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Dynamic Multipoint VPN (DMVPN) Setup.

Since DMVPN has been added to the CCIE v5 BluePrint (http://www.cisco.com/web/learning/exams/docs/ccieRS_Lab5.pdf) I figured that now was just as good of a time as any to write this blog.

DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks.

DMVPN is combination of the following technologies:

  • Multipoint GRE (mGRE)
  • Next-Hop Resolution Protocol (NHRP)
  • Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP)
  • Dynamic IPsec encryption
  • Cisco Express Forwarding (CEF)

Topology that we will be starting with:

Colby's Blog Image 1

First thing will be to complete the base configurations on R1, R2 & R3. This will consist of configuring the IP addresses on the above interfaces and setting up the routing protocol to distribute the routes. In this case we will use EIGRP 123. Read More »

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Summary: If you bundle it, they will come!

Recently I was speaking to someone (Mike from New Jersey) at Cisco Live and they were raving about their journey to the Flexpod. They were seeking the best compute, networking and storage yet didn’t want to be boggled down with details when it came to the purchasing process. Converged systems like this are relatively new, and honestly when I was an IT pro; we didn’t have options like that! Not to make me sound old, but when Mike and I were talking about this approach I had a few questions.

Read the rest of Rick’s article, If you bundle it, they will come!, on the Data Center and Cloud blog.

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Summary: Decoding UCS Invicta – Part 3

In part one of this series we covered the internals of HDDs, in part two we went over the internals of SSD, In part three we continue reviewing storage concepts to refresh or learn the right lingo.

Lets start by understanding “Redundant Array of Independent Disks” (RAID). There are RAID levels like RAID0 and RAID1 that are easily to understand and others like RAID5 and RAID6, which many sysadmins misunderstand.

Read the full article, Decoding UCS Invicta – Part 3, on the Data Center and Cloud blog.

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ACI—Some lesser known features

I am a consultant at a Cisco partner and I get to see a lot of different networks. Most of the networks are Cisco, but there are a few that are not. From time to time, I get network assessment projects. I love these types of projects as they are an exploration of  uncharted networks to see what can be discovered. Personally I like to have my network consistent, orderly, and precise. The common components of the configurations on all device should be identical. These network assessments usually do not conform to these standards. Syslog configured on some devices pointing to a device that no longer Read More »

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The other side of the jack: Is your Enterprise Network enterprise ready?

“Give me the best servers you have”, they said.

“Give me the best computers you have”, they said.

“Give me more mobile devices”, they said.

“Give me the network required to use all these things”, they (almost) never said.

The enterprise network is still very much considered to be just that hole in the wall next to the electricity outlet. It used to be that you came to work and moved the mouse to wake the computer. Later you plugged your laptop into that other weird looking jack labeled Read More »

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