Fundamentals of Border Gateway Protocol (BGP) - Part 3

ccie r/s ccna r/s ccnp r/s Apr 08, 2019

This post is the 3rd in a series of Border Gateway Protocol (BGP) posts. If you missed either of the first two, here are the links:

Now, in this post, you'll learn about how BGP neighborships are formed, within an autonomous system, between autonomous systems, and even between routers that are not directly connected. Also, we'll check out BGP authentication.

eBGP Peerings

Given that BGP is an AS-to-AS routing protocol, it would make good sense that external BGP (i.e. eBGP) is a key ingredient in its operations. The very first thing that we need to keep in mind with eBGP is that the standards are built so that there is a requirement for a direct connection. This is something that we can work around (of course), but this point is worth consideration. Because a direct connection is assumed, the BGP protocol does two things:

  • It's going to check for a time-to-live (TTL) value, and that the...
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Fundamentals of Border Gateway Protocol (BGP) - Part 2

ccie r/s ccna r/s ccnp r/s Mar 12, 2019

Part 1 of our blog series on Border Gateway Protocol (BGP) gave you an overview of  BGP and then delved into BGP message types and neighbor states. Now, in this post, you'll learn about one of the most challenging aspects of BGP, how it makes its path selection decision. While routing protocols such as RIP, OSPF, and EIGRP each have their own metrics used to pick the "best" path to a destination network, BGP uses a collection of path attributes (PAs).

BGP Path Attributes

When your BGP speaker receives a BGP prefix, there are going to be many path attributes tagged to it, and we know that these are going to be critical when it comes to BGP doing things like choosing a very best path to a destination. Interestingly, not all of these path attributes are created equal.

All BGP path attributes fall into one of four main categories. Note that this list also provides example attributes in each category. Do not be too concerned with these specific attribute values now, as you will...

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Fundamentals of Border Gateway Protocol (BGP) - Part 1

ccie r/s ccna r/s ccnp r/s Jan 29, 2019

One of the most intimidating topics for Cisco certification candidates in the Route/Switch track is Border Gateway Protocol (BGP). To help remove the FUD (Fear, Uncertainty, and Doubt) surrounding BGP, I'll be sharing a series of blog posts with you to help demystify this routing protocol. In this first post of the series, you'll be introduced to the very basics of BGP and learn about its various message types and states.

An Overview of BGP

Let’s face it - Border Gateway Protocol is just incredibly unique, especially when we compare it to other routing protocols. The very first thing that makes BGP so unique, is what it does for us. It is our only Exterior Gateway Protocol (EGP) in major use today. We know we have our Interior Gateway Protocols (IGPs), and that would be like OSPF running inside of an autonomous system. But BGP is an EGP, which means that it is (usually) going to take prefixes that are inside an autonomous system and send those to other autonomous systems....

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Interview with Network Chuck

 

I recently returned from the Cisco Live US 2018 event in Orlando, Florida. It was a great experience, with lots of conversations, sessions, and insight. You can expect more content about what I learned over the coming weeks.

But for now, I'd love for you to checkout an interview I did with Network Chuck. If you're not familiar with Network Chuck, you're in for a treat. He's an instructor at CBT Nuggets, but I've been a fan of his YouTube channel well before that. His enthusiasm for all things IT is contagious, and I'm sure you'll get some valuable insight from him in this interview.

If you'd like to follow Chuck on any of his social media channels, here are his links:

Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945

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Wireless LAN Security

ccna r/s network plus Apr 06, 2018
 

In this new video, you'll learn the need for wireless LAN (WLAN) security, along with multiple approaches and protocols for better securing your wireless LANs.

Topics include:

  • War Driving
  • MAC Filtering
  • Geofencing
  • Wired Equivalent Privacy (WEP)
  • Initialization Vector (IV)
  • RC4 Encryption
  • Pre-Shared Key (PSK) Mode
  • Enterprise Mode
  • IEEE 802.1X
  • Temporal Key Integrity Protocol (TKIP)
  • Message Integrity Check (MIC)
  • Advanced Encryption Standard (AES)
  • Counter Mode with Cipher Block Chaining Message Authentication Code (CCMP)
  • Wi-Fi Protected Access (WPA)
  • WPA2
  • WPA3
  • Extensible Authentication Protocol (EAP)
  • EAP-TLS
  • EAP-FAST
  • PEAP

This video is a sample from Kevin's new CompTIA Network+ (N10-007) Complete Video Course. To save 50% on your purchase of the video course, use the Coupon Code WALLACE50 during checkout HERE.

Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945

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Configuring QoS with Cisco's Intent-Based Networking

career success ccna r/s Jan 09, 2018

Over the past few months, you might have noticed Cisco’s publicity push regarding intent-based networking. The first time I saw this new brand messaging was at the Las Vegas McCarran International Airport, when I arrived for Cisco Live 2017. Walking up and down the Vegas strip, there it was again, larger than life on the Cosmopolitan Hotel's sign.

Then, once attending Cisco Live, I repeatedly heard the message and the promise of intent-based networking. That’s the focus of this blog post: what is intent-based networking, and how can it make your life easier. Even though intent-based networking can ease the configuration of multiple features, to provide a tangible example, this blog post focuses on how it can be used for quality of service (QoS) configuration.

At a high level, intent-based networking is the idea that you can easily communicate to your network the behavior you wish to be carried out in the network, without the need to know the underlying command line...

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Fundamentals of QoS

 

Last week (on Cyber Monday), I did a webinar covering the theory and configuration of multiple QoS mechanisms. Here's what you'll learn in this replay of that webinar:

  • Learn QoS Mechanisms
  • Understand QoS Markings
  • Demystify Weighted RED
  • Select Appropriate Queuing
  • Explain the "Token Bucket"
  • Configure QoS Using MQC

Enjoy the webinar replay!

Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945

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5 SDN Concepts You've Gotta Know

ccie r/s ccna r/s ccnp r/s Nov 28, 2017
 

I recently did a Facebook Live session covering 5 major Software Defined Networking (SDN) concepts. If you missed the live session, or just want to watch a replay, check out this video.

We cover:

  1. Intro to SDN
  2. Python Installation
  3. Basic Python Programming
  4. Configuring a Router with Python
  5. APIC-EM Applications

BONUS: I'm offering viewers of this video $50 off my Fundamentals of Network Programmability video training series. That means, you only pay $147, as compared to the regular price of $197. To get your $50 discount, click HERE.

Enjoy!

Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945

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Configuring Quality of Service Using MQC

The Need to Know MQC in a World of Automation

These days, Quality of Service (QoS) can be configured relatively easy. If we’re using the APIC-EM as a network controller to manage our routers and switches, we can simply point and click our way through the EasyQoS utility and have a very robust QoS configuration applied to our devices. Even at the command line interface (CLI) of a router a switch, we could invoke the power of AutoQoS VoIP (to optimize QoS settings for voice traffic, or (just on routers) AutoQoS for the Enterprise (to discover network traffic patterns and create a customized QoS configuration to reflect our network’s specific characteristics).

However, what if you need to make an adjustment to such dynamically generated QoS settings? If you examine the underpinnings of any of these QoS automation tools, you’ll see they all use the same approach to configure most (of not all) of their QoS settings. This approach is called Modular QoS CLI, or MQC for...

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Fundamentals of Auto Smartports

ccie r/s ccna r/s ccnp r/s Sep 26, 2017
 

The Auto Smartports feature available on Cisco Catalyst switches allows a port to automatically detect that you’ve attached a device it can recognize (e.g. a Cisco IP Phone, wireless access point, video surveillance camera, etc.)

Then, it runs a macro on that port to apply a "best practice configuration," including QoS, STP, and security settings.

This video introduces you to this exciting feature and gives you a configuration demonstration.

For scaling automatic configurations beyond a single switch, check out Cisco’s Software Defined Networking (SDN) solutions. In fact, you can sign up for my Free SDN Mini-Course by clicking HERE.

Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945

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