Fire Codes vs Fire Alarms

Terry Slattery
Principal Architect

One of the neat things about talking with VCs is meeting really smart people. During one of our meetings we were talking with Mike O’Dell, a long-time friend and associate who is one of the smartest people I know. We were describing what NetMRI did (identify network devices, collect data from them, then analyze the data and identify exceptions to industry best practices and identify operational problems in the network).

After much discussion, he finally leaned back in his chair (Mike’s body language signaling understanding of some import) and stated something like:

“I get it now! You’re like network fire codes vs fire alarms. Identify potential problems before there’s a fire.”

We then continued the discussion on how fire codes help prevent fires by identifying best practices that avoid problem scenarios. For example, improper electrical wiring causing a fire, or too many people in a room making it impossible to evacuate them in a safe and timely manner in case of a fire.

I’ve used that analogy since then and people understand it. I’ve always wanted a network management system that would automatically collect the data I knew need to be collected and analyze it the way senior network engineers do, much like fire code inspectors check buildings for fire hazards.

The system I specified would identify potential problems that create or contribute to network outages and poor performance if not rectified. After looking around at existing products in late 2002, I decided that since it still didn’t exist, I’d try my hand at building one. As a result, NetMRI looks at several categories of problems:

  1. incorrect or incomplete network configuration and device configuration (redundancy configured in a device, but no backup device exists);
  2. improper deployment (device configurations that don’t match the corporate policies and configuration templates);
  3. operational problems (duplex mismatch on an important server interface or dropped packets in VoIP calls).
  4. filter megabytes of syslog data to identify important events as they happen (device/interface down events, important routing protocol events, or environmental notifications like an over-temperature situation).

I’m interested in any comments you have regarding the fire codes analogy and the types of analysis that you’ve always wanted out of a network analysis tool.



Re-posted with Permission 

NetCraftsmen would like to acknowledge Infoblox for their permission to re-post this article which originally appeared in the Applied Infrastructure blog under


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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.