I wanted to update this blog that I have put off studying to take care of myself physically, as I have been going from Work laptop -> Study laptop -> Bed -> Work Laptop, and it started to take a toll on my physical well being so I decided to take a much needed break. … Continue reading SWITCH exam postponed until I have time to dedicate to covering material and going for the Pass!
I was hoping I wouldn't have to post this, but a life event has prevented me from studying / publishing new content for the last month, and I will be unable to for the foreseeable future at this point, however the CCNP Grind is not over until all 3 exams have been passed and painfully … Continue reading OOO, will be back to the Grind ASAP!
Have had a minor surgery yesterday, Monday 10/9, and will be out for an undetermined amount of time during recovery from said minor surgery - Be back ASAP! ***Update 12/10/2017*** I have long since been back reviewing and updating my SWITCH articles, as I found a bit to be confusing after coming back, so I've … Continue reading Out Of Office after a minor surgery – Back to the grind ASAP!
This is the new Topology, nothing fancy or colorful yet, but we shall get there! So after configuring R1 and R2, I figured with a flat network without VLAN's or anything I'd just be able to ping 10.0.0.1 from R2, but it timed out. It took me a moment, and fortunately just a moment to … Continue reading New SWITCH Topology, MAC Table aging-timer, and behaviors of moving cables between ports
Lets start from the verrrrry beginning of Switching time, when Dinosaurs roamed the internet. First came the Hub (and Bridge) that acted as one single Collision and Broadcast domain, so all nodes on the network used essentially a shared medium, which was made possible by something called CSMA/CD. What is CSMA/CD? I'm glad you asked. … Continue reading Switching Frame Decision – To Filter, Flood, or Forward as the MAC table is built, and a brief look at Layer 2 history!
After my 3550 decided it was time to die right as I began my SWITCH, I took the opportunity to slack off from studying a bit more, but it's about time to get back at it. I have 3 x 3750v2 running IOS 15 and on the bottom a 3650 running IOS 12.2, which can … Continue reading The almost completely new SWITCH 3750’s 15.x lab setup, and Cisco switch diagram symbols to write to mem!
One again with Keith Bogarts permission he allowed me to post this up for other who do not have his course (which you should go grab a copy of), to demonstrate the differences of Distribute-List's behaviors between protocols. The list speaks for itself, and if you've learned these and forgotten exactly which protocol does what, … Continue reading Keith Bogarts (INE) Comparison chart of how Distribute-List’s work between different protocols!
As I only have two routers in my lab running IOS 15.x, and 12.x is not NTPv4 capable, I've decided to review it between just these two routers to demonstrate new features brought by 15.x code that I couldn't in my previous lab involving the whole WAN Topology. To start there are a quite a … Continue reading NTP: Demonstrated between 2 routers running IOS 15.x to demonstrate NTPv4 Authentication and other concepts! (Edited with more content 5/20/17)
Sticking with this Topology in case I need to lab something for demonstration, it is clear what routers are where. To begin, every router within any given Area should have an identical copy of the LSDB, and that only Type 1 and Type 2 LSA's are flooded only within the Area they originated. The Database … Continue reading OSPF: Database Exchange Process including messages, neighbor states, and all things neighbor forming related!
This will be our topology for most of Review, though I am currently leaving Area 34 and Area 15 out of the equation since we aren't really worried about those for review. You can create a process and an Area by configuring OSPF directly on an interface, rather than making the process and adding the … Continue reading OSPF: Creating OSPF from the interface, playing with Hello / Dead timers, intro to Hello-Multiplier and other good review!
Before we dive into the CCNP material, just a real world note, I see most customers have edge devices with two static routes (one floating for failover with a slightly higher AD) and all corporate traffic has VPN tunnels configured back to the main office servers. So to tie this now back to CCNP related … Continue reading EIGRP: Propagating a default route in EIGRP, the 3 different ways it can be configured, and why / when to use them!
It is very late / early however upon working on the physical lab I realized I completely forgot to cover EIGRP route filtering using Route-Maps to filter EIGRP routes, and I am about half asleep (as usual) so please excuse any typos within 🙂 So to filter routes in EIGRP, we are always going to … Continue reading EIGRP: Using Route-Maps to filter EIGRP routes to finish that discussion, excellent example of Prefix-List logic, test your knowledge!!
Directly from Cisco's website: 1.1 Identify Cisco Express Forwarding concepts 1.1.a FIB - Forwarding Information Base, "sh ip cef" to view, used to determine next hop IP addresses, performs Layer 3 "Packet Switching" or Packet forwarding 1.1.b Adjacency table - Correlates with FIB to find corresponding MAC addresses for Packet Switching / Forwarding Both these … Continue reading ROUTE Blueprint “Network Principles” section topics all covered within this post (briefly, but covered)!
Oh yeah, I went there. We now have another eBGP neighbor to play with some weight configuration with, and see what behaviors occur when working with this Topology so lets dive in! No configurations changes have been made from the previous lab except adding R5 back into the mix, and Peering it to R1 as … Continue reading BGP Weight attribute continuing configuration, how to add weights to single routes instead of “All or none”!
Time for some weight fundamentals to throw out quick, as I am running out of steam, but my goal is to finish the BGP Weight section! So about those fundamentals: The attribute is Cisco Proprietary, not on the list of well known or optional attributes (I imagine because of being Cisco Proprietary) Weight is locally … Continue reading BGP Weight attribute fundamentals, review of iBGP vs eBGP behaviors, and explanation of configuring Weights!