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Cisco Reports Fourth Quarter and Fiscal Year 2019 Earnings

Published on: 2019-08-14

SAN JOSE, Calif., Aug. 14, 2019 -- Cisco today reported fourth quarter and fiscal year results for the period ended July 27, 2019. Cisco reported fourth quarter revenue of $13.4 billion, net income on a generally accepted accounting principles (GAAP) basis of $2.2 billion or $0.51 per share, and ...

Review: 6 slick open source routers

Published on: 2018-02-01

Hackers of the world, unite! You have nothing to lose but the lousy stock firmware your routers shipped with. Apart from smartphones, routers and wireless base stations are undoubtedly the most widely hacked and user-modded consumer devices. In many cases the benefits are major and concrete: a ...

Securing BGP on the host with origin validation

Published on: 2019-09-24

An increasingly popular design for a data centre network is BGP on the host: each host ships with a BGP daemon to advertise the IP addresses it handles and receives the routes to its fellow servers. Compared to a Layer 2-based design, it is very scalable, resilient, cross-vendor and safe (due to ...

DNS resolver centrality

Published on: 2019-09-23

At various times the Internet has been touted as a triumph of the power of open markets and competition. This line of argument says that, unfettered by the often regressive and stultifying hand of government regulation, open markets can react to the needs of consumers. The rigours of a ...

Recommended Networking Resources for September 2019 Second Week

Published on: 2019-09-10

There are so many good resources for Network Engineers out there. I started to share the ones I liked last week. Click here to see September 2019, First Week Networking Recommended Resources. As you know, I will share 5 resource every week. There are so many in my list already, I can’t wait for ...

IT Hero Culture

Published on: 2019-09-06

I’ve written before about rock stars and IT super heroes. We all know or have worked with someone like this in the past. Perhaps we still do have someone in the organization that fits the description. But have you ever stopped to consider how it could be our culture that breeds the very people ...

What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used?

Published on: 2019-09-05

What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used? AIGP stands for Accumulated IGP Metric Attribute which is specified in RFC 7311. IGPs (Interior Gateway Protocols) are designed to run within a single administrative domain and they make path-selection decision based on metric ...

Positioning Policy Properly

Published on: 2019-08-30

Who owns the network policy for your organization? How about the security policy?Identity policy? Sound like easy questions, don’t they? The first two are pretty standard. The last generally comes down to one or two different teams depending upon how much Active Directory you have deployed. But ...

The Tale of the Mysterious Traceroute

Published on: 2019-08-20

If you follow me on Twitter (, you know I have been doing a lot of SD-WAN lately and I recently built my own lab. In this lab, I wanted to try a feature known as service chaining. What is service chaining? It’s a method of sending traffic through one or more ...

Connecting ASA to Umbrella SIG with PBR

Published on: 2019-07-31

This article explores the specific configuration of Cisco ASA when using it to establish a tunnel for Umbrella SIG. The first question many may have is, “What exactly is SIG?” The answer to that is quite simple–SIG is an acronym for Secure Internet Gateway and in the Umbrella implementation it ...

BGP route leak sends European traffic via China

Published on: 2019-06-26

On Thursday June 6, 2019, traffic destined to some of Europe’s biggest mobile providers was misdirected in a roundabout path through the Chinese-government-controlled China Telecom, in some cases for more than two hours. “Swiss data center colocation company AS21217 leaked over 70,000 routes to ...

Cranky Old Network Engineer Complains About The Youth Of Today

Published on: 2019-06-20

If you’re very old (like me) you’ll likely remember the halcyon days when IP routing was not enabled by default on Cisco routers. Younger gamers may find this hard to believe, which makes it even stranger when I keep bumping into an apparently common misconception about how routers work. Let’s ...

StackWise Virtual on Catalyst 9500

Published on: 2019-06-12

During the Cisco Live 2016 in Las Vegas, Cisco presented the new feature named “StackWise virtual” supported by the IOS XE Denali in the 3850 switch series and later, in the new Cisco Catalyst 9500 family. Similarly to the old Virtual Switching System (VSS), the stackwise virtual allows the ...

Migration Strategy: Moving From MPLS/LDP to Segment Routing

Published on: 2019-03-21

MPLS core networks that use Label Distribution Protocol (LDP) are common in SP core networks and have served us well. So, the thought of pulling the guts out of the core is pretty daunting and invites the question why you would want to perform open-heart surgery on such critical infrastructure. ...

SnapRoute - Is there something new happening in networking?

Published on: 2019-03-04

The launch (or relaunch depending on your opinion of when they started and on what they were building verse what they are doing now) of SnapRoute was an interesting event to be able to participate in. SnapRoute presented at Network Field Day 20 as part of the launch of their Cloud Native Network ...

BGP Route Security

Published on: 2018-12-17

Whenever there is a new attack on the Internet that has anything to do with BGP (Border Gateway Protocol), you hear the commonly used phrase that goes something like “BGP is based on the inherent trust model with no inbuilt security”. While that is true (as we will see in this article), what ...

Troubleshoot a DMVPN phase 3 architecture

Published on: 2018-10-09

In the last article, I explained how to configure DMVPN phase3, but what are the most useful commands to troubleshoot this type of network architecture? Five are the main group of commands used to troubleshoot a DMVPN topology: The “show dmvpn” and “show ip nhrp” commands permit to obtain the ...

A Short Summary of Planes

Published on: 2018-08-29

When the CCDE program was first developed, Cisco conveniently broke down the included technologies into five categories: Routing, Tunneling, Quality of Service, Security and Management. Cisco also provided an extensive resource list for the first four topics, consisting of RFCs, Cisco Press ...

DMVPN Phase 3: a complete guide

Published on: 2018-07-16

In a previous article, I explained what is and how it works DMVPN technology. In this article you see how to configure DMVPN phase3. This phase allows spokes to build a spoke-to-spoke tunnel and to overcomes the phase2 restriction using NHRP traffic indication messages from the hub to signal to ...

Wireless 2017: What We Wanted Then, and What We Want Today

Published on: 2017-12-15

As a wireless engineer, we study the 802.11 protocol. We read how the standard is written, study how it is supposed to work and yet seem to spend our time fighting why it doesn’t work. Tweaking power, channels, datarates, toggling features and code versions in hope that things functions the way ...

What Drives Change in Enterprise IT

Published on: 2017-08-30

Reason For Change in Enterprise IT: Obsolescence You may love your Catalyst 6500 with SUP32 supervisors. They still meet all the requirements of your network: gigabit to the user, routing protocols, security capabilities. Unfortunately, Cisco has made it clear that they no longer want to support ...

L3 fabric DC -The underlay Network (BGP) -part2

Published on: 2017-01-17

In the previous post, we laid the foundation of L3 fabric DC In this post we will discuss the underlay network which mainly provide IP reachability plus ECMP capability, here BGP would play a role in your DC next to the 3 other that we discussed one of the previous posts. For the sake of ...

L3 fabric DC -The underlay Network -Part1

Published on: 2016-12-07

In the previous posts we have discussed the classic DC designs and the M-LAG solution. In this post we will cover the basic L3 fabric DC, you might never heard of it or you think that’s a solution for massive scale DC, yes the massive DC in the world would be running L3 fabric but nowadays more ...

The Overlay Problem: Getting In and Out

Published on: 2016-09-30

I've been researching overlay network strategies recently. There are plenty of competing implementations available, employing various encapsulations and control plane designs. But every design I've encountered seems ultimately hampered by the same issue: scalability at the edge. Imagine a ...

GoBGP – A Control Plane Evolving Software Networking

Published on: 2016-03-29

If I have talked to you over the past year or two about networking, odds are I have mentioned a project to you called GoBGP. If we have spoken a lot, you are probably sick of me talking to you about GoBGP There is a reason, it’s because GoBGP is a missing link in networking that has been for a ...

Configuring Macvlan and Ipvlan Linux Networking

Published on: 2016-03-28

Macvlan and Ipvlan are both Linux type networking interfaces that are both supported by the Linux kernel. They are unique for a few different reasons. One thing that makes them both very attractive is they do not use bridges in their implementation and natively namespace aware. It solves some ...

Time to Ditch the Definition of SDN

Published on: 2015-08-16

While at a stoplight looking at the random news feeds on Linkedin I ran across a post of a recent blog post by the ONF and the subsequent conversation where my friend Ivan Pepenlnjak commented. So I threw in my two cents and quickly regretted it because Linkedin has an amazing ability to ...

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