Good Links, 10/14/2013

Peter Welcher
Architect, Operations Technical Advisor

This blog is about Good Links I’ve come across recently, as of 10/14/2013. Admittedly, some are older links, in some cases ones I already knew about. Topics include FabricPath, OTV, ASA Cluster on Nexus, VPC, VXLAN, DFA (Dynamic Fabric Automation), ACI (Application Centric Infrastructure), and VMware/Nicira NSX.

For VXLAN, I’m providing links to a lot of good content by Ivan Pepelnjak ( That should get you a solid start on how VXLAN works.

Cisco Support Community

The following are up on the Cisco Support Community pages. They are PowerPoint, sometimes with rather a lot of (literal) fine print. But all Good Stuff!

Quick Start Guide::FabricPath
Quick Start Guide::Overlay Transport Virtualization (OTV)
Quick Start Guide::ASA Cluster on Nexus
Quick Start Guide::Virtual Port Channel (vPC)


If you don’t know about VXLAN, it is a tunneling L2 over L3 technology introduced by VMware and Cisco a while ago. The 1000v supports it, as does the more NSX product from VMware (see below).

Multicast VXLAN in 1000v
Unicast VXLAN in 1000v
b_VXLAN_Configuration_4_2_1SV_2_2_1.html blog on 1000v unicast VXLAN
VXLAN Scalability (
VXLAN Gateway Design (
VXLAN is not a Datacenter Interconnect Technologhy


Dynamic Fabric Automation

For what it’s worth, I keep looking for more content about DFA (Dynamic Fabric Automation), announced at CiscoLive 2013. There’s not a lot of content on the Cisco web page nor blogs about it. (I’ve been watching, for more specifics, not finding them.)  Greg Ferro did write a blog with more information than I’m finding elsewhere: See also BRKDCT-2385 from CiscoLive 2013 Orlando, if  you have access. This and some other things I’ve seen do seem to be strongly suggesting that spine-and-leaf CLOS tree topology is the way to go in Cisco device-based datacenters. Assuming you will want automation. What’s in print leaves DFA rather vague (is it real, yet?), and some blogs suggest it is tied to Application Centric Infrastructure (see the next topic).

Application Centric Infrastructure

I suspect we’re going to be hearing a lot more about Application Centric Infrastructure (ACI). Probably tied to the upcoming Insieme announcement.

Recently, ACI activity is picking up . Reading the tea leaves says it may be the acronymn to watch.

VMware / Nicira NSX

NSX recently has gotten a lot of attention, due to all the splash about it at VMworld 2013. There are a lot of blogs and videos about it. The best I’ve found so far are:

Brad Hedlund of VMware at OpenStack
VMware product pages on NSX
Ivan  Pepelnjak, Scott Lowe, Brad Hedlund on NSX


Life Log

I’ve been having fun preparing a CMUG (Cisco Mid-Atlantic User’s Group) presentation. Trying to roll up FabricPath, OTV, 1000v, VXLAN, VMware / Nicira NSX, Automation and SDN, and Datacenter Pain Points. Stir but not shake. What does it all mean for the datacenter?

Twitter: @pjwelcher

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Nick Kelly

Cybersecurity Engineer, Cisco

Nick has over 20 years of experience in Security Operations and Security Sales. He is an avid student of cybersecurity and regularly engages with the Infosec community at events like BSides, RVASec, Derbycon and more. The son of an FBI forensics director, Nick holds a B.S. in Criminal Justice and is one of Cisco’s Fire Jumper Elite members. When he’s not working, he writes cyberpunk and punches aliens on his Playstation.


Virgilio “BONG” dela Cruz Jr.

CCDP, CCNA V, CCNP, Cisco IPS Express Security for AM/EE
Field Solutions Architect, Tech Data

Virgilio “Bong” has sixteen years of professional experience in IT industry from academe, technical and customer support, pre-sales, post sales, project management, training and enablement. He has worked in Cisco Technical Assistance Center (TAC) as a member of the WAN and LAN Switching team. Bong now works for Tech Data as the Field Solutions Architect with a focus on Cisco Security and holds a few Cisco certifications including Fire Jumper Elite.


John Cavanaugh

CCIE #1066, CCDE #20070002, CCAr
Chief Technology Officer, Practice Lead Security Services, NetCraftsmen

John is our CTO and the practice lead for a talented team of consultants focused on designing and delivering scalable and secure infrastructure solutions to customers across multiple industry verticals and technologies. Previously he has held several positions including Executive Director/Chief Architect for Global Network Services at JPMorgan Chase. In that capacity, he led a team managing network architecture and services.  Prior to his role at JPMorgan Chase, John was a Distinguished Engineer at Cisco working across a number of verticals including Higher Education, Finance, Retail, Government, and Health Care.

He is an expert in working with groups to identify business needs, and align technology strategies to enable business strategies, building in agility and scalability to allow for future changes. John is experienced in the architecture and design of highly available, secure, network infrastructure and data centers, and has worked on projects worldwide. He has worked in both the business and regulatory environments for the design and deployment of complex IT infrastructures.