example, to write the usual Techtorial/ITBN experience reports, network security case studies, and even some documentation of my CCIE Service Provider preparation. Sadly, none of that happened—and I won’t be catching up. What’s in the past is already gone. In exchange, there are now plenty of exciting areas worth exploring, especially for those interested in networking. For example, the rise of AI in network monitoring and management systems, or “new,” paradigm-shifting solutions like segment routing. Currently, my main focus is on the CCIE exam and its successful outcome, so I’ll soon write a brief experience report about Segment Routing and other related innovations, such as FlexAlgo, PCE, or NetConf/NSO and similar technologies—which, while they may not fundamentally change the traditional MPLS/BG...

  Kedves Olvasó, Nagyon rég volt szerencsénk egymáshoz, hiszen az elmúlt 2-3-4 évben sajnos nem tudtam ezen platformon kellő számban megjelenni. Pedig terveim voltak, olyanok például, hogy a szokásos Techtorial / ITBN és egyéb élménybeszámoló, illetve hálózat biztonsági esettanulmányok mellett a CCIE Service Provider felkészülésemről is írok némi dokumentációt... Sajnos ezek mind-mind elmaradtak és nem is fogom pótolni, mert ami a múlt, az már elmúlt.   Cserébe van sok-sok izgalmas terület, amivel érdemes és kell is foglalkozni azok számára, akik hálózati terület iránt érdeklődnek. Ilyen például az AI fejlődése a hálózat monitorozó vagy menedzselő rendszerek esetén, vagy olyan "új" paradigmaváltó megoldások mint a segment routing...   Mivel, most számomra aktualitás éppen a CCIE vizsga és annak pozitívan könyvelhető eredménye, ezért élménybeszámoló jelleggel írhatok majd egy kis szösszenetet a Segment Routing megoldásokról és ahhoz kapcsolható egyéb "újdonságokról",...

 Is it the last post about OSPF?   I hope this is the last main topic post of OSFP, but many functionalities have not been talked about, so OSPF parts should be in the future post like sham-link , opaque LSA and soon on.   Why OSPF authentication is important?   Why should service providers use IGP authentication?   As I mentioned in my other post IGP is one of a most important thing in a service provider life. IGP is the responsible of the backbone IP network control plane. If a bad face guy can access for the SP's infrastructure...    ... And here the post ended, because I have no time to serve my readers....    Life is hard, you have to prioritize your tasks... I would have liked to write these post, but everyday life is more important, than this hobby.   May I will write about my exam preparation... or the next post can be a report about the experience...   At this this time, that's all folks...        

 OSPF again  Why OSPF is such important? Why do I care for this topic so much time?   Interesting questions, I do not really know. When I start to process a topic for my exam preparation I do not know how much time I have to learn it. But when I learn it, I feel the importance of the subject area.     If you would like to read more detailed information about OSPF I suggest that link: https://www.ciscopress.com/articles/article.asp?p=2294214&seqNum=4   So let me explain to you that what are the differences between OSPFv2 and OSPFv3? In a high level view the two protocols are only different in the Internet Protocol version support. OSPFv2 is only support IPv4. OSPFv3 support both AFs (address family), but If you wanna know some detail about the other differences you need research better this topic. 1. Network types In OSPFv2 there is 5 network type which is the same in OSPFv3 broadcast non broadcast point-to-point point-to-multipoint point-to-multipoint ...

Hello there! I can not leave the OSPF subject because  it is too beautiful to abandon it. In this post I try to demonstrate how the LSAs work in different OSPF scenarios. In the last post I wrote what is the LSAs, which network type is available, and which router types are exist in an OSPF network. But I do not described these things. On this post I try to define these topics better.  To understand that LSAs how can be flooded on different areas you need to understand the area types. As I mentioned before, there is 5 type of area exist of OSPF. Basically in a backbone/regular area the following LSA types will be flooded: Type 1 Router LSA Type 2 Network LSA Type 3 ABR Summary LSA - if ABR exist in the area. Type 4 ASBR Network LSA - if ASBR exist in the area. Type 5 ASBR Summary LSA - if ASBR exist in the area.  Backbone area is special, because it is responsible for the other area can be connected each other. And what about stub area? Stub types of areas help us to redu...